<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:40c87f73-fda7-4def-b0e7-4e3187c54ab6,g:c1cce6e2-547c-48f8-a76e-fb513f1c163a-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.bioscrip.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="bios-20251231.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4939c21c-9215-487a-914f-46befe2d46f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_12662747-0f69-478e-a94f-9d82d9258f26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4939c21c-9215-487a-914f-46befe2d46f8" xlink:to="loc_us-gaap_StatementTable_12662747-0f69-478e-a94f-9d82d9258f26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_39df36fb-bfee-48ff-9030-dc9676fc9800" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_12662747-0f69-478e-a94f-9d82d9258f26" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_39df36fb-bfee-48ff-9030-dc9676fc9800" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_39df36fb-bfee-48ff-9030-dc9676fc9800_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_39df36fb-bfee-48ff-9030-dc9676fc9800" xlink:to="loc_us-gaap_EquityComponentDomain_39df36fb-bfee-48ff-9030-dc9676fc9800_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_39df36fb-bfee-48ff-9030-dc9676fc9800" xlink:to="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_61e254fe-d792-4215-8c04-7a12d8c5866e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_PreferredStockMember_61e254fe-d792-4215-8c04-7a12d8c5866e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_cfd6519b-093c-44df-b914-e78323ed9fed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_CommonStockMember_cfd6519b-093c-44df-b914-e78323ed9fed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_3a757c68-51f4-415f-b846-3df9981d4798" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_TreasuryStockCommonMember_3a757c68-51f4-415f-b846-3df9981d4798" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_4ce03346-8c36-4a94-86dc-a25b03a6e2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_4ce03346-8c36-4a94-86dc-a25b03a6e2f5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_d4386eb2-b98f-468b-9083-3cbe5af9edc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_RetainedEarningsMember_d4386eb2-b98f-468b-9083-3cbe5af9edc4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5a8e0bc0-c23d-4b44-a4a9-a50b17217b4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_eb6d28d9-1ef7-49b6-b1d4-605023cafcc4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5a8e0bc0-c23d-4b44-a4a9-a50b17217b4b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4939c21c-9215-487a-914f-46befe2d46f8" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7dc4ab0e-8bd6-4965-9c60-21f212ad6ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_us-gaap_StockholdersEquity_7dc4ab0e-8bd6-4965-9c60-21f212ad6ed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_bee23f09-9f6e-417f-8973-d1c32c24b1fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_bee23f09-9f6e-417f-8973-d1c32c24b1fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_StockIssuedValueRestrictedStockStockOptionsExercisedAndTaxWithholdings_ed7318c9-918d-4bb6-a113-d81abd263c42" xlink:href="bios-20251231.xsd#bios_StockIssuedValueRestrictedStockStockOptionsExercisedAndTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_bios_StockIssuedValueRestrictedStockStockOptionsExercisedAndTaxWithholdings_ed7318c9-918d-4bb6-a113-d81abd263c42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_StockRepurchasedDuringPeriodValueIncludingRelatedTaxEffects_727256c1-2d49-4d08-b787-4a2b6a8b2a4a" xlink:href="bios-20251231.xsd#bios_StockRepurchasedDuringPeriodValueIncludingRelatedTaxEffects"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_bios_StockRepurchasedDuringPeriodValueIncludingRelatedTaxEffects_727256c1-2d49-4d08-b787-4a2b6a8b2a4a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_93c565b3-9607-43c7-b844-3e399a52f9d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_us-gaap_NetIncomeLoss_93c565b3-9607-43c7-b844-3e399a52f9d4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24248967-a1de-4b13-be1c-29ec388aa180" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0079afde-82b5-45d0-bf92-549699a79d9d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24248967-a1de-4b13-be1c-29ec388aa180" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b37eedea-fa56-458b-9c5e-b1f833d8a7df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/NATUREOFOPERATIONSANDPRESENTATIONOFFINANCIALSTATEMENTSDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#NATUREOFOPERATIONSANDPRESENTATIONOFFINANCIALSTATEMENTSDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/NATUREOFOPERATIONSANDPRESENTATIONOFFINANCIALSTATEMENTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e86c072b-e8a7-4c6b-a15d-7851975af7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e86c072b-e8a7-4c6b-a15d-7851975af7a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c3540a53-f608-4de0-84bf-a6a12ba3e7e9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e86c072b-e8a7-4c6b-a15d-7851975af7a5" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c3540a53-f608-4de0-84bf-a6a12ba3e7e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c3540a53-f608-4de0-84bf-a6a12ba3e7e9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c3540a53-f608-4de0-84bf-a6a12ba3e7e9" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c3540a53-f608-4de0-84bf-a6a12ba3e7e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_9e233bd3-c211-4c4c-a36a-aaa9f923c3d8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c3540a53-f608-4de0-84bf-a6a12ba3e7e9" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_9e233bd3-c211-4c4c-a36a-aaa9f923c3d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_LegacyHealthSystemsMember_1680f95b-ee44-44a4-8a9e-03bb62801512" xlink:href="bios-20251231.xsd#bios_LegacyHealthSystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_9e233bd3-c211-4c4c-a36a-aaa9f923c3d8" xlink:to="loc_bios_LegacyHealthSystemsMember_1680f95b-ee44-44a4-8a9e-03bb62801512" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NumberOfServiceLocations_c354c6fc-60a4-4e29-9fd2-a06aafadf730" xlink:href="bios-20251231.xsd#bios_NumberOfServiceLocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_bios_NumberOfServiceLocations_c354c6fc-60a4-4e29-9fd2-a06aafadf730" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NumberOfServiceLocationsIncludingAmbulatoryInfusionSuites_6b715704-c2cd-4b4c-94ab-eda16b8b7be0" xlink:href="bios-20251231.xsd#bios_NumberOfServiceLocationsIncludingAmbulatoryInfusionSuites"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_bios_NumberOfServiceLocationsIncludingAmbulatoryInfusionSuites_6b715704-c2cd-4b4c-94ab-eda16b8b7be0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NumberOfInfusionSites_1cb3ae5a-4713-49c3-b58c-a87c5cf2957d" xlink:href="bios-20251231.xsd#bios_NumberOfInfusionSites"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_bios_NumberOfInfusionSites_1cb3ae5a-4713-49c3-b58c-a87c5cf2957d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NumberOfInfusionSitesIncludingAdvancesPractitionerCapability_887c0725-162b-4859-a65d-a1d855a11667" xlink:href="bios-20251231.xsd#bios_NumberOfInfusionSitesIncludingAdvancesPractitionerCapability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_bios_NumberOfInfusionSitesIncludingAdvancesPractitionerCapability_887c0725-162b-4859-a65d-a1d855a11667" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_51d033a7-2ee2-4f8d-9e50-c8f28e09a261" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_us-gaap_NumberOfOperatingSegments_51d033a7-2ee2-4f8d-9e50-c8f28e09a261" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019bb926-fd50-7fd1-85cc-07d9c80a8426" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_us-gaap_NumberOfReportableSegments_019bb926-fd50-7fd1-85cc-07d9c80a8426" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_5eb7f366-83ef-4f4f-88e0-f902b20fe807" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_68dd8cbe-edc8-4d2b-9981-33a12e74113a" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_5eb7f366-83ef-4f4f-88e0-f902b20fe807" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_12111c85-9330-4b33-a519-e4310c5f3901" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_srt_RangeAxis_12111c85-9330-4b33-a519-e4310c5f3901" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_12111c85-9330-4b33-a519-e4310c5f3901_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_12111c85-9330-4b33-a519-e4310c5f3901" xlink:to="loc_srt_RangeMember_12111c85-9330-4b33-a519-e4310c5f3901_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_43476b2d-1648-4fbc-8b95-842c8f633d78" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_12111c85-9330-4b33-a519-e4310c5f3901" xlink:to="loc_srt_RangeMember_43476b2d-1648-4fbc-8b95-842c8f633d78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6f76a16b-be86-4b90-9560-7738e18f8592" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_43476b2d-1648-4fbc-8b95-842c8f633d78" xlink:to="loc_srt_MinimumMember_6f76a16b-be86-4b90-9560-7738e18f8592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7b0d7c57-0273-4be1-b9b0-e05381613bd3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_43476b2d-1648-4fbc-8b95-842c8f633d78" xlink:to="loc_srt_MaximumMember_7b0d7c57-0273-4be1-b9b0-e05381613bd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6986f9e1-455f-43a6-aaf3-a97bfec115d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6986f9e1-455f-43a6-aaf3-a97bfec115d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6986f9e1-455f-43a6-aaf3-a97bfec115d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6986f9e1-455f-43a6-aaf3-a97bfec115d9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6986f9e1-455f-43a6-aaf3-a97bfec115d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6986f9e1-455f-43a6-aaf3-a97bfec115d9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerListsMember_a5e8d949-051a-41e9-b009-f923174d7fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerListsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:to="loc_us-gaap_CustomerListsMember_a5e8d949-051a-41e9-b009-f923174d7fcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_3954a680-0bd2-4e8c-97c7-7cf6579b578d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_3954a680-0bd2-4e8c-97c7-7cf6579b578d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_d914fd19-0687-45f5-95bd-79b71ff25a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_d914fd19-0687-45f5-95bd-79b71ff25a4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_9551d054-026c-4258-84b7-6cc9afbc3ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2b828fd7-ef73-424b-91f4-f3e688bff377" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_9551d054-026c-4258-84b7-6cc9afbc3ba6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1403285b-49d1-448e-b34c-eb51656143d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1403285b-49d1-448e-b34c-eb51656143d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1403285b-49d1-448e-b34c-eb51656143d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1403285b-49d1-448e-b34c-eb51656143d5" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1403285b-49d1-448e-b34c-eb51656143d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68ebf44f-401c-4dfc-af1c-d477a057435b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1403285b-49d1-448e-b34c-eb51656143d5" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68ebf44f-401c-4dfc-af1c-d477a057435b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_0e7bd255-5fcc-400c-9de2-0f9f0715c255" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68ebf44f-401c-4dfc-af1c-d477a057435b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_0e7bd255-5fcc-400c-9de2-0f9f0715c255" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_AccountsReceivableBenchmarkMember_d7ed4bc1-c518-40b2-90e1-95b24e852315" xlink:href="bios-20251231.xsd#bios_AccountsReceivableBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68ebf44f-401c-4dfc-af1c-d477a057435b" xlink:to="loc_bios_AccountsReceivableBenchmarkMember_d7ed4bc1-c518-40b2-90e1-95b24e852315" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsProductLineMember_fb1956f2-762e-4709-8fc3-872e9818e17c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68ebf44f-401c-4dfc-af1c-d477a057435b" xlink:to="loc_us-gaap_CostOfGoodsProductLineMember_fb1956f2-762e-4709-8fc3-872e9818e17c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_0d5b6048-a91c-4b74-ba71-c1a8f8667f78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_0d5b6048-a91c-4b74-ba71-c1a8f8667f78" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_0d5b6048-a91c-4b74-ba71-c1a8f8667f78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_0d5b6048-a91c-4b74-ba71-c1a8f8667f78" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_0d5b6048-a91c-4b74-ba71-c1a8f8667f78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_1ba0ad01-1697-4820-bb82-1432cf1f5f78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_0d5b6048-a91c-4b74-ba71-c1a8f8667f78" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_1ba0ad01-1697-4820-bb82-1432cf1f5f78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_74adde9d-7094-4d1e-920b-c5f20614d6df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1ba0ad01-1697-4820-bb82-1432cf1f5f78" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_74adde9d-7094-4d1e-920b-c5f20614d6df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentContractsConcentrationRiskMember_98f9c310-ed48-49b5-a14a-0432db8bd60d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentContractsConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1ba0ad01-1697-4820-bb82-1432cf1f5f78" xlink:to="loc_us-gaap_GovernmentContractsConcentrationRiskMember_98f9c310-ed48-49b5-a14a-0432db8bd60d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierConcentrationRiskMember_612f482e-87b8-4d11-adc7-db73a1ada39e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1ba0ad01-1697-4820-bb82-1432cf1f5f78" xlink:to="loc_us-gaap_SupplierConcentrationRiskMember_612f482e-87b8-4d11-adc7-db73a1ada39e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_dfeb1200-cd8c-4c45-82e7-72c15576466a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_srt_MajorCustomersAxis_dfeb1200-cd8c-4c45-82e7-72c15576466a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_dfeb1200-cd8c-4c45-82e7-72c15576466a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_dfeb1200-cd8c-4c45-82e7-72c15576466a" xlink:to="loc_srt_NameOfMajorCustomerDomain_dfeb1200-cd8c-4c45-82e7-72c15576466a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_dd17d843-b95e-4d27-8bd6-313ae9ac538a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_dfeb1200-cd8c-4c45-82e7-72c15576466a" xlink:to="loc_srt_NameOfMajorCustomerDomain_dd17d843-b95e-4d27-8bd6-313ae9ac538a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_LargestPayerMember_098e6d7c-15f0-4b26-8520-ff89df072907" xlink:href="bios-20251231.xsd#bios_LargestPayerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_dd17d843-b95e-4d27-8bd6-313ae9ac538a" xlink:to="loc_bios_LargestPayerMember_098e6d7c-15f0-4b26-8520-ff89df072907" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_35f98a37-7cac-4f3a-aa97-a304b353e622" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_srt_ProductOrServiceAxis_35f98a37-7cac-4f3a-aa97-a304b353e622" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_35f98a37-7cac-4f3a-aa97-a304b353e622_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_35f98a37-7cac-4f3a-aa97-a304b353e622" xlink:to="loc_srt_ProductsAndServicesDomain_35f98a37-7cac-4f3a-aa97-a304b353e622_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_2bbec8be-5dda-4d98-ad39-e36b11b6c547" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_35f98a37-7cac-4f3a-aa97-a304b353e622" xlink:to="loc_srt_ProductsAndServicesDomain_2bbec8be-5dda-4d98-ad39-e36b11b6c547" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_GovernmentHealthcareProgramsMember_2909279a-d618-4589-afeb-b92a1dbe4fb0" xlink:href="bios-20251231.xsd#bios_GovernmentHealthcareProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2bbec8be-5dda-4d98-ad39-e36b11b6c547" xlink:to="loc_bios_GovernmentHealthcareProgramsMember_2909279a-d618-4589-afeb-b92a1dbe4fb0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_0aed444e-1ca7-4e9b-8af5-f93b31b83d14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_0aed444e-1ca7-4e9b-8af5-f93b31b83d14" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_0aed444e-1ca7-4e9b-8af5-f93b31b83d14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_0aed444e-1ca7-4e9b-8af5-f93b31b83d14" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_0aed444e-1ca7-4e9b-8af5-f93b31b83d14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_472b2351-b1e2-449f-9f9c-bcad1195dccf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