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        <TitleTxt>President/Trustee</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>1509743</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>5032806</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>683271</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>16</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>1</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Lab Logistics LLC</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>30 Railroad Ave</AddressLine1Txt>
            <CityNm>West Haven</CityNm>
            <StateAbbreviationCd>CT</StateAbbreviationCd>
            <ZIPCd>06516</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Courier</ServicesDesc>
        <CompensationAmt>1883760</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Quest Diagnostics</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 822557</AddressLine1Txt>
            <CityNm>Philadelphia</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19182</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Diagnostic Services</ServicesDesc>
        <CompensationAmt>153621</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Brigham Womens Hospital</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>75 Francis St</AddressLine1Txt>
            <CityNm>Boston</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02115</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Lab Services</ServicesDesc>
        <CompensationAmt>143793</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>3</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>268036</GovernmentGrantsAmt>
      <TotalContributionsAmt>268036</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Lab test revenue</Desc>
        <BusinessCd>621500</BusinessCd>
        <TotalRevenueColumnAmt>103237172</TotalRevenueColumnAmt>
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        <ExclusionAmt>4242631</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>182506660</SecuritiesAmt>
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        <SecuritiesAmt>184481294</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>-1989926</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>-1989926</RelatedOrExemptFuncIncomeAmt>
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      <OtherRevenueMiscGrp>
        <Desc>Miscellaneous</Desc>
        <BusinessCd>621500</BusinessCd>
        <TotalRevenueColumnAmt>1548582</TotalRevenueColumnAmt>
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      <OtherRevenueTotalAmt>1548582</OtherRevenueTotalAmt>
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        <TotalRevenueColumnAmt>107306495</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>9629974</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>4242631</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
        <TotalAmt>2450</TotalAmt>
        <ProgramServicesAmt>2450</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>1108240</TotalAmt>
        <ManagementAndGeneralAmt>1108240</ManagementAndGeneralAmt>
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        <TotalAmt>35027250</TotalAmt>
        <ProgramServicesAmt>33829646</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1197604</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>1278056</ProgramServicesAmt>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>17441</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>22301</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>3198504</ProgramServicesAmt>
        <ManagementAndGeneralAmt>208683</ManagementAndGeneralAmt>
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      <InformationTechnologyGrp>
        <TotalAmt>609052</TotalAmt>
        <ProgramServicesAmt>571749</ProgramServicesAmt>
        <ManagementAndGeneralAmt>37303</ManagementAndGeneralAmt>
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      <OccupancyGrp>
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        <ProgramServicesAmt>2040503</ProgramServicesAmt>
        <ManagementAndGeneralAmt>133131</ManagementAndGeneralAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>230957</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15069</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>4646</ProgramServicesAmt>
        <ManagementAndGeneralAmt>103411</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>25933</ManagementAndGeneralAmt>
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        <TotalAmt>1614506</TotalAmt>
        <ProgramServicesAmt>1515621</ProgramServicesAmt>
        <ManagementAndGeneralAmt>98885</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>128933</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>Taxes - UBI</Desc>
        <TotalAmt>189171</TotalAmt>
        <ProgramServicesAmt>189171</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Medical supplies</Desc>
        <TotalAmt>20107689</TotalAmt>
        <ProgramServicesAmt>20107689</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Reference labs</Desc>
        <TotalAmt>8550108</TotalAmt>
        <ProgramServicesAmt>8550108</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Integrated services</Desc>
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        <ProgramServicesAmt>7698353</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>98841806</TotalAmt>
        <ProgramServicesAmt>93478417</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5363389</ManagementAndGeneralAmt>
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        <EOYAmt>5351</EOYAmt>
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        <EOYAmt>18289541</EOYAmt>
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        <EOYAmt>0</EOYAmt>
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        <EOYAmt>2749827</EOYAmt>
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        <BOYAmt>503852</BOYAmt>
        <EOYAmt>550585</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>16758960</LandBldgEquipCostOrOtherBssAmt>
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        <EOYAmt>134575645</EOYAmt>
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        <EOYAmt>10242808</EOYAmt>
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        <EOYAmt>3070353</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>13313161</EOYAmt>
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        <EOYAmt>134575645</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>8464689</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>3192598</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>-2500000</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
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      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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        <CurrentTaxYearMinus1YearAmt>201573</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>268036</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>93607198</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>13872605</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>1548582</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus2YearsAmt>136177864</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>134957155</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>109296421</CurrentTaxYearAmt>
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      <InvestmentIncomePYPct>0.16310</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Schedule A, Part III, Line 12, Explanation of Other Income:</FormAndLineReferenceDesc>
        <ExplanationTxt>Clinical and support services - 2018 Amount: $ 888,383. 2019 Amount: $ 771,095. 2020 Amount: $ 1,146,646. 2021 Amount: $ 1,056,335. 2022 Amount: $ 1,133,468. Purchase discounts - 2018 Amount: $ 131. 2019 Amount: $ 277. 2020 Amount: $ 180. 2021 Amount: $ 6. 2022 Amount: $ 584. Miscellaneous income - 2018 Amount: $ 25,993. 2019 Amount: $ 16,054. 2020 Amount: $ 85,205. 2021 Amount: $ 183,372. 2022 Amount: $ 255,417. Interest income - operating - 2018 Amount: $ 23,364. 2019 Amount: $ 11,961. Purchase rebates - 2019 Amount: $ 84,032. 2020 Amount: $ 113,379. 2021 Amount: $ 149,356. 2022 Amount: $ 104,813. Contract reserves - 2019 Amount: $ 38,000. Program income - 2021 Amount: $ 1,800. 2022 Amount: $ 54,300. Fees for service agreement - 2021 Amount: $ 84,000.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