_0aed444e-1ca7-4e9b-8af5-f93b31b83d14" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_472b2351-b1e2-449f-9f9c-bcad1195dccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FourVendorsMember_01a32f8a-adb5-45e7-b9c1-855f97b50dd3" xlink:href="bios-20251231.xsd#bios_FourVendorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_472b2351-b1e2-449f-9f9c-bcad1195dccf" xlink:to="loc_bios_FourVendorsMember_01a32f8a-adb5-45e7-b9c1-855f97b50dd3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ThreeVendorsMember_019b8484-ff95-7e2e-a914-3036897bd860" xlink:href="bios-20251231.xsd#bios_ThreeVendorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_472b2351-b1e2-449f-9f9c-bcad1195dccf" xlink:to="loc_bios_ThreeVendorsMember_019b8484-ff95-7e2e-a914-3036897bd860" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019aff3b-9956-7cbb-ac99-cac41ad27130" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_a4f49326-c5f8-4583-9dbd-c7c6fb6fe324" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019aff3b-9956-7cbb-ac99-cac41ad27130" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7cbb-ac99-cac41ad27130_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019aff3b-9956-7cbb-ac99-cac41ad27130" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7cbb-ac99-cac41ad27130_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7f0b-b219-f749749fa2f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019aff3b-9956-7cbb-ac99-cac41ad27130" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7f0b-b219-f749749fa2f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_InfusionPumpsMember_2f1fc2cd-346c-4cc4-b031-ee8a167c07b9" xlink:href="bios-20251231.xsd#bios_InfusionPumpsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7f0b-b219-f749749fa2f2" xlink:to="loc_bios_InfusionPumpsMember_2f1fc2cd-346c-4cc4-b031-ee8a167c07b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_689bf1da-365b-4c56-b30b-3897ceb1b1b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019aff3b-9956-7f0b-b219-f749749fa2f2" xlink:to="loc_us-gaap_EquipmentMember_689bf1da-365b-4c56-b30b-3897ceb1b1b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledReceivablesCurrent_27007448-0e43-40f7-ac53-eb12d21de42b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnbilledReceivablesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_27007448-0e43-40f7-ac53-eb12d21de42b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLoss_d896c809-4929-4ddd-9d45-f5e8b0bfbafc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLoss_d896c809-4929-4ddd-9d45-f5e8b0bfbafc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_e0553bc9-d745-477d-99d4-ca09da9833d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_e0553bc9-d745-477d-99d4-ca09da9833d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019aff3a-8f30-7d6a-a796-ba25d058d55e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019aff3a-8f30-7d6a-a796-ba25d058d55e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_837af504-ce59-4950-8a82-397a0a04202a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_EquityMethodInvestments_837af504-ce59-4950-8a82-397a0a04202a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8ca35f5b-f0da-48d7-9094-3e79718ea6ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8ca35f5b-f0da-48d7-9094-3e79718ea6ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_9f1cc795-9110-4f8c-a553-718bbf8a066c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_9f1cc795-9110-4f8c-a553-718bbf8a066c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_2d401398-32fb-4f79-b665-14a139e4d2e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_67e218dd-c543-4315-a733-eb58b0efe936" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_2d401398-32fb-4f79-b665-14a139e4d2e5" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/BUSINESSACQUISITIONSAdditionalInformationDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#BUSINESSACQUISITIONSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/BUSINESSACQUISITIONSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f3694d11-0099-4a54-a7cb-4075b3a75822" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f3694d11-0099-4a54-a7cb-4075b3a75822" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_91726043-1af6-4a2b-9b3e-3037cba74bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f3694d11-0099-4a54-a7cb-4075b3a75822" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_91726043-1af6-4a2b-9b3e-3037cba74bd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_91726043-1af6-4a2b-9b3e-3037cba74bd2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_91726043-1af6-4a2b-9b3e-3037cba74bd2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_91726043-1af6-4a2b-9b3e-3037cba74bd2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_831f3b3e-b042-4946-9d3f-5e4868ef1310" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_91726043-1af6-4a2b-9b3e-3037cba74bd2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_831f3b3e-b042-4946-9d3f-5e4868ef1310" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_IntramedPlusIncMember_f01642c9-182e-4d48-86e2-163b92b0c5c6" xlink:href="bios-20251231.xsd#bios_IntramedPlusIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_831f3b3e-b042-4946-9d3f-5e4868ef1310" xlink:to="loc_bios_IntramedPlusIncMember_f01642c9-182e-4d48-86e2-163b92b0c5c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_AmedisysIncMember_5ee640e6-6a0c-481d-9e6c-29adb0cd5c82" xlink:href="bios-20251231.xsd#bios_AmedisysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_831f3b3e-b042-4946-9d3f-5e4868ef1310" xlink:to="loc_bios_AmedisysIncMember_5ee640e6-6a0c-481d-9e6c-29adb0cd5c82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_RevitalizedLLCMember_bfdfafc1-5b0d-4dbd-8152-9f6f8d56c6a8" xlink:href="bios-20251231.xsd#bios_RevitalizedLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_831f3b3e-b042-4946-9d3f-5e4868ef1310" xlink:to="loc_bios_RevitalizedLLCMember_bfdfafc1-5b0d-4dbd-8152-9f6f8d56c6a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_9341e1ec-667a-488c-9235-889245d73a8b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f3694d11-0099-4a54-a7cb-4075b3a75822" xlink:to="loc_srt_OwnershipAxis_9341e1ec-667a-488c-9235-889245d73a8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_9341e1ec-667a-488c-9235-889245d73a8b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_9341e1ec-667a-488c-9235-889245d73a8b" xlink:to="loc_srt_OwnershipDomain_9341e1ec-667a-488c-9235-889245d73a8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_6f3b2e96-00bf-4569-919f-24c898b4c96e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_9341e1ec-667a-488c-9235-889245d73a8b" xlink:to="loc_srt_OwnershipDomain_6f3b2e96-00bf-4569-919f-24c898b4c96e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionCareCombinedCompanyMember_5a4986d4-2712-49e1-a38f-aee6aa767b64" xlink:href="bios-20251231.xsd#bios_OptionCareCombinedCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_6f3b2e96-00bf-4569-919f-24c898b4c96e" xlink:to="loc_bios_OptionCareCombinedCompanyMember_5a4986d4-2712-49e1-a38f-aee6aa767b64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_042f952b-a304-4438-9bef-001dbafa95c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_042f952b-a304-4438-9bef-001dbafa95c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_db1ca494-965c-49bb-9189-d967eccd1383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_db1ca494-965c-49bb-9189-d967eccd1383" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_b2e0675d-c8fd-4dd3-95f9-1218321c4fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_b2e0675d-c8fd-4dd3-95f9-1218321c4fc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_BusinessCombinationContingentConsiderationAssetTerminationFee_b480c4a5-6dbb-49a6-862c-a1ccbdf7351c" xlink:href="bios-20251231.xsd#bios_BusinessCombinationContingentConsiderationAssetTerminationFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_bios_BusinessCombinationContingentConsiderationAssetTerminationFee_b480c4a5-6dbb-49a6-862c-a1ccbdf7351c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_8f047f63-1461-4abc-b5bd-81dc4909c83d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_8f047f63-1461-4abc-b5bd-81dc4909c83d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionAcquisitionRelatedCostExpensedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019aff33-9e1e-7680-8846-25cd1a12b511" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionAcquisitionRelatedCostExpensedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_8f047f63-1461-4abc-b5bd-81dc4909c83d" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionAcquisitionRelatedCostExpensedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019aff33-9e1e-7680-8846-25cd1a12b511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_BusinessCombinationConsiderationTransferredNetOfCashAcquired_c35ba6c8-ad2a-49f7-8cc1-1eadf8ac5e34" xlink:href="bios-20251231.xsd#bios_BusinessCombinationConsiderationTransferredNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_bios_BusinessCombinationConsiderationTransferredNetOfCashAcquired_c35ba6c8-ad2a-49f7-8cc1-1eadf8ac5e34" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_31f353f0-3c36-489d-86ed-e08bc0b1114c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_Goodwill_31f353f0-3c36-489d-86ed-e08bc0b1114c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f3ed2600-c099-4800-94a5-e0054b9bd14f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9cfacc91-4c15-4a2b-a21f-02ea9510efc8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f3ed2600-c099-4800-94a5-e0054b9bd14f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/BUSINESSACQUISITIONSScheduleofPreliminaryEstimateoftheAllocationConsiderationTransferredDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#BUSINESSACQUISITIONSScheduleofPreliminaryEstimateoftheAllocationConsiderationTransferredDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/BUSINESSACQUISITIONSScheduleofPreliminaryEstimateoftheAllocationConsiderationTransferredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5cc4fb16-4a77-4ad5-b549-95bf23075ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5cc4fb16-4a77-4ad5-b549-95bf23075ea4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_d72f51bb-40d7-4a1a-8d05-28972a54d5cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5cc4fb16-4a77-4ad5-b549-95bf23075ea4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_d72f51bb-40d7-4a1a-8d05-28972a54d5cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d72f51bb-40d7-4a1a-8d05-28972a54d5cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d72f51bb-40d7-4a1a-8d05-28972a54d5cb" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d72f51bb-40d7-4a1a-8d05-28972a54d5cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_631f8e25-852d-437e-ba81-59c17052a316" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d72f51bb-40d7-4a1a-8d05-28972a54d5cb" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_631f8e25-852d-437e-ba81-59c17052a316" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_IntramedPlusIncMember_9cc49e19-b52c-41fd-89bf-4a3caaf89e46" xlink:href="bios-20251231.xsd#bios_IntramedPlusIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_631f8e25-852d-437e-ba81-59c17052a316" xlink:to="loc_bios_IntramedPlusIncMember_9cc49e19-b52c-41fd-89bf-4a3caaf89e46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_68ad7d11-5c90-4ef8-a052-2d44f87882f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5cc4fb16-4a77-4ad5-b549-95bf23075ea4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_68ad7d11-5c90-4ef8-a052-2d44f87882f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_68ad7d11-5c90-4ef8-a052-2d44f87882f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_68ad7d11-5c90-4ef8-a052-2d44f87882f3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_68ad7d11-5c90-4ef8-a052-2d44f87882f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b42eb36-8846-492c-9a6e-9999a52d969f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_68ad7d11-5c90-4ef8-a052-2d44f87882f3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b42eb36-8846-492c-9a6e-9999a52d969f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ReferralSourcesMember_b767f296-572d-4bf0-b92b-9ab429b55b46" xlink:href="bios-20251231.xsd#bios_ReferralSourcesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b42eb36-8846-492c-9a6e-9999a52d969f" xlink:to="loc_bios_ReferralSourcesMember_b767f296-572d-4bf0-b92b-9ab429b55b46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_124b0667-96d4-4423-9b4f-9f9cd2f35d08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b42eb36-8846-492c-9a6e-9999a52d969f" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_124b0667-96d4-4423-9b4f-9f9cd2f35d08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_0d6965d9-1cce-40bd-92b7-89a27bcacf3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_0d6965d9-1cce-40bd-92b7-89a27bcacf3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e2b973ab-860b-426a-90c7-642eb993b020" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e2b973ab-860b-426a-90c7-642eb993b020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_1c7d4ba1-2d77-46a4-81e5-4aa8e7d7b27d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_1c7d4ba1-2d77-46a4-81e5-4aa8e7d7b27d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_ee0f3520-3136-4c00-94a5-f08bffb89b91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_ee0f3520-3136-4c00-94a5-f08bffb89b91" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherLiabilities_5bf5bc97-0d81-4e95-be3c-bf83135e0533" xlink:href="bios-20251231.xsd#bios_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_bios_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherLiabilities_5bf5bc97-0d81-4e95-be3c-bf83135e0533" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3ae52a47-4513-4f1d-baf9-17b6f2e292b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3ae52a47-4513-4f1d-baf9-17b6f2e292b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_202c01e1-e4d1-43e6-9c8d-53f1e404daa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_Goodwill_202c01e1-e4d1-43e6-9c8d-53f1e404daa9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_0184be93-a12d-4a06-bf4f-fc5689fb00ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_0184be93-a12d-4a06-bf4f-fc5689fb00ed" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_093b3608-eb12-4286-b988-3c3c1bb75e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_093b3608-eb12-4286-b988-3c3c1bb75e3e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_4a76ac24-f6a5-4096-be2d-542c6984b260" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6d4dd9b4-8cda-4998-b535-a725574ee390" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6d4dd9b4-8cda-4998-b535-a725574ee390" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_1d02445b-2a70-4d0b-abba-6ec695d484d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d329ebd2-fe7b-43bf-9af9-83decfce0dbd" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_1d02445b-2a70-4d0b-abba-6ec695d484d6" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/REVENUEScheduleofNetRevenueEarnedbyCategoryofPayerDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#REVENUEScheduleofNetRevenueEarnedbyCategoryofPayerDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/REVENUEScheduleofNetRevenueEarnedbyCategoryofPayerDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_8edf5c17-c1f6-46f9-b712-882e867b17a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_7e5ed76c-d8ed-486c-a37c-ae276398da0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_8edf5c17-c1f6-46f9-b712-882e867b17a7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_7e5ed76c-d8ed-486c-a37c-ae276398da0f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_2c12b939-4c64-40c8-9b39-f22b011ecdd5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_7e5ed76c-d8ed-486c-a37c-ae276398da0f" xlink:to="loc_srt_MajorCustomersAxis_2c12b939-4c64-40c8-9b39-f22b011ecdd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_2c12b939-4c64-40c8-9b39-f22b011ecdd5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_2c12b939-4c64-40c8-9b39-f22b011ecdd5" xlink:to="loc_srt_NameOfMajorCustomerDomain_2c12b939-4c64-40c8-9b39-f22b011ecdd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_b355b1b8-66ca-46c0-9483-4ab775800faf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_2c12b939-4c64-40c8-9b39-f22b011ecdd5" xlink:to="loc_srt_NameOfMajorCustomerDomain_b355b1b8-66ca-46c0-9483-4ab775800faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_CommercialCustomerMember_716dad04-db29-4470-99f9-6be6371bcc55" xlink:href="bios-20251231.xsd#bios_CommercialCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b355b1b8-66ca-46c0-9483-4ab775800faf" xlink:to="loc_bios_CommercialCustomerMember_716dad04-db29-4470-99f9-6be6371bcc55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_GovernmentCustomerMember_e831611c-20f8-40ec-b51f-d9e22f936ddd" xlink:href="bios-20251231.xsd#bios_GovernmentCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b355b1b8-66ca-46c0-9483-4ab775800faf" xlink:to="loc_bios_GovernmentCustomerMember_e831611c-20f8-40ec-b51f-d9e22f936ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_PatientCustomerMember_aea44b1b-d1e6-48df-ae31-422f9012ca3f" xlink:href="bios-20251231.xsd#bios_PatientCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b355b1b8-66ca-46c0-9483-4ab775800faf" xlink:to="loc_bios_PatientCustomerMember_aea44b1b-d1e6-48df-ae31-422f9012ca3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_dc91d8df-10f3-47ff-9389-65c7e61ce711" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_8edf5c17-c1f6-46f9-b712-882e867b17a7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_dc91d8df-10f3-47ff-9389-65c7e61ce711" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/INCOMETAXESNarrativeDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#INCOMETAXESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/INCOMETAXESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_9731c364-45b1-479a-9a12-00c8812c4e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_9731c364-45b1-479a-9a12-00c8812c4e5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_3d3d4e97-59df-49ae-b01d-0b90efffacc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_9731c364-45b1-479a-9a12-00c8812c4e5a" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_3d3d4e97-59df-49ae-b01d-0b90efffacc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_3d3d4e97-59df-49ae-b01d-0b90efffacc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3d3d4e97-59df-49ae-b01d-0b90efffacc4" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_3d3d4e97-59df-49ae-b01d-0b90efffacc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_f605cb79-c0a3-4496-9e37-b14986c34f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3d3d4e97-59df-49ae-b01d-0b90efffacc4" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_f605cb79-c0a3-4496-9e37-b14986c34f8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_d876a745-5ee1-4823-a779-faea3081cb04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_f605cb79-c0a3-4496-9e37-b14986c34f8b" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_d876a745-5ee1-4823-a779-faea3081cb04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_ee5bb192-3655-485a-8ba7-9706f5602b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_f605cb79-c0a3-4496-9e37-b14986c34f8b" xlink:to="loc_us-gaap_DomesticCountryMember_ee5bb192-3655-485a-8ba7-9706f5602b7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_72421a5e-789d-493e-a3cd-c18718c75567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_9731c364-45b1-479a-9a12-00c8812c4e5a" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_72421a5e-789d-493e-a3cd-c18718c75567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_72421a5e-789d-493e-a3cd-c18718c75567_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_72421a5e-789d-493e-a3cd-c18718c75567" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_72421a5e-789d-493e-a3cd-c18718c75567_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_72421a5e-789d-493e-a3cd-c18718c75567" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_MergerOperatingLossCarryforwardMember_74a18af1-4d13-4601-b509-2257d4fd7a86" xlink:href="bios-20251231.xsd#bios_MergerOperatingLossCarryforwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:to="loc_bios_MergerOperatingLossCarryforwardMember_74a18af1-4d13-4601-b509-2257d4fd7a86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_IndefiniteCarryforwardPeriodMember_cc7128b5-ac25-4727-b941-ead05247bf86" xlink:href="bios-20251231.xsd#bios_IndefiniteCarryforwardPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:to="loc_bios_IndefiniteCarryforwardPeriodMember_cc7128b5-ac25-4727-b941-ead05247bf86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_InterestLimitationCarryforwardsMember_9894bfa2-16e3-4196-85ab-6f976f63b070" xlink:href="bios-20251231.xsd#bios_InterestLimitationCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:to="loc_bios_InterestLimitationCarryforwardsMember_9894bfa2-16e3-4196-85ab-6f976f63b070" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FederalNetOperatingLossCarryfowardsAvailableToOffsetFutureTaxableIncomeMember_ed179e2f-9e52-4c27-aa78-a9db19d36626" xlink:href="bios-20251231.xsd#bios_FederalNetOperatingLossCarryfowardsAvailableToOffsetFutureTaxableIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_0fca321b-4477-40e3-87fe-ce77cb1ec3b8" xlink:to="loc_bios_FederalNetOperatingLossCarryfowardsAvailableToOffsetFutureTaxableIncomeMember_ed179e2f-9e52-4c27-aa78-a9db19d36626" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_090e44e4-9748-4d63-a6c7-c0a567a7fd39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_090e44e4-9748-4d63-a6c7-c0a567a7fd39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_25ec62cb-1f46-4e06-b38a-b07112fa102e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_25ec62cb-1f46-4e06-b38a-b07112fa102e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_15c8e3c5-9f1c-44f0-bb3f-3ff75cb5aacc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_15c8e3c5-9f1c-44f0-bb3f-3ff75cb5aacc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_TerminationFeeIncomeTaxEffect_5e9c7f02-1c5d-4148-9ef4-99b43dc99cb7" xlink:href="bios-20251231.xsd#bios_TerminationFeeIncomeTaxEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_bios_TerminationFeeIncomeTaxEffect_5e9c7f02-1c5d-4148-9ef4-99b43dc99cb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_93a4eada-3856-4088-a606-9beddf94a117" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_93a4eada-3856-4088-a606-9beddf94a117" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_17228b44-7a2a-4d1e-a0d5-2977c442db2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_17228b44-7a2a-4d1e-a0d5-2977c442db2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_686ff020-e19e-4733-af2d-fc365f0959a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_OperatingLossCarryforwards_686ff020-e19e-4733-af2d-fc365f0959a8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetInterestCarryforward_61e6fdb5-2516-430c-b326-733307130eee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetInterestCarryforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_DeferredTaxAssetInterestCarryforward_61e6fdb5-2516-430c-b326-733307130eee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_a6bfcea1-a423-4be5-8b5a-c526a5568674" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_2ecd1bf7-6953-481d-9ac9-1d047cef8820" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_a6bfcea1-a423-4be5-8b5a-c526a5568674" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/INCOMETAXESScheduleofValuationAllowanceforDeferredTaxAssetsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#INCOMETAXESScheduleofValuationAllowanceforDeferredTaxAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/INCOMETAXESScheduleofValuationAllowanceforDeferredTaxAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_79ec6b13-f701-420a-838e-786778c77627" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTable_3a640ef0-afaa-4149-aea3-7b6e77f18bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_79ec6b13-f701-420a-838e-786778c77627" xlink:to="loc_us-gaap_ValuationAllowanceTable_3a640ef0-afaa-4149-aea3-7b6e77f18bcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_9f96b719-455a-48c3-8640-755d9a026971" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_3a640ef0-afaa-4149-aea3-7b6e77f18bcd" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_9f96b719-455a-48c3-8640-755d9a026971" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_9f96b719-455a-48c3-8640-755d9a026971_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_9f96b719-455a-48c3-8640-755d9a026971" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_9f96b719-455a-48c3-8640-755d9a026971_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_1cf92d8c-a9c0-4d49-a389-fb6944b20bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_9f96b719-455a-48c3-8640-755d9a026971" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_1cf92d8c-a9c0-4d49-a389-fb6944b20bda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_f198f7b5-bcfc-4ba8-94f0-99c9b01c64d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_1cf92d8c-a9c0-4d49-a389-fb6944b20bda" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_f198f7b5-bcfc-4ba8-94f0-99c9b01c64d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_944dbd3d-667d-4755-bb7a-fc111c4f90f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_79ec6b13-f701-420a-838e-786778c77627" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_944dbd3d-667d-4755-bb7a-fc111c4f90f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_b9ad71f2-3ebe-49c6-a61b-96792e711e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_944dbd3d-667d-4755-bb7a-fc111c4f90f8" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_b9ad71f2-3ebe-49c6-a61b-96792e711e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_4bcc0bea-10df-4903-a0bf-c0f32d8fa946" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_944dbd3d-667d-4755-bb7a-fc111c4f90f8" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_4bcc0bea-10df-4903-a0bf-c0f32d8fa946" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_c0dcc7d3-ea0d-427c-ab7e-9212bb4d1a35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_944dbd3d-667d-4755-bb7a-fc111c4f90f8" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_c0dcc7d3-ea0d-427c-ab7e-9212bb4d1a35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_749feb5e-3e0c-470b-8ca6-606ceb482f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_68d7a3eb-87e7-4d17-8391-a9ff51776615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_a8d164d4-494a-4a20-9487-c6cb448858c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_68d7a3eb-87e7-4d17-8391-a9ff51776615" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_a8d164d4-494a-4a20-9487-c6cb448858c0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6cde26ea-83a8-4111-b663-ca33ad311f0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_a8d164d4-494a-4a20-9487-c6cb448858c0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6cde26ea-83a8-4111-b663-ca33ad311f0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6cde26ea-83a8-4111-b663-ca33ad311f0f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6cde26ea-83a8-4111-b663-ca33ad311f0f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6cde26ea-83a8-4111-b663-ca33ad311f0f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0a5edbf9-ec00-4452-8be4-a3fc7413faaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6cde26ea-83a8-4111-b663-ca33ad311f0f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0a5edbf9-ec00-4452-8be4-a3fc7413faaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_0d136b05-75ca-43dc-8ccd-7690bd034bf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0a5edbf9-ec00-4452-8be4-a3fc7413faaf" xlink:to="loc_us-gaap_StockOptionMember_0d136b05-75ca-43dc-8ccd-7690bd034bf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_RestrictedStockAwardMember_e1d08495-4576-4320-ab1a-25b94cfc813d" xlink:href="bios-20251231.xsd#bios_RestrictedStockAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0a5edbf9-ec00-4452-8be4-a3fc7413faaf" xlink:to="loc_bios_RestrictedStockAwardMember_e1d08495-4576-4320-ab1a-25b94cfc813d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_PerformanceStockUnitMember_a6b07516-ffb8-4735-b1b6-c6cede2b6105" xlink:href="bios-20251231.xsd#bios_PerformanceStockUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0a5edbf9-ec00-4452-8be4-a3fc7413faaf" xlink:to="loc_bios_PerformanceStockUnitMember_a6b07516-ffb8-4735-b1b6-c6cede2b6105" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_03c7b36f-6358-4943-b832-403ecea9c3d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_68d7a3eb-87e7-4d17-8391-a9ff51776615" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_03c7b36f-6358-4943-b832-403ecea9c3d3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/EARNINGSPERSHAREScheduleofBasicandDilutedEarningsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#EARNINGSPERSHAREScheduleofBasicandDilutedEarningsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/EARNINGSPERSHAREScheduleofBasicandDilutedEarningsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_ecde3dc0-3810-4397-99b5-10d6549591d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_ecde3dc0-3810-4397-99b5-10d6549591d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a71bfbf4-979c-47d5-ae06-978c19a9a6c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_ecde3dc0-3810-4397-99b5-10d6549591d8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a71bfbf4-979c-47d5-ae06-978c19a9a6c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a71bfbf4-979c-47d5-ae06-978c19a9a6c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a71bfbf4-979c-47d5-ae06-978c19a9a6c9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a71bfbf4-979c-47d5-ae06-978c19a9a6c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab1cb363-65d6-4204-b5a8-a0dcd49e6191" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a71bfbf4-979c-47d5-ae06-978c19a9a6c9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab1cb363-65d6-4204-b5a8-a0dcd49e6191" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_AmedisysIncMember_49a77881-b2b3-4e07-84dd-e31262bd9120" xlink:href="bios-20251231.xsd#bios_AmedisysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab1cb363-65d6-4204-b5a8-a0dcd49e6191" xlink:to="loc_bios_AmedisysIncMember_49a77881-b2b3-4e07-84dd-e31262bd9120" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f4105f64-5018-4527-9672-25ff8d3ad9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_NetIncomeLoss_f4105f64-5018-4527-9672-25ff8d3ad9b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_cc927b94-e02e-464f-8f63-bbcdc58cc597" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_cc927b94-e02e-464f-8f63-bbcdc58cc597" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_4f6ffae8-2855-4cfd-aa1e-642a2435c3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_EarningsPerShareBasic_4f6ffae8-2855-4cfd-aa1e-642a2435c3b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_028463ef-fba5-4952-b3a0-fc28c21a0378" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_028463ef-fba5-4952-b3a0-fc28c21a0378" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_f3055ef1-4e03-47c9-b280-447804d38638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_f3055ef1-4e03-47c9-b280-447804d38638" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_5391320c-0db1-4346-9f33-4f1bb2294966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_us-gaap_EarningsPerShareDiluted_5391320c-0db1-4346-9f33-4f1bb2294966" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_BusinessCombinationContingentConsiderationAssetTerminationFee_e0b65861-5524-4436-9d12-64db55cd0e98" xlink:href="bios-20251231.xsd#bios_BusinessCombinationContingentConsiderationAssetTerminationFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_702f33df-7df4-4bc3-83ca-19e265e9916d" xlink:to="loc_bios_BusinessCombinationContingentConsiderationAssetTerminationFee_e0b65861-5524-4436-9d12-64db55cd0e98" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/PROPERTYANDEQUIPMENTDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#PROPERTYANDEQUIPMENTDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/PROPERTYANDEQUIPMENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_560810c4-6fd7-49aa-9abe-6e9fcb52016e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_560810c4-6fd7-49aa-9abe-6e9fcb52016e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ced7549e-172c-49e3-9568-b8be23523c26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_560810c4-6fd7-49aa-9abe-6e9fcb52016e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ced7549e-172c-49e3-9568-b8be23523c26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ced7549e-172c-49e3-9568-b8be23523c26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ced7549e-172c-49e3-9568-b8be23523c26" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ced7549e-172c-49e3-9568-b8be23523c26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ced7549e-172c-49e3-9568-b8be23523c26" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_InfusionPumpsMember_367dfae2-615d-47c3-8768-880fd6c04e91" xlink:href="bios-20251231.xsd#bios_InfusionPumpsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:to="loc_bios_InfusionPumpsMember_367dfae2-615d-47c3-8768-880fd6c04e91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_EquipmentFurnitureAndOtherMember_4aa7d37d-3731-4f7c-ba35-51a2940c79c0" xlink:href="bios-20251231.xsd#bios_EquipmentFurnitureAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:to="loc_bios_EquipmentFurnitureAndOtherMember_4aa7d37d-3731-4f7c-ba35-51a2940c79c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_65faad44-10a6-4f4e-b617-2bf7f86caa0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_65faad44-10a6-4f4e-b617-2bf7f86caa0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_d36beb64-ad32-494d-84d7-87bf7bc0aa79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_d36beb64-ad32-494d-84d7-87bf7bc0aa79" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetUnderConstructionMember_cc2fcc7d-6e32-42a1-ad26-a743685b5830" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetUnderConstructionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6dd67146-c96a-4ffc-819e-d7948643b24d" xlink:to="loc_us-gaap_AssetUnderConstructionMember_cc2fcc7d-6e32-42a1-ad26-a743685b5830" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_a9562f5b-1724-407a-87d7-160ede72730c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_560810c4-6fd7-49aa-9abe-6e9fcb52016e" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_a9562f5b-1724-407a-87d7-160ede72730c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a9562f5b-1724-407a-87d7-160ede72730c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a9562f5b-1724-407a-87d7-160ede72730c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a9562f5b-1724-407a-87d7-160ede72730c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_25582b19-c8c8-4ffa-83ee-e42e47088c61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a9562f5b-1724-407a-87d7-160ede72730c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_25582b19-c8c8-4ffa-83ee-e42e47088c61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_e8d74e59-4536-47c8-b19f-c48fb9f5a008" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_25582b19-c8c8-4ffa-83ee-e42e47088c61" xlink:to="loc_us-gaap_CostOfSalesMember_e8d74e59-4536-47c8-b19f-c48fb9f5a008" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenseMember_6d4aee68-657d-4642-9423-af04f1b87bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_25582b19-c8c8-4ffa-83ee-e42e47088c61" xlink:to="loc_us-gaap_OperatingExpenseMember_6d4aee68-657d-4642-9423-af04f1b87bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_1f8cc454-9d7b-4aa1-9865-28129c4a53a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_1f8cc454-9d7b-4aa1-9865-28129c4a53a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9544dd1e-8086-42ec-927c-9c3628671095" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9544dd1e-8086-42ec-927c-9c3628671095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_8cd5debd-7c0f-40be-bf8a-2fc66aba798b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_8cd5debd-7c0f-40be-bf8a-2fc66aba798b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_f10d0a5f-cf68-4579-a2a2-4fd9d396a38e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4d8f4102-16f6-4c9d-b08e-c377b60f8b5e" xlink:to="loc_us-gaap_Depreciation_f10d0a5f-cf68-4579-a2a2-4fd9d396a38e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofCarryingAmountandAccumulatedAmortizationofIntangibleAssetsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSScheduleofCarryingAmountandAccumulatedAmortizationofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofCarryingAmountandAccumulatedAmortizationofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_391f607c-743a-406c-807a-deba1425a4df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_82b97e1d-538c-436c-a7fa-1b6a783e9090" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_391f607c-743a-406c-807a-deba1425a4df" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_82b97e1d-538c-436c-a7fa-1b6a783e9090" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a44dbe3c-c13a-4555-82d7-4db905929861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_82b97e1d-538c-436c-a7fa-1b6a783e9090" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a44dbe3c-c13a-4555-82d7-4db905929861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a44dbe3c-c13a-4555-82d7-4db905929861_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a44dbe3c-c13a-4555-82d7-4db905929861" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a44dbe3c-c13a-4555-82d7-4db905929861_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_421e8a36-a081-4425-8cfd-07d39aa58d05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a44dbe3c-c13a-4555-82d7-4db905929861" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_421e8a36-a081-4425-8cfd-07d39aa58d05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerListsMember_d9c00e3c-f8a1-470b-9594-2a6c71746381" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerListsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_421e8a36-a081-4425-8cfd-07d39aa58d05" xlink:to="loc_us-gaap_CustomerListsMember_d9c00e3c-f8a1-470b-9594-2a6c71746381" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_b0103fbf-2763-425c-b11b-77df1464dfc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_421e8a36-a081-4425-8cfd-07d39aa58d05" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_b0103fbf-2763-425c-b11b-77df1464dfc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_83a7a19f-74fd-4eaa-979b-62c482cbb0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_421e8a36-a081-4425-8cfd-07d39aa58d05" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_83a7a19f-74fd-4eaa-979b-62c482cbb0e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5e4d9904-1663-40fb-8fc0-08c2fff89994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_391f607c-743a-406c-807a-deba1425a4df" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5e4d9904-1663-40fb-8fc0-08c2fff89994" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c9691ace-e8d1-4c28-897e-6bc1252a5707" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_391f607c-743a-406c-807a-deba1425a4df" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c9691ace-e8d1-4c28-897e-6bc1252a5707" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8876ce67-1fae-43ba-b4de-09b5e29f88f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_391f607c-743a-406c-807a-deba1425a4df" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8876ce67-1fae-43ba-b4de-09b5e29f88f5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/INDEBTEDNESSScheduleofDebtDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#INDEBTEDNESSScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/INDEBTEDNESSScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_cd145980-f657-466b-a07c-ceac647f7df3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_DebtInstrumentTable_cd145980-f657-466b-a07c-ceac647f7df3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1f62c775-e803-4c37-87bf-103e0a448fee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cd145980-f657-466b-a07c-ceac647f7df3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1f62c775-e803-4c37-87bf-103e0a448fee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1f62c775-e803-4c37-87bf-103e0a448fee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1f62c775-e803-4c37-87bf-103e0a448fee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1f62c775-e803-4c37-87bf-103e0a448fee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2bdb6dfb-c551-43fa-ac17-4783c59b6dfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1f62c775-e803-4c37-87bf-103e0a448fee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2bdb6dfb-c551-43fa-ac17-4783c59b6dfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_310c2bc8-2f10-40a1-ad3c-39d272a935de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_2bdb6dfb-c551-43fa-ac17-4783c59b6dfd" xlink:to="loc_us-gaap_SeniorNotesMember_310c2bc8-2f10-40a1-ad3c-39d272a935de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_9137740c-3aad-4dbd-ba86-16e7e4f65e62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cd145980-f657-466b-a07c-ceac647f7df3" xlink:to="loc_us-gaap_CreditFacilityAxis_9137740c-3aad-4dbd-ba86-16e7e4f65e62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_9137740c-3aad-4dbd-ba86-16e7e4f65e62_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_9137740c-3aad-4dbd-ba86-16e7e4f65e62" xlink:to="loc_us-gaap_CreditFacilityDomain_9137740c-3aad-4dbd-ba86-16e7e4f65e62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c6b49d28-0f36-4d5a-a7d8-ca47a4e8e409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_9137740c-3aad-4dbd-ba86-16e7e4f65e62" xlink:to="loc_us-gaap_CreditFacilityDomain_c6b49d28-0f36-4d5a-a7d8-ca47a4e8e409" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a530da24-4c5f-486c-85c4-1e65489eb62a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_c6b49d28-0f36-4d5a-a7d8-ca47a4e8e409" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a530da24-4c5f-486c-85c4-1e65489eb62a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_fd9075ef-5201-4a1e-bddb-d55076940399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cd145980-f657-466b-a07c-ceac647f7df3" xlink:to="loc_us-gaap_DebtInstrumentAxis_fd9075ef-5201-4a1e-bddb-d55076940399" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fd9075ef-5201-4a1e-bddb-d55076940399_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_fd9075ef-5201-4a1e-bddb-d55076940399" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fd9075ef-5201-4a1e-bddb-d55076940399_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d2e08418-5a5b-47ef-b99c-a4ee32a1457a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_fd9075ef-5201-4a1e-bddb-d55076940399" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d2e08418-5a5b-47ef-b99c-a4ee32a1457a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienTermLoanMember_b72392e6-3ec5-4cdf-ba5f-f78e21f8a2b4" xlink:href="bios-20251231.xsd#bios_FirstLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d2e08418-5a5b-47ef-b99c-a4ee32a1457a" xlink:to="loc_bios_FirstLienTermLoanMember_b72392e6-3ec5-4cdf-ba5f-f78e21f8a2b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_SecondLienTermLoanMember_df027e5f-1d26-4212-b683-5893eb253b8b" xlink:href="bios-20251231.xsd#bios_SecondLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d2e08418-5a5b-47ef-b99c-a4ee32a1457a" xlink:to="loc_bios_SecondLienTermLoanMember_df027e5f-1d26-4212-b683-5893eb253b8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_390c8a1a-f08d-4c33-84f0-36dc6b60a0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_390c8a1a-f08d-4c33-84f0-36dc6b60a0d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_06b2aa68-3be5-4f4e-a1f4-e2f77fa232db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_06b2aa68-3be5-4f4e-a1f4-e2f77fa232db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_17129f5f-a6ac-4921-8d9c-907d0a44c075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_17129f5f-a6ac-4921-8d9c-907d0a44c075" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_a876ef5d-e0af-432d-bae9-27689366b393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_LongTermDebt_a876ef5d-e0af-432d-bae9-27689366b393" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_56e5e619-d1e5-4da1-ae51-4cf07b6516fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_LongTermDebtCurrent_56e5e619-d1e5-4da1-ae51-4cf07b6516fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_446b8639-677a-4487-bd8d-3b6a03eef026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_16ab80a6-6421-4050-b9b1-8c89ea629039" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_446b8639-677a-4487-bd8d-3b6a03eef026" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/INDEBTEDNESSAdditionalInformationDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#INDEBTEDNESSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/INDEBTEDNESSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_8acaaf99-b0cf-442e-806d-e29947dddb32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_DebtInstrumentAxis_8acaaf99-b0cf-442e-806d-e29947dddb32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8acaaf99-b0cf-442e-806d-e29947dddb32_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_8acaaf99-b0cf-442e-806d-e29947dddb32" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8acaaf99-b0cf-442e-806d-e29947dddb32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_8acaaf99-b0cf-442e-806d-e29947dddb32" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienTermLoanMember_576e651d-0499-45f7-8f0c-f88c5f76bb6b" xlink:href="bios-20251231.xsd#bios_FirstLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_FirstLienTermLoanMember_576e651d-0499-45f7-8f0c-f88c5f76bb6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienCreditAgreementFourthAmendmentMember_565ab575-cc55-4853-a85d-01e1d61f32d2" xlink:href="bios-20251231.xsd#bios_FirstLienCreditAgreementFourthAmendmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_FirstLienCreditAgreementFourthAmendmentMember_565ab575-cc55-4853-a85d-01e1d61f32d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_SeniorUnsecuredNotesDue2029Member_5823699f-1064-4641-9849-c7f9cb1c1194" xlink:href="bios-20251231.xsd#bios_SeniorUnsecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_SeniorUnsecuredNotesDue2029Member_5823699f-1064-4641-9849-c7f9cb1c1194" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienTermLoanRefinancingMember_95057b0c-6436-464d-8a86-0f00d4ef772e" xlink:href="bios-20251231.xsd#bios_FirstLienTermLoanRefinancingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_FirstLienTermLoanRefinancingMember_95057b0c-6436-464d-8a86-0f00d4ef772e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NewFirstLienTermLoanMember_e14587f9-548d-4edf-ba22-02eef0462886" xlink:href="bios-20251231.xsd#bios_NewFirstLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_NewFirstLienTermLoanMember_e14587f9-548d-4edf-ba22-02eef0462886" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_SecondLienCreditAgreementMember_8051513e-cdcd-4bc1-ae78-151442fa674a" xlink:href="bios-20251231.xsd#bios_SecondLienCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_SecondLienCreditAgreementMember_8051513e-cdcd-4bc1-ae78-151442fa674a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_CreditAgreementsEnteredInto2019Member_4734999f-4b2c-4cb9-9243-3cfee4437e38" xlink:href="bios-20251231.xsd#bios_CreditAgreementsEnteredInto2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_CreditAgreementsEnteredInto2019Member_4734999f-4b2c-4cb9-9243-3cfee4437e38" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_NewSeniorUnsecuredNotesMember_f76f2f6d-2e85-42ed-b7f4-a8c2fffb4697" xlink:href="bios-20251231.xsd#bios_NewSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_19b533fd-a5c8-432e-aa41-e089df142dc3" xlink:to="loc_bios_NewSeniorUnsecuredNotesMember_f76f2f6d-2e85-42ed-b7f4-a8c2fffb4697" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LienCategoryAxis_de1eeabd-f465-49cc-9d83-9eaf42479221" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LienCategoryAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_LienCategoryAxis_de1eeabd-f465-49cc-9d83-9eaf42479221" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LienCategoryDomain_de1eeabd-f465-49cc-9d83-9eaf42479221_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LienCategoryDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LienCategoryAxis_de1eeabd-f465-49cc-9d83-9eaf42479221" xlink:to="loc_us-gaap_LienCategoryDomain_de1eeabd-f465-49cc-9d83-9eaf42479221_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LienCategoryDomain_1cdea7c8-0181-4cd7-a8b1-8d6a249af74a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LienCategoryDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LienCategoryAxis_de1eeabd-f465-49cc-9d83-9eaf42479221" xlink:to="loc_us-gaap_LienCategoryDomain_1cdea7c8-0181-4cd7-a8b1-8d6a249af74a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLienMember_334af82d-fefa-47fb-bbea-5d8227323b26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorLienMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LienCategoryDomain_1cdea7c8-0181-4cd7-a8b1-8d6a249af74a" xlink:to="loc_us-gaap_SeniorLienMember_334af82d-fefa-47fb-bbea-5d8227323b26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JuniorLienMember_91c059a9-e53c-4d7d-ab46-fc3b9e475c04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_JuniorLienMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LienCategoryDomain_1cdea7c8-0181-4cd7-a8b1-8d6a249af74a" xlink:to="loc_us-gaap_JuniorLienMember_91c059a9-e53c-4d7d-ab46-fc3b9e475c04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_56060302-7fe3-45b2-bb07-0e8c75df9302" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_56060302-7fe3-45b2-bb07-0e8c75df9302" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_56060302-7fe3-45b2-bb07-0e8c75df9302_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_56060302-7fe3-45b2-bb07-0e8c75df9302" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_56060302-7fe3-45b2-bb07-0e8c75df9302_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8786f46c-a2d0-4885-a1bb-b7b18e7ed126" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_56060302-7fe3-45b2-bb07-0e8c75df9302" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_8786f46c-a2d0-4885-a1bb-b7b18e7ed126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_42b4dedd-6fd0-49dd-b77d-1109e9eccc8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8786f46c-a2d0-4885-a1bb-b7b18e7ed126" xlink:to="loc_us-gaap_SeniorNotesMember_42b4dedd-6fd0-49dd-b77d-1109e9eccc8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_08cac492-5525-4d5a-8b26-6add8d41ae0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_VariableRateAxis_08cac492-5525-4d5a-8b26-6add8d41ae0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_08cac492-5525-4d5a-8b26-6add8d41ae0b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_08cac492-5525-4d5a-8b26-6add8d41ae0b" xlink:to="loc_us-gaap_VariableRateDomain_08cac492-5525-4d5a-8b26-6add8d41ae0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_01218710-a151-47a6-b4ed-f23ca23bee3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_08cac492-5525-4d5a-8b26-6add8d41ae0b" xlink:to="loc_us-gaap_VariableRateDomain_01218710-a151-47a6-b4ed-f23ca23bee3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_2a333713-c328-4f52-925a-66cf37b0b8fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_01218710-a151-47a6-b4ed-f23ca23bee3b" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_2a333713-c328-4f52-925a-66cf37b0b8fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_c4558669-9dff-4746-be1f-4036ccd93ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_01218710-a151-47a6-b4ed-f23ca23bee3b" xlink:to="loc_us-gaap_BaseRateMember_c4558669-9dff-4746-be1f-4036ccd93ccc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateFloorMember_f5e3a8b5-9cce-4af5-9b60-f14385844d37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateFloorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_01218710-a151-47a6-b4ed-f23ca23bee3b" xlink:to="loc_us-gaap_InterestRateFloorMember_f5e3a8b5-9cce-4af5-9b60-f14385844d37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_f62e17d3-7fae-436c-b8c1-2b919277b9bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_CreditFacilityAxis_f62e17d3-7fae-436c-b8c1-2b919277b9bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_f62e17d3-7fae-436c-b8c1-2b919277b9bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_f62e17d3-7fae-436c-b8c1-2b919277b9bd" xlink:to="loc_us-gaap_CreditFacilityDomain_f62e17d3-7fae-436c-b8c1-2b919277b9bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bc4896e8-e826-4784-8401-dee9b3b1352c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_f62e17d3-7fae-436c-b8c1-2b919277b9bd" xlink:to="loc_us-gaap_CreditFacilityDomain_bc4896e8-e826-4784-8401-dee9b3b1352c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_42279605-dbd9-4dd2-9984-a44a9ba692bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bc4896e8-e826-4784-8401-dee9b3b1352c" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_42279605-dbd9-4dd2-9984-a44a9ba692bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_ab6dd02e-cf95-4db1-9556-8c17e0e6b623" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_ab6dd02e-cf95-4db1-9556-8c17e0e6b623" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_ab6dd02e-cf95-4db1-9556-8c17e0e6b623_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ab6dd02e-cf95-4db1-9556-8c17e0e6b623" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_ab6dd02e-cf95-4db1-9556-8c17e0e6b623_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_94681fd8-e7bc-4180-a312-62438ca46827" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ab6dd02e-cf95-4db1-9556-8c17e0e6b623" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_94681fd8-e7bc-4180-a312-62438ca46827" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_2f888a39-8bd1-42a1-82c2-7b3fc635af7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_94681fd8-e7bc-4180-a312-62438ca46827" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_2f888a39-8bd1-42a1-82c2-7b3fc635af7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_GainLossOnDebtExtinguishmentMember_128692a9-6d40-44e9-a655-1542fa89dd7b" xlink:href="bios-20251231.xsd#bios_GainLossOnDebtExtinguishmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_94681fd8-e7bc-4180-a312-62438ca46827" xlink:to="loc_bios_GainLossOnDebtExtinguishmentMember_128692a9-6d40-44e9-a655-1542fa89dd7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OtherNetMember_8c59a836-404c-4e31-b8db-f0d096527167" xlink:href="bios-20251231.xsd#bios_OtherNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_94681fd8-e7bc-4180-a312-62438ca46827" xlink:to="loc_bios_OtherNetMember_8c59a836-404c-4e31-b8db-f0d096527167" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_bbe451f2-826f-4f7d-b613-2f2cf94e7859" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4951f1ba-b72c-4089-9151-4a191ff70fce" xlink:to="loc_srt_RangeAxis_bbe451f2-826f-4f7d-b613-2f2cf94e7859" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bbe451f2-826f-4f7d-b613-2f2cf94e7859_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_bbe451f2-826f-4f7d-b613-2f2cf94e7859" xlink:to="loc_srt_RangeMember_bbe451f2-826f-4f7d-b613-2f2cf94e7859_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b6f2ba2b-27dc-4ff4-b3e5-88831b9b574f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_bbe451f2-826f-4f7d-b613-2f2cf94e7859" xlink:to="loc_srt_RangeMember_b6f2ba2b-27dc-4ff4-b3e5-88831b9b574f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_42d54230-6bb0-4ec5-9321-feb7b8e7d09a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b6f2ba2b-27dc-4ff4-b3e5-88831b9b574f" xlink:to="loc_srt_MinimumMember_42d54230-6bb0-4ec5-9321-feb7b8e7d09a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b72f2de7-372b-4d11-8882-107b99c40b55" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b6f2ba2b-27dc-4ff4-b3e5-88831b9b574f" xlink:to="loc_srt_MaximumMember_b72f2de7-372b-4d11-8882-107b99c40b55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_92183ef0-dd51-46e3-b7da-fc420d8b7ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_92183ef0-dd51-46e3-b7da-fc420d8b7ffb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_DebtInstrumentIncreaseDecreaseInBorrowingCapacity_a3ca4261-9ba5-4f8a-8087-eac99b1c0824" xlink:href="bios-20251231.xsd#bios_DebtInstrumentIncreaseDecreaseInBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_bios_DebtInstrumentIncreaseDecreaseInBorrowingCapacity_a3ca4261-9ba5-4f8a-8087-eac99b1c0824" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_5dec27b5-7bdb-4e21-a284-bd7e4f70dc76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_5dec27b5-7bdb-4e21-a284-bd7e4f70dc76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_876333f3-7a01-440c-ad6c-68aa2ddb4247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_876333f3-7a01-440c-ad6c-68aa2ddb4247" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_eb5683c6-a5d9-4e8a-b1ea-b76f01b39817" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtWeightedAverageInterestRateOverTime"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_eb5683c6-a5d9-4e8a-b1ea-b76f01b39817" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_3bcd897a-8dea-4de7-ba5b-daa3d65ea13a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_3bcd897a-8dea-4de7-ba5b-daa3d65ea13a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_f2adc4cf-be96-4862-adb8-030501e6eb8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_f2adc4cf-be96-4862-adb8-030501e6eb8e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_019aff36-70bb-710f-837b-21f43281f81c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_RepaymentsOfDebt_019aff36-70bb-710f-837b-21f43281f81c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_d10190e4-2217-44d5-991c-8ce0162968e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_d10190e4-2217-44d5-991c-8ce0162968e3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_660d844a-b61d-487c-90b3-dad71f582742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_660d844a-b61d-487c-90b3-dad71f582742" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_0c22fac0-cfe4-4d0d-a118-de26ec0b43f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_0c22fac0-cfe4-4d0d-a118-de26ec0b43f8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_10579ae3-4c32-41be-a2c7-58441deede8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_10579ae3-4c32-41be-a2c7-58441deede8d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_81fc6cc3-e155-4ca6-8de8-b6f3a8e2b404" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_81fc6cc3-e155-4ca6-8de8-b6f3a8e2b404" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_f7cf7226-14b1-459a-bea9-edd3791c22c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_f7cf7226-14b1-459a-bea9-edd3791c22c9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e80c1e2e-fdef-4299-919a-8b66d43f255f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e80c1e2e-fdef-4299-919a-8b66d43f255f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_974349cf-7464-4157-954b-0d37998bf085" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_974349cf-7464-4157-954b-0d37998bf085" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_27a89932-81ff-454b-a3ca-8d2ebe21a3d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_27a89932-81ff-454b-a3ca-8d2ebe21a3d6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_DebtInstrumentIncreaseInBorrowingCapacity_90965a7d-8457-4368-8eaa-913cd7304825" xlink:href="bios-20251231.xsd#bios_DebtInstrumentIncreaseInBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_bios_DebtInstrumentIncreaseInBorrowingCapacity_90965a7d-8457-4368-8eaa-913cd7304825" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_c27906b9-4f18-4668-8a30-e15bf297f9df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_c27906b9-4f18-4668-8a30-e15bf297f9df" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_c421b950-1508-4d46-a573-c5a2fd6adc27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e869b156-be45-4931-8c99-c2736574cbc5" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_c421b950-1508-4d46-a573-c5a2fd6adc27" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/INDEBTEDNESSScheduleofEstimatedFairValuesofDebtObligationsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#INDEBTEDNESSScheduleofEstimatedFairValuesofDebtObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/INDEBTEDNESSScheduleofEstimatedFairValuesofDebtObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_c7775494-f9c3-4fdc-a678-1eb215fdf74e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_98717125-7df0-43e9-b421-c670451b30ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c7775494-f9c3-4fdc-a678-1eb215fdf74e" xlink:to="loc_us-gaap_DebtInstrumentTable_98717125-7df0-43e9-b421-c670451b30ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_a8be549c-ed92-476d-bda9-12165e41c081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_98717125-7df0-43e9-b421-c670451b30ce" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_a8be549c-ed92-476d-bda9-12165e41c081" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_a8be549c-ed92-476d-bda9-12165e41c081_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_a8be549c-ed92-476d-bda9-12165e41c081" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_a8be549c-ed92-476d-bda9-12165e41c081_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c2a20f33-d1c5-4dd7-9643-290af121ad0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_a8be549c-ed92-476d-bda9-12165e41c081" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c2a20f33-d1c5-4dd7-9643-290af121ad0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_601714d6-5e78-4e28-9478-ef1297409976" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_c2a20f33-d1c5-4dd7-9643-290af121ad0f" xlink:to="loc_us-gaap_SeniorNotesMember_601714d6-5e78-4e28-9478-ef1297409976" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_37e511ee-0a27-49e5-86c0-56a148fd87ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_98717125-7df0-43e9-b421-c670451b30ce" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_37e511ee-0a27-49e5-86c0-56a148fd87ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37e511ee-0a27-49e5-86c0-56a148fd87ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_37e511ee-0a27-49e5-86c0-56a148fd87ea" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37e511ee-0a27-49e5-86c0-56a148fd87ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7fdcd4ae-7d80-4d87-b00a-82bcb129d630" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_37e511ee-0a27-49e5-86c0-56a148fd87ea" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7fdcd4ae-7d80-4d87-b00a-82bcb129d630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_549e0a6c-6732-44c9-a681-f608ed117b02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7fdcd4ae-7d80-4d87-b00a-82bcb129d630" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_549e0a6c-6732-44c9-a681-f608ed117b02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_693ed741-dc7f-441e-9546-5d9660166ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7fdcd4ae-7d80-4d87-b00a-82bcb129d630" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_693ed741-dc7f-441e-9546-5d9660166ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_c608d268-f762-42d3-b875-2fe5d8e138ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7fdcd4ae-7d80-4d87-b00a-82bcb129d630" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_c608d268-f762-42d3-b875-2fe5d8e138ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e978323d-cf7b-4a02-9065-ca1e415a0607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_98717125-7df0-43e9-b421-c670451b30ce" xlink:to="loc_us-gaap_DebtInstrumentAxis_e978323d-cf7b-4a02-9065-ca1e415a0607" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e978323d-cf7b-4a02-9065-ca1e415a0607_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e978323d-cf7b-4a02-9065-ca1e415a0607" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e978323d-cf7b-4a02-9065-ca1e415a0607_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8a5ed2cd-da63-40c8-babe-f74f236f5e84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e978323d-cf7b-4a02-9065-ca1e415a0607" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8a5ed2cd-da63-40c8-babe-f74f236f5e84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienTermLoanMember_b06238c8-2dae-423d-8809-880fd643599b" xlink:href="bios-20251231.xsd#bios_FirstLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8a5ed2cd-da63-40c8-babe-f74f236f5e84" xlink:to="loc_bios_FirstLienTermLoanMember_b06238c8-2dae-423d-8809-880fd643599b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_74bb2f6c-6cb7-4bbb-9701-ae1fe4da22c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c7775494-f9c3-4fdc-a678-1eb215fdf74e" xlink:to="loc_us-gaap_LongTermDebtFairValue_74bb2f6c-6cb7-4bbb-9701-ae1fe4da22c7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSAdditionalInformationDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#DERIVATIVEINSTRUMENTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_68dda887-c9d8-452a-b9f8-515e97072792" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_68dda887-c9d8-452a-b9f8-515e97072792" xlink:to="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_3cd4e209-b132-42a6-b265-aac286b60207" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:to="loc_us-gaap_DebtInstrumentAxis_3cd4e209-b132-42a6-b265-aac286b60207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3cd4e209-b132-42a6-b265-aac286b60207_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3cd4e209-b132-42a6-b265-aac286b60207" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3cd4e209-b132-42a6-b265-aac286b60207_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_29ffbcb6-5624-4199-9f9a-3078ce0c39ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3cd4e209-b132-42a6-b265-aac286b60207" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_29ffbcb6-5624-4199-9f9a-3078ce0c39ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_FirstLienTermLoanMember_484d0201-919b-41c3-b832-29e39a551ac7" xlink:href="bios-20251231.xsd#bios_FirstLienTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29ffbcb6-5624-4199-9f9a-3078ce0c39ca" xlink:to="loc_bios_FirstLienTermLoanMember_484d0201-919b-41c3-b832-29e39a551ac7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_305e19ae-4c59-4e12-88bd-ff00b28ab931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_305e19ae-4c59-4e12-88bd-ff00b28ab931" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_305e19ae-4c59-4e12-88bd-ff00b28ab931_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_305e19ae-4c59-4e12-88bd-ff00b28ab931" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_305e19ae-4c59-4e12-88bd-ff00b28ab931_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1f4f84dc-15b4-49db-9c56-33dcbd380139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_305e19ae-4c59-4e12-88bd-ff00b28ab931" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1f4f84dc-15b4-49db-9c56-33dcbd380139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_868299eb-6341-4c2c-ac3c-3e06eaad7fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1f4f84dc-15b4-49db-9c56-33dcbd380139" xlink:to="loc_us-gaap_InterestRateCapMember_868299eb-6341-4c2c-ac3c-3e06eaad7fcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:to="loc_us-gaap_HedgingDesignationAxis_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d" xlink:to="loc_us-gaap_HedgingDesignationDomain_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_22932207-bcb7-4bb3-be58-dda68e3e55cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_df6f3e7a-c0e7-49ce-ae40-c9f559e62f8d" xlink:to="loc_us-gaap_HedgingDesignationDomain_22932207-bcb7-4bb3-be58-dda68e3e55cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_c43cc6df-56a2-413d-80fc-772c70916d24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_22932207-bcb7-4bb3-be58-dda68e3e55cf" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_c43cc6df-56a2-413d-80fc-772c70916d24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f1d9a416-5907-4f9f-bd4a-cd2b57bff00c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_bd17d1da-0a1d-4da1-950d-9319e635b3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ad9fe8c2-ae80-4d87-80a2-b59b4a9567cd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_bd17d1da-0a1d-4da1-950d-9319e635b3fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_0b9152cb-40af-4f60-8492-16831d9c42c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_bd17d1da-0a1d-4da1-950d-9319e635b3fb" xlink:to="loc_us-gaap_SeniorNotesMember_0b9152cb-40af-4f60-8492-16831d9c42c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_fa386a90-3297-4889-8fa1-4c82c85a7aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_68dda887-c9d8-452a-b9f8-515e97072792" xlink:to="loc_us-gaap_DerivativeNotionalAmount_fa386a90-3297-4889-8fa1-4c82c85a7aa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_55864381-1d88-479a-b738-aa73c598942a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_68dda887-c9d8-452a-b9f8-515e97072792" xlink:to="loc_us-gaap_DerivativeTermOfContract_55864381-1d88-479a-b738-aa73c598942a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_23ce4bb8-0ce0-4592-89a7-efd1c21359b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_68dda887-c9d8-452a-b9f8-515e97072792" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_23ce4bb8-0ce0-4592-89a7-efd1c21359b6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSScheduleofBalanceSheetLocationofDerivativesDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#DERIVATIVEINSTRUMENTSScheduleofBalanceSheetLocationofDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSScheduleofBalanceSheetLocationofDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_4e073125-7300-4ba0-b11b-19786bc522e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_372a96ae-31d0-4b9c-9d42-a85a0af58a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_4e073125-7300-4ba0-b11b-19786bc522e0" xlink:to="loc_us-gaap_DerivativeTable_372a96ae-31d0-4b9c-9d42-a85a0af58a0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_3089c88b-63ca-487b-90da-25401333a73e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_372a96ae-31d0-4b9c-9d42-a85a0af58a0b" xlink:to="loc_us-gaap_HedgingDesignationAxis_3089c88b-63ca-487b-90da-25401333a73e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_3089c88b-63ca-487b-90da-25401333a73e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_3089c88b-63ca-487b-90da-25401333a73e" xlink:to="loc_us-gaap_HedgingDesignationDomain_3089c88b-63ca-487b-90da-25401333a73e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_8f785dfc-b5b1-4520-9c57-2ad1fac79d4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_3089c88b-63ca-487b-90da-25401333a73e" xlink:to="loc_us-gaap_HedgingDesignationDomain_8f785dfc-b5b1-4520-9c57-2ad1fac79d4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_ff4d3943-d81b-46b4-86e9-06cc739ebd9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8f785dfc-b5b1-4520-9c57-2ad1fac79d4e" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_ff4d3943-d81b-46b4-86e9-06cc739ebd9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_5eaf47ab-a5ee-40a5-b413-b0f18d78544a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_372a96ae-31d0-4b9c-9d42-a85a0af58a0b" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_5eaf47ab-a5ee-40a5-b413-b0f18d78544a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_5eaf47ab-a5ee-40a5-b413-b0f18d78544a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_5eaf47ab-a5ee-40a5-b413-b0f18d78544a" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_5eaf47ab-a5ee-40a5-b413-b0f18d78544a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_4b4fa9fb-290f-4d1f-afe1-b4ae6a8b7b84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_5eaf47ab-a5ee-40a5-b413-b0f18d78544a" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_4b4fa9fb-290f-4d1f-afe1-b4ae6a8b7b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_6d958bbb-fd9a-4bc3-82ca-cdd8e74c38e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4b4fa9fb-290f-4d1f-afe1-b4ae6a8b7b84" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_6d958bbb-fd9a-4bc3-82ca-cdd8e74c38e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_2decf1fa-d6eb-4c12-9874-f2979b345c54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4b4fa9fb-290f-4d1f-afe1-b4ae6a8b7b84" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_2decf1fa-d6eb-4c12-9874-f2979b345c54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_77e791e3-fff8-468e-bf9d-cb6f069186fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_372a96ae-31d0-4b9c-9d42-a85a0af58a0b" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_77e791e3-fff8-468e-bf9d-cb6f069186fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_77e791e3-fff8-468e-bf9d-cb6f069186fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_77e791e3-fff8-468e-bf9d-cb6f069186fe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_77e791e3-fff8-468e-bf9d-cb6f069186fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_68057866-119c-42ff-b4bf-fd24a5895b28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_77e791e3-fff8-468e-bf9d-cb6f069186fe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_68057866-119c-42ff-b4bf-fd24a5895b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_20072664-ff6d-48d8-b327-330fbbcd0e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_68057866-119c-42ff-b4bf-fd24a5895b28" xlink:to="loc_us-gaap_InterestRateCapMember_20072664-ff6d-48d8-b327-330fbbcd0e4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangementAbstract_d3bb99d2-5e6b-43c8-a3de-03a61d627298" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangementAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_4e073125-7300-4ba0-b11b-19786bc522e0" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangementAbstract_d3bb99d2-5e6b-43c8-a3de-03a61d627298" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_2109d597-3c7a-488b-b74e-26141777fb74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangementAbstract_d3bb99d2-5e6b-43c8-a3de-03a61d627298" xlink:to="loc_us-gaap_DerivativeAssets_2109d597-3c7a-488b-b74e-26141777fb74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_39bfb72a-703b-4a06-8a68-7f5c1b7c799b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_4e073125-7300-4ba0-b11b-19786bc522e0" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_39bfb72a-703b-4a06-8a68-7f5c1b7c799b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSScheduleofPretaxGainLossonDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#DERIVATIVEINSTRUMENTSScheduleofPretaxGainLossonDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/DERIVATIVEINSTRUMENTSScheduleofPretaxGainLossonDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_c7bec2a4-3b84-445e-86ff-7ea19d2990f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_9919d3b4-8c58-4ea3-85c6-f54715696157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_c7bec2a4-3b84-445e-86ff-7ea19d2990f6" xlink:to="loc_us-gaap_DerivativeTable_9919d3b4-8c58-4ea3-85c6-f54715696157" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_47ee9daf-fa66-48ca-9a1b-15390af0974f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_9919d3b4-8c58-4ea3-85c6-f54715696157" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_47ee9daf-fa66-48ca-9a1b-15390af0974f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_47ee9daf-fa66-48ca-9a1b-15390af0974f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_47ee9daf-fa66-48ca-9a1b-15390af0974f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_47ee9daf-fa66-48ca-9a1b-15390af0974f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_e334a993-3a61-4c78-bc05-9d3c9e6f94b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_47ee9daf-fa66-48ca-9a1b-15390af0974f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_e334a993-3a61-4c78-bc05-9d3c9e6f94b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_6b021908-2528-42e1-b661-cfe74b57ce54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_e334a993-3a61-4c78-bc05-9d3c9e6f94b0" xlink:to="loc_us-gaap_InterestExpenseMember_6b021908-2528-42e1-b661-cfe74b57ce54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_9e99a789-5f4c-4539-8f91-421c4f810e78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_9919d3b4-8c58-4ea3-85c6-f54715696157" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_9e99a789-5f4c-4539-8f91-421c4f810e78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9e99a789-5f4c-4539-8f91-421c4f810e78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9e99a789-5f4c-4539-8f91-421c4f810e78" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9e99a789-5f4c-4539-8f91-421c4f810e78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d077cd3e-afaa-4516-9e23-3ba12e690ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9e99a789-5f4c-4539-8f91-421c4f810e78" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d077cd3e-afaa-4516-9e23-3ba12e690ec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_8fd57958-2f7a-41a2-8de7-345539cbfb0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_d077cd3e-afaa-4516-9e23-3ba12e690ec4" xlink:to="loc_us-gaap_InterestRateCapMember_8fd57958-2f7a-41a2-8de7-345539cbfb0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_81a5264d-8802-43c9-8c85-0bc52cc1699b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_c7bec2a4-3b84-445e-86ff-7ea19d2990f6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_81a5264d-8802-43c9-8c85-0bc52cc1699b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_a5ffb6a9-7fae-4971-a2ba-87dbc68b51d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_c7bec2a4-3b84-445e-86ff-7ea19d2990f6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_a5ffb6a9-7fae-4971-a2ba-87dbc68b51d2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONNarrativeDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKBASEDINCENTIVECOMPENSATIONNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_9e4435c4-6054-48f0-95b2-027d6a25a78e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:to="loc_us-gaap_PlanNameAxis_9e4435c4-6054-48f0-95b2-027d6a25a78e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_9e4435c4-6054-48f0-95b2-027d6a25a78e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_9e4435c4-6054-48f0-95b2-027d6a25a78e" xlink:to="loc_us-gaap_PlanNameDomain_9e4435c4-6054-48f0-95b2-027d6a25a78e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b12eeeda-0ab4-455f-890f-4a5d73e2b825" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_9e4435c4-6054-48f0-95b2-027d6a25a78e" xlink:to="loc_us-gaap_PlanNameDomain_b12eeeda-0ab4-455f-890f-4a5d73e2b825" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_A2018PlanMember_35c4980d-4ae6-453a-bcb6-fa2527813f69" xlink:href="bios-20251231.xsd#bios_A2018PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b12eeeda-0ab4-455f-890f-4a5d73e2b825" xlink:to="loc_bios_A2018PlanMember_35c4980d-4ae6-453a-bcb6-fa2527813f69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b0877033-e6c8-480a-9a78-37394789ef2b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:to="loc_srt_RangeAxis_b0877033-e6c8-480a-9a78-37394789ef2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b0877033-e6c8-480a-9a78-37394789ef2b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b0877033-e6c8-480a-9a78-37394789ef2b" xlink:to="loc_srt_RangeMember_b0877033-e6c8-480a-9a78-37394789ef2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4b6933ad-1bc0-485a-8863-c09e5b83e06d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b0877033-e6c8-480a-9a78-37394789ef2b" xlink:to="loc_srt_RangeMember_4b6933ad-1bc0-485a-8863-c09e5b83e06d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9c6177ed-0ab8-48bd-9acb-dacc6626d986" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4b6933ad-1bc0-485a-8863-c09e5b83e06d" xlink:to="loc_srt_MinimumMember_9c6177ed-0ab8-48bd-9acb-dacc6626d986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1b6a8c6f-c6fa-4060-bbe4-85a7f00b36e5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4b6933ad-1bc0-485a-8863-c09e5b83e06d" xlink:to="loc_srt_MaximumMember_1b6a8c6f-c6fa-4060-bbe4-85a7f00b36e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:to="loc_us-gaap_AwardTypeAxis_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ad5f2572-bbb2-4f9b-b1d6-a3cfd8a5d902" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_b78bc2d9-1ebf-4ec3-8397-059d6afd28f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:to="loc_us-gaap_EmployeeStockOptionMember_b78bc2d9-1ebf-4ec3-8397-059d6afd28f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_f233a71e-d507-47a2-b9a3-c539c99854d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:to="loc_us-gaap_RestrictedStockMember_f233a71e-d507-47a2-b9a3-c539c99854d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_PerformanceStockUnitsMember_0232dc00-1ddb-436a-a7e6-2a1ab2bb2f8c" xlink:href="bios-20251231.xsd#bios_PerformanceStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:to="loc_bios_PerformanceStockUnitsMember_0232dc00-1ddb-436a-a7e6-2a1ab2bb2f8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_A2024PerformanceStockUnitsMember_ec8d8cae-4b32-4c24-be26-af198506525c" xlink:href="bios-20251231.xsd#bios_A2024PerformanceStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ac91530-6491-481f-9eaf-4ea0261cbfa4" xlink:to="loc_bios_A2024PerformanceStockUnitsMember_ec8d8cae-4b32-4c24-be26-af198506525c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_6e1cd272-90ad-4eb7-988b-c26221aa3e37" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_fee15ae9-0506-489d-b735-2596c8f65a7a" xlink:to="loc_srt_TitleOfIndividualAxis_6e1cd272-90ad-4eb7-988b-c26221aa3e37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6e1cd272-90ad-4eb7-988b-c26221aa3e37_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_6e1cd272-90ad-4eb7-988b-c26221aa3e37" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6e1cd272-90ad-4eb7-988b-c26221aa3e37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0cf95a06-48e6-4d06-a976-83459cd72fcc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_6e1cd272-90ad-4eb7-988b-c26221aa3e37" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0cf95a06-48e6-4d06-a976-83459cd72fcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_3ba85a63-bff0-424d-90d7-1b3fc797cea1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_DirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0cf95a06-48e6-4d06-a976-83459cd72fcc" xlink:to="loc_srt_DirectorMember_3ba85a63-bff0-424d-90d7-1b3fc797cea1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d2b88402-c606-4ac1-ba2b-f90bdf01da75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d2b88402-c606-4ac1-ba2b-f90bdf01da75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_f180b96c-3a30-404b-99e3-e09c755a3158" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_f180b96c-3a30-404b-99e3-e09c755a3158" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_454266a6-100b-4771-97b3-db05de0f3c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_454266a6-100b-4771-97b3-db05de0f3c8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2_abab0b54-8d43-42d2-84c9-e3898cb51192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2_abab0b54-8d43-42d2-84c9-e3898cb51192" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_83ffc3bc-ceca-4e6d-8d0f-22b8a2184c97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_83ffc3bc-ceca-4e6d-8d0f-22b8a2184c97" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_55cd6de9-7c9a-4da8-9f8e-9ff2d5a1d90e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_55cd6de9-7c9a-4da8-9f8e-9ff2d5a1d90e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_68bb0021-2546-42d7-95ae-c018cccd6c48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_68bb0021-2546-42d7-95ae-c018cccd6c48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_fdebb25a-b5c2-4815-9d0b-f4fb8d480b0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_fdebb25a-b5c2-4815-9d0b-f4fb8d480b0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ad1febda-d7a3-40c7-8510-caeafbf1efb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ad1febda-d7a3-40c7-8510-caeafbf1efb6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3c9763ca-ceb2-4047-ac0f-e12a2b9f5205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3c9763ca-ceb2-4047-ac0f-e12a2b9f5205" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_5433fc17-94e3-4b4b-a6fb-ab4454f34408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_5433fc17-94e3-4b4b-a6fb-ab4454f34408" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_0fd0fbb8-9b0e-4f4e-894f-665ff0a62615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_0fd0fbb8-9b0e-4f4e-894f-665ff0a62615" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ShareBasedPaymentArrangementPercentageOfTargetSharesGranted_c531b6bd-9631-41eb-a5cc-9bd0fb12f691" xlink:href="bios-20251231.xsd#bios_ShareBasedPaymentArrangementPercentageOfTargetSharesGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_bios_ShareBasedPaymentArrangementPercentageOfTargetSharesGranted_c531b6bd-9631-41eb-a5cc-9bd0fb12f691" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ShareBasedPaymentArrangementInitialPercentageOfTargetSharesGranted_5a4c7a6d-2795-4c01-8d4e-51c31050a8c1" xlink:href="bios-20251231.xsd#bios_ShareBasedPaymentArrangementInitialPercentageOfTargetSharesGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_be774947-9e3e-4afc-80a9-945b9e23ccc5" xlink:to="loc_bios_ShareBasedPaymentArrangementInitialPercentageOfTargetSharesGranted_5a4c7a6d-2795-4c01-8d4e-51c31050a8c1" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofAssumptionsUsedtoComputeFairValueofStockOptionsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKBASEDINCENTIVECOMPENSATIONScheduleofAssumptionsUsedtoComputeFairValueofStockOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofAssumptionsUsedtoComputeFairValueofStockOptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ae245062-7181-4782-bf5a-df2c2aaa9232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ae245062-7181-4782-bf5a-df2c2aaa9232" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_dc8b1e6a-5c64-46af-9772-a06b5f3d70de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ae245062-7181-4782-bf5a-df2c2aaa9232" xlink:to="loc_us-gaap_AwardTypeAxis_dc8b1e6a-5c64-46af-9772-a06b5f3d70de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_dc8b1e6a-5c64-46af-9772-a06b5f3d70de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_dc8b1e6a-5c64-46af-9772-a06b5f3d70de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_dc8b1e6a-5c64-46af-9772-a06b5f3d70de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40763d25-23e3-4fe9-a5db-83a0644ef594" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_dc8b1e6a-5c64-46af-9772-a06b5f3d70de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40763d25-23e3-4fe9-a5db-83a0644ef594" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_f47d8663-a4bd-4c06-afdd-25f5fbe88a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40763d25-23e3-4fe9-a5db-83a0644ef594" xlink:to="loc_us-gaap_EmployeeStockOptionMember_f47d8663-a4bd-4c06-afdd-25f5fbe88a1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_729f5a3c-af6f-4852-b972-41bbeb9f830c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_729f5a3c-af6f-4852-b972-41bbeb9f830c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_0e3e6e36-911d-46bf-9316-d47fc6bb71d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_0e3e6e36-911d-46bf-9316-d47fc6bb71d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_cbd58f8a-3e35-4961-b54c-4a94af42acd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_cbd58f8a-3e35-4961-b54c-4a94af42acd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_0f686f95-0232-43fb-acd8-deee972b880b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fca9663-d69b-4839-b79c-c45704e4da20" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_0f686f95-0232-43fb-acd8-deee972b880b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofOutstandingandExercisableStockOptionsDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKBASEDINCENTIVECOMPENSATIONScheduleofOutstandingandExercisableStockOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofOutstandingandExercisableStockOptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d70e0d8f-31cf-45e6-978a-1063e8609ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d70e0d8f-31cf-45e6-978a-1063e8609ca1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_5739508f-3afc-4f1b-8f01-02de43af3624" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d70e0d8f-31cf-45e6-978a-1063e8609ca1" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_5739508f-3afc-4f1b-8f01-02de43af3624" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5739508f-3afc-4f1b-8f01-02de43af3624_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_5739508f-3afc-4f1b-8f01-02de43af3624" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5739508f-3afc-4f1b-8f01-02de43af3624_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_5739508f-3afc-4f1b-8f01-02de43af3624" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionExercisePriceRangeOneMember_b195defe-3b68-4ecf-b1a2-c83a127ea86e" xlink:href="bios-20251231.xsd#bios_OptionExercisePriceRangeOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:to="loc_bios_OptionExercisePriceRangeOneMember_b195defe-3b68-4ecf-b1a2-c83a127ea86e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionExercisePriceRangeTwoMember_a74e1e43-9c02-4fb4-96f3-2b5771f4a55b" xlink:href="bios-20251231.xsd#bios_OptionExercisePriceRangeTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:to="loc_bios_OptionExercisePriceRangeTwoMember_a74e1e43-9c02-4fb4-96f3-2b5771f4a55b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionExercisePriceRangeThreeMember_41dc7d70-c99c-41dc-aff6-05cf2554658c" xlink:href="bios-20251231.xsd#bios_OptionExercisePriceRangeThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:to="loc_bios_OptionExercisePriceRangeThreeMember_41dc7d70-c99c-41dc-aff6-05cf2554658c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionExercisePriceRangeFourMember_88982c59-7c92-40c3-8a8f-8a5cf1679410" xlink:href="bios-20251231.xsd#bios_OptionExercisePriceRangeFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_5cfe8a23-c5bb-4f02-9e70-3537d0b5af5f" xlink:to="loc_bios_OptionExercisePriceRangeFourMember_88982c59-7c92-40c3-8a8f-8a5cf1679410" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_dc71e18d-a7ad-4c35-868e-e2e7ffabcb9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_dc71e18d-a7ad-4c35-868e-e2e7ffabcb9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ea2820a8-9971-411f-8638-ed60cbdcd2af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ea2820a8-9971-411f-8638-ed60cbdcd2af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionsOutstandingAbstract_cb43b1e3-5a34-41e8-ba9a-684b5ae8a402" xlink:href="bios-20251231.xsd#bios_OptionsOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:to="loc_bios_OptionsOutstandingAbstract_cb43b1e3-5a34-41e8-ba9a-684b5ae8a402" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_cf9067f8-8082-4d68-ac1e-236677960137" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_OptionsOutstandingAbstract_cb43b1e3-5a34-41e8-ba9a-684b5ae8a402" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_cf9067f8-8082-4d68-ac1e-236677960137" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_676a3648-727e-416a-8050-4daa7dc9ee29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_OptionsOutstandingAbstract_cb43b1e3-5a34-41e8-ba9a-684b5ae8a402" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_676a3648-727e-416a-8050-4daa7dc9ee29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_e4b3fb82-3b56-455c-a39a-1440d9d22d19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_OptionsOutstandingAbstract_cb43b1e3-5a34-41e8-ba9a-684b5ae8a402" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_e4b3fb82-3b56-455c-a39a-1440d9d22d19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_OptionsExercisableAbstract_5ce11aec-41ac-424f-9e3e-71824ecece75" xlink:href="bios-20251231.xsd#bios_OptionsExercisableAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_78c4ac87-71b5-4949-b8f7-900c1ed994ab" xlink:to="loc_bios_OptionsExercisableAbstract_5ce11aec-41ac-424f-9e3e-71824ecece75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_8051df52-c606-45c9-b4e0-c05de88b4e6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_OptionsExercisableAbstract_5ce11aec-41ac-424f-9e3e-71824ecece75" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_8051df52-c606-45c9-b4e0-c05de88b4e6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_ec3b34dd-e717-4445-a4f4-f8952665ae6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_OptionsExercisableAbstract_5ce11aec-41ac-424f-9e3e-71824ecece75" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_ec3b34dd-e717-4445-a4f4-f8952665ae6b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofRestrictedStockAwardActivityDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKBASEDINCENTIVECOMPENSATIONScheduleofRestrictedStockAwardActivityDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKBASEDINCENTIVECOMPENSATIONScheduleofRestrictedStockAwardActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_39bbd94d-592d-439c-99fd-6a8f9c10e827" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6c41b9cb-3c02-437c-a955-86732a7dda25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_39bbd94d-592d-439c-99fd-6a8f9c10e827" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6c41b9cb-3c02-437c-a955-86732a7dda25" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b81feac8-b708-474e-942e-0618c1fbe138" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6c41b9cb-3c02-437c-a955-86732a7dda25" xlink:to="loc_us-gaap_AwardTypeAxis_b81feac8-b708-474e-942e-0618c1fbe138" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b81feac8-b708-474e-942e-0618c1fbe138_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b81feac8-b708-474e-942e-0618c1fbe138" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b81feac8-b708-474e-942e-0618c1fbe138_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9ade932-ddd7-45a4-bae4-1b87cde63c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b81feac8-b708-474e-942e-0618c1fbe138" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9ade932-ddd7-45a4-bae4-1b87cde63c43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e9bafde7-e286-4cac-8d72-09b7281d248a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9ade932-ddd7-45a4-bae4-1b87cde63c43" xlink:to="loc_us-gaap_RestrictedStockMember_e9bafde7-e286-4cac-8d72-09b7281d248a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_39bbd94d-592d-439c-99fd-6a8f9c10e827" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_72627351-b079-4113-b80c-7615cd7ac68d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_72627351-b079-4113-b80c-7615cd7ac68d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fd7344a8-65d4-4d7f-9dd1-96f67dabc447" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fd7344a8-65d4-4d7f-9dd1-96f67dabc447" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_61e8f186-2b3e-4172-a4e6-8eb536bdcdc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_61e8f186-2b3e-4172-a4e6-8eb536bdcdc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_7833e2d8-dce7-42da-859b-6347f1c0bdd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8e40c545-68d7-4ffa-ad0a-c24ec44c368e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_7833e2d8-dce7-42da-859b-6347f1c0bdd3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b4f3c7a0-8745-4b47-9586-e975346dfb6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_39bbd94d-592d-439c-99fd-6a8f9c10e827" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b9ab64fd-edb3-4719-bf9c-617258e56fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b9ab64fd-edb3-4719-bf9c-617258e56fb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_553e9450-7e24-42fa-a627-d70f20cae6ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_553e9450-7e24-42fa-a627-d70f20cae6ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6892f97b-f2cb-4aef-96c5-bf745d669a72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6892f97b-f2cb-4aef-96c5-bf745d669a72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_62ab5b48-e838-4c1d-a0f3-cf383321833a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cea6eac6-ae9d-4272-b82f-0ceac270bfa5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_62ab5b48-e838-4c1d-a0f3-cf383321833a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c185b3a3-8357-47eb-a6cc-f744c89003f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKHOLDERSEQUITYDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKHOLDERSEQUITYDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKHOLDERSEQUITYDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_dd0ab822-a14f-4aa7-b011-5d096e21e7ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_us-gaap_StatementClassOfStockAxis_dd0ab822-a14f-4aa7-b011-5d096e21e7ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_dd0ab822-a14f-4aa7-b011-5d096e21e7ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dd0ab822-a14f-4aa7-b011-5d096e21e7ad" xlink:to="loc_us-gaap_ClassOfStockDomain_dd0ab822-a14f-4aa7-b011-5d096e21e7ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d4e0cad2-8d2f-45af-a28e-1465974bd496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dd0ab822-a14f-4aa7-b011-5d096e21e7ad" xlink:to="loc_us-gaap_ClassOfStockDomain_d4e0cad2-8d2f-45af-a28e-1465974bd496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_c7a1453c-639e-4bae-95aa-3761d8a8ad62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d4e0cad2-8d2f-45af-a28e-1465974bd496" xlink:to="loc_us-gaap_CommonStockMember_c7a1453c-639e-4bae-95aa-3761d8a8ad62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_53f24b94-46f2-4829-bab7-f726a49b0e3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_53f24b94-46f2-4829-bab7-f726a49b0e3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_53f24b94-46f2-4829-bab7-f726a49b0e3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_53f24b94-46f2-4829-bab7-f726a49b0e3c" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_53f24b94-46f2-4829-bab7-f726a49b0e3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_94c9c7b1-5def-4b38-887d-d1374ee75276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_53f24b94-46f2-4829-bab7-f726a49b0e3c" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_94c9c7b1-5def-4b38-887d-d1374ee75276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_SecondaryOfferingMember_9c1a3434-4522-4f59-a47d-112ce0d7f511" xlink:href="bios-20251231.xsd#bios_SecondaryOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_94c9c7b1-5def-4b38-887d-d1374ee75276" xlink:to="loc_bios_SecondaryOfferingMember_9c1a3434-4522-4f59-a47d-112ce0d7f511" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_5d3de84d-6fad-4539-8054-7a394ffc58c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_5d3de84d-6fad-4539-8054-7a394ffc58c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_5d3de84d-6fad-4539-8054-7a394ffc58c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_5d3de84d-6fad-4539-8054-7a394ffc58c1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_5d3de84d-6fad-4539-8054-7a394ffc58c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_42e28611-3914-460e-ac95-b6cf6c09f399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_5d3de84d-6fad-4539-8054-7a394ffc58c1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_42e28611-3914-460e-ac95-b6cf6c09f399" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_A2017WarrantsMember_5e607385-7d20-4a1c-81b1-b39e36dc40a7" xlink:href="bios-20251231.xsd#bios_A2017WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_42e28611-3914-460e-ac95-b6cf6c09f399" xlink:to="loc_bios_A2017WarrantsMember_5e607385-7d20-4a1c-81b1-b39e36dc40a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_A2015WarrantsMember_a3800fe2-1cbf-46ba-91de-615a8351b946" xlink:href="bios-20251231.xsd#bios_A2015WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_42e28611-3914-460e-ac95-b6cf6c09f399" xlink:to="loc_bios_A2015WarrantsMember_a3800fe2-1cbf-46ba-91de-615a8351b946" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832" xlink:to="loc_us-gaap_EquityComponentDomain_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5378875a-7227-4878-86e7-3ceeb6593559" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dee78cd6-68ca-4f1f-af8a-cb8a62cc3832" xlink:to="loc_us-gaap_EquityComponentDomain_5378875a-7227-4878-86e7-3ceeb6593559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_936a7836-f970-4629-8b98-93e38a94f579" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5378875a-7227-4878-86e7-3ceeb6593559" xlink:to="loc_us-gaap_CommonStockMember_936a7836-f970-4629-8b98-93e38a94f579" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_baf41e3f-8e63-4315-a5ce-d862e627cd9f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_srt_RangeAxis_baf41e3f-8e63-4315-a5ce-d862e627cd9f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_baf41e3f-8e63-4315-a5ce-d862e627cd9f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_baf41e3f-8e63-4315-a5ce-d862e627cd9f" xlink:to="loc_srt_RangeMember_baf41e3f-8e63-4315-a5ce-d862e627cd9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1867fc59-6929-46e0-8d15-87eb34f05a5c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_baf41e3f-8e63-4315-a5ce-d862e627cd9f" xlink:to="loc_srt_RangeMember_1867fc59-6929-46e0-8d15-87eb34f05a5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9eb0a6e3-f8e2-4719-8980-fbb1c23129d7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1867fc59-6929-46e0-8d15-87eb34f05a5c" xlink:to="loc_srt_MinimumMember_9eb0a6e3-f8e2-4719-8980-fbb1c23129d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3c0b08c1-7bc7-41f0-8dea-e62f4b7e72fa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1867fc59-6929-46e0-8d15-87eb34f05a5c" xlink:to="loc_srt_MaximumMember_3c0b08c1-7bc7-41f0-8dea-e62f4b7e72fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_f49551ed-94c5-4cfb-ab70-15f29ac511ab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_srt_ShareRepurchaseProgramAxis_f49551ed-94c5-4cfb-ab70-15f29ac511ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_f49551ed-94c5-4cfb-ab70-15f29ac511ab_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_f49551ed-94c5-4cfb-ab70-15f29ac511ab" xlink:to="loc_srt_ShareRepurchaseProgramDomain_f49551ed-94c5-4cfb-ab70-15f29ac511ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_e2094731-2d37-4d5d-8353-f60ab82dc986" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_f49551ed-94c5-4cfb-ab70-15f29ac511ab" xlink:to="loc_srt_ShareRepurchaseProgramDomain_e2094731-2d37-4d5d-8353-f60ab82dc986" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_CommonStockRepurchaseProgramMember_58fa15c4-471d-49d6-b86c-6f454a06b6e7" xlink:href="bios-20251231.xsd#bios_CommonStockRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_e2094731-2d37-4d5d-8353-f60ab82dc986" xlink:to="loc_bios_CommonStockRepurchaseProgramMember_58fa15c4-471d-49d6-b86c-6f454a06b6e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019bb916-ceab-7745-8105-2c724ee867fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_1cd97871-475f-4452-b651-59fecb594207" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019bb916-ceab-7745-8105-2c724ee867fb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019bb916-ceab-7745-8105-2c724ee867fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019bb916-ceab-7745-8105-2c724ee867fb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019bb916-ceab-7745-8105-2c724ee867fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019bb916-ceab-759d-a50c-23367528bdaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019bb916-ceab-7745-8105-2c724ee867fb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019bb916-ceab-759d-a50c-23367528bdaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019bb917-024b-7a9f-865b-f4e050fd249f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019bb916-ceab-759d-a50c-23367528bdaf" xlink:to="loc_us-gaap_SubsequentEventMember_019bb917-024b-7a9f-865b-f4e050fd249f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_30c396db-8875-46ee-8f53-21ca7fd8d5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_30c396db-8875-46ee-8f53-21ca7fd8d5a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2a0aa884-8322-4866-91f0-e247d4d97f70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2a0aa884-8322-4866-91f0-e247d4d97f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_dec0b5b2-453a-4ee1-8972-2c4f5cbc9e24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantsAndRightsOutstandingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_dec0b5b2-453a-4ee1-8972-2c4f5cbc9e24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_3c5c7181-ade5-4a1c-94fa-b932b2178fff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_3c5c7181-ade5-4a1c-94fa-b932b2178fff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_c00c7f8e-6e4b-4dbe-b77c-9bdcdebfe7ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_c00c7f8e-6e4b-4dbe-b77c-9bdcdebfe7ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ClassofWarrantorRightSecuritiesExercised_7e23e954-6ef0-4653-83eb-001620f86fc8" xlink:href="bios-20251231.xsd#bios_ClassofWarrantorRightSecuritiesExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_bios_ClassofWarrantorRightSecuritiesExercised_7e23e954-6ef0-4653-83eb-001620f86fc8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_cd7ea02d-457b-4869-92ca-622cbbbb5d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_cd7ea02d-457b-4869-92ca-622cbbbb5d8c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ClassOfWarrantOrRightNumberOfSecuritiesExercised_ab30d061-5d7c-42a8-9be6-a7e415ac8228" xlink:href="bios-20251231.xsd#bios_ClassOfWarrantOrRightNumberOfSecuritiesExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_bios_ClassOfWarrantOrRightNumberOfSecuritiesExercised_ab30d061-5d7c-42a8-9be6-a7e415ac8228" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromWarrantExercises_288b699d-fac4-4a26-bda6-798e3f2f9b13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromWarrantExercises"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_ProceedsFromWarrantExercises_288b699d-fac4-4a26-bda6-798e3f2f9b13" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_ad67cfa0-312f-4c24-becb-ea33aeb8e616" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_ad67cfa0-312f-4c24-becb-ea33aeb8e616" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_ef0339b6-16e8-4d75-a6f7-a7b8dad0a264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_ef0339b6-16e8-4d75-a6f7-a7b8dad0a264" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_78af65e8-516e-4061-9216-91c2f91d05ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_78af65e8-516e-4061-9216-91c2f91d05ec" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_005851eb-4806-45f4-9622-f323b0b3126a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_005851eb-4806-45f4-9622-f323b0b3126a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_7a787827-e62e-4e0f-a698-3a31cefc22c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_TreasuryStockCommonShares_7a787827-e62e-4e0f-a698-3a31cefc22c9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_047f6ee0-e51f-4c10-a9c2-a549628f9074" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_650563cf-c907-4d44-b84e-695b36e99711" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_047f6ee0-e51f-4c10-a9c2-a549628f9074" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/STOCKHOLDERSEQUITYScheduleofChangesinSharesofCommonStockDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#STOCKHOLDERSEQUITYScheduleofChangesinSharesofCommonStockDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/STOCKHOLDERSEQUITYScheduleofChangesinSharesofCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_748fb334-b18a-4047-b595-2d98669cb406" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_74c877aa-e9c6-407e-ac85-2354806ff014" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_748fb334-b18a-4047-b595-2d98669cb406" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_74c877aa-e9c6-407e-ac85-2354806ff014" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_7b9061dd-c23e-4bb4-902e-636d7b959d68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_74c877aa-e9c6-407e-ac85-2354806ff014" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_7b9061dd-c23e-4bb4-902e-636d7b959d68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7b9061dd-c23e-4bb4-902e-636d7b959d68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7b9061dd-c23e-4bb4-902e-636d7b959d68" xlink:to="loc_us-gaap_EquityComponentDomain_7b9061dd-c23e-4bb4-902e-636d7b959d68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8ead642a-8a23-4db9-b9c3-a274666346a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7b9061dd-c23e-4bb4-902e-636d7b959d68" xlink:to="loc_us-gaap_EquityComponentDomain_8ead642a-8a23-4db9-b9c3-a274666346a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_a608abee-fcf9-438c-8e6a-ffc20414b0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8ead642a-8a23-4db9-b9c3-a274666346a0" xlink:to="loc_us-gaap_CommonStockMember_a608abee-fcf9-438c-8e6a-ffc20414b0c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cfc497d5-778a-48ef-b700-c5c1cdb5f749" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_748fb334-b18a-4047-b595-2d98669cb406" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cfc497d5-778a-48ef-b700-c5c1cdb5f749" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_b0f12f4e-7f7b-4a5e-a1d1-eee1eee2e3a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cfc497d5-778a-48ef-b700-c5c1cdb5f749" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_b0f12f4e-7f7b-4a5e-a1d1-eee1eee2e3a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_SharesIssuedDuringPeriodShares_8bba7e82-6994-408f-950a-c8c31684bb64" xlink:href="bios-20251231.xsd#bios_SharesIssuedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cfc497d5-778a-48ef-b700-c5c1cdb5f749" xlink:to="loc_bios_SharesIssuedDuringPeriodShares_8bba7e82-6994-408f-950a-c8c31684bb64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_f541fe13-9ee6-4da7-908f-6c920d56034b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cfc497d5-778a-48ef-b700-c5c1cdb5f749" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_f541fe13-9ee6-4da7-908f-6c920d56034b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_69adac14-8b60-454f-8835-a357d51a1958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#RELATEDPARTYTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_b26c2f10-3cca-4af2-be7c-0560cfc946a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_b26c2f10-3cca-4af2-be7c-0560cfc946a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_649f04d3-306e-43e4-ba14-dc95d9aa956d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_b26c2f10-3cca-4af2-be7c-0560cfc946a8" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_649f04d3-306e-43e4-ba14-dc95d9aa956d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_649f04d3-306e-43e4-ba14-dc95d9aa956d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_649f04d3-306e-43e4-ba14-dc95d9aa956d" xlink:to="loc_us-gaap_RelatedPartyDomain_649f04d3-306e-43e4-ba14-dc95d9aa956d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_d72f533f-7384-4acc-a302-e7b3ba2b16fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_649f04d3-306e-43e4-ba14-dc95d9aa956d" xlink:to="loc_us-gaap_RelatedPartyDomain_d72f533f-7384-4acc-a302-e7b3ba2b16fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_539566d2-3d22-49e8-975c-43707b09e6f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_d72f533f-7384-4acc-a302-e7b3ba2b16fc" xlink:to="loc_us-gaap_CorporateJointVentureMember_539566d2-3d22-49e8-975c-43707b09e6f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_22986bbf-1690-4cb7-b779-ab12b8490012" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_22986bbf-1690-4cb7-b779-ab12b8490012" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_019c6d31-a47d-7112-b797-4ede34f8b86e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_019c6d31-a47d-7112-b797-4ede34f8b86e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableOtherCurrentAndNoncurrent_2115bacf-ca4d-4b87-8e50-af7a09f62fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableOtherCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_AccountsPayableOtherCurrentAndNoncurrent_2115bacf-ca4d-4b87-8e50-af7a09f62fb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_27f00f5d-3b11-4f05-88b1-842050f81004" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_27f00f5d-3b11-4f05-88b1-842050f81004" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_c7f2a261-ab0f-40f9-9cc2-2f0d80c1b56b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_1c474415-0651-4f3f-b751-fbdeb766ac44" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_c7f2a261-ab0f-40f9-9cc2-2f0d80c1b56b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bioscrip.com/role/SEGMENTREPORTINGDetails" xlink:type="simple" xlink:href="bios-20251231.xsd#SEGMENTREPORTINGDetails"/>
  <link:definitionLink xlink:role="http://www.bioscrip.com/role/SEGMENTREPORTINGDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_bb687120-595c-498b-997e-c1610f7fd5f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_bb687120-595c-498b-997e-c1610f7fd5f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_849c29ab-07ac-4999-963f-a08c3423728e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_bb687120-595c-498b-997e-c1610f7fd5f9" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_849c29ab-07ac-4999-963f-a08c3423728e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_849c29ab-07ac-4999-963f-a08c3423728e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_849c29ab-07ac-4999-963f-a08c3423728e" xlink:to="loc_us-gaap_SegmentDomain_849c29ab-07ac-4999-963f-a08c3423728e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_37257c07-d1cc-428c-8d9a-d364e0032d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_849c29ab-07ac-4999-963f-a08c3423728e" xlink:to="loc_us-gaap_SegmentDomain_37257c07-d1cc-428c-8d9a-d364e0032d7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_ReportableSegmentMember_164b5d1d-4ab8-4abe-85c7-a3265ea76cec" xlink:href="bios-20251231.xsd#bios_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_37257c07-d1cc-428c-8d9a-d364e0032d7e" xlink:to="loc_bios_ReportableSegmentMember_164b5d1d-4ab8-4abe-85c7-a3265ea76cec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_75bc439b-b056-47c2-b63f-98f0aec63468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_75bc439b-b056-47c2-b63f-98f0aec63468" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_836b2fc4-bb05-48ce-b425-abe0542dbcc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:to="loc_us-gaap_OtherIncome_836b2fc4-bb05-48ce-b425-abe0542dbcc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_db6b82e7-99d6-4562-ab83-967a922c8fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:to="loc_us-gaap_Revenues_db6b82e7-99d6-4562-ab83-967a922c8fb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:href="bios-20251231.xsd#bios_IncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_035baa33-2738-4020-bc51-8e781ffcb13b" xlink:to="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_5ffd5c4e-be52-4679-bcd8-a78dff204833" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_CostOfRevenue_5ffd5c4e-be52-4679-bcd8-a78dff204833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_36e2b4e5-8dee-4229-8e0f-89dd9db6b672" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_LaborAndRelatedExpense_36e2b4e5-8dee-4229-8e0f-89dd9db6b672" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_c5ddf434-dbd5-4c5b-a720-2e730481f19f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_c5ddf434-dbd5-4c5b-a720-2e730481f19f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_ff52e6a8-c1f9-4bb0-944f-9919ed7cafd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_ff52e6a8-c1f9-4bb0-944f-9919ed7cafd6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_6f60a9a3-6481-4f11-9ac6-bed4b69cf343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_InterestExpenseNonoperating_6f60a9a3-6481-4f11-9ac6-bed4b69cf343" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_da01cc8b-4ccb-4b2a-8bec-9f52bc0795d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_da01cc8b-4ccb-4b2a-8bec-9f52bc0795d9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_84cc0ea9-fae1-4ca2-8791-b5a1d90a5af6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_84cc0ea9-fae1-4ca2-8791-b5a1d90a5af6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_4f4cfe8b-16d6-4a9a-9157-796b73c0fb64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_4f4cfe8b-16d6-4a9a-9157-796b73c0fb64" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_162ccfd3-d940-4e98-972e-2f737bb4852f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bios_IncomeExpenseAbstract_02f85f62-7020-41e0-a142-70d40fd1daa7" xlink:to="loc_us-gaap_NetIncomeLoss_162ccfd3-d940-4e98-972e-2f737bb4852f" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="102"/>
  </link:definitionLink>
</link:linkbase>