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        <BookValueAmt>960144</BookValueAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>15112268</OtherCostOrOtherBasisAmt>
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        <BookValueAmt>4516698</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>100613</OtherCostOrOtherBasisAmt>
        <BookValueAmt>100613</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>5577455</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Miscellaneous receivables</Desc>
        <BookValueAmt>55292</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>Due from affiliates</Desc>
        <BookValueAmt>10489996</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>10545288</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Due to affiliates</Desc>
        <Amt>3070353</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>3070353</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>FIN 48 Footnote The Internal Revenue Service has previously determined that the MaineHealth System and its subsidiaries (except Maine Medical Partners (MMP) (a subsidiary of MaineHealth) are organizations as described in Section 501(c)(3) of the Internal Revenue Code (IRC) and are exempt from federal income taxes on related income pursuant to Section 501(a) of the IRC. The MaineHealth System recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount of benefit that is greater than fifty percent likely to be realized upon settlement. Changes in measurement are reflected in the period in which the change in judgment occurs. The MaineHealth System did not recognize the effect of any income tax positions in either 2023 or 2022.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
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      <SupplementalNonqualRtrPlanInd>1</SupplementalNonqualRtrPlanInd>
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      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>1</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Albert G Swallow III</PersonNm>
        <TitleTxt>CFO, MaineHealth/Board Treasurer</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>681149</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>179108</BonusRelatedOrganizationsAmt>
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        <OtherCompensationRltdOrgsAmt>320336</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>84894</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>34626</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1300113</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kelly Elkins</PersonNm>
        <TitleTxt>COO, MaineHealth/Board Chair</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>734790</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>174375</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>191449</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>12200</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>16976</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1129790</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Richard W Petersen</PersonNm>
        <TitleTxt>Fmr President, MH/Fmr Board Chair</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationRltdOrgsAmt>283924</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>6100</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>1081</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>750139</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>William S Schofield</PersonNm>
        <TitleTxt>Former President/Frmr Trustee</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>362858</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <DeferredCompRltdOrgsAmt>78851</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>17810</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>719259</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Richard Olsen</PersonNm>
        <TitleTxt>CFO, SMHC/Trustee</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>15250</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>35626</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>437943</TotalCompensationRltdOrgsAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Joe Grant</PersonNm>
        <TitleTxt>VP Operations, MCHMC/Trustee</TitleTxt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Rebecca Simmons</PersonNm>
        <TitleTxt>Chief Operating Officer</TitleTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Robert Carlson</PersonNm>
        <TitleTxt>Senior Medical Lab Director</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>37600</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>367243</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>James McAvoy</PersonNm>
        <TitleTxt>Chief Financial Officer</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>320593</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Penelope St Louis</PersonNm>
        <TitleTxt>Fmr AVP-Payor Contract,MH/Fmr Sec</TitleTxt>
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        <DeferredCompRltdOrgsAmt>30490</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>18152</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>309228</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sharon D Baughman</PersonNm>
        <TitleTxt>CNO, MaineHealth/Trustee</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>205114</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationRltdOrgsAmt>8190</OtherCompensationRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>7044</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>8115</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>228463</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Nicholas Adler</PersonNm>
        <TitleTxt>Dir - Sales &amp; Marketing</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>30000</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>548</OtherCompensationFilingOrgAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>30673</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>182520</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Heather McCallum</PersonNm>
        <TitleTxt>Lead Med Technician/Med Lab Tech</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>178406</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Cecilie MacIntyre</PersonNm>
        <TitleTxt>Corp Counsel, MH/Board Secretary</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>140670</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>429</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>6022</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>29954</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>177075</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Ronald Rubocki</PersonNm>
        <TitleTxt>Director - HLA</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>168680</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Patricia Andrews</PersonNm>
        <TitleTxt>Former Senior Director - Lab</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Lines 4a-b</FormAndLineReferenceDesc>
        <ExplanationTxt>PENELOPE ST. LOUIS, FORMER AVP - PAYOR CONTRACTING/FORMER BOARD SECRETARY, RECEIVED SEVERANCE PAYMENTS TOTALING $56,572 DURING CALENDAR YEAR 2022 FROM MAINEHEALTH. MID COAST HEALTH MANAGEMENT CORP AND ITS RELATED ORGS HAVE A DEFERRED COMPENSATION ARRANGEMENT UNDER A NON-QUALIFIED DEFINED CONTRIBUTION PLAN TO PROVIDE SUPPLEMENTAL RETIREMENT BENEFITS TO CERTAIN EMPLOYEES. JOE GRANT PARTICIPATED IN THIS PLAN AND RECEIVED $14,752 FROM MID COAST HEALTH MANAGEMENT CORP &amp; SUBS. THIS INDIVIDUAL'S NON-QUALIFIED PLAN CONTRIBUTIONS ARE INCLUDED IN THE FIGURES REPORTED ON SCHEDULE J, PART II, COLUMN B(iii).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINEHEALTH ESTABLISHED A PERFORMANCE INCENTIVE PLAN (THE PLAN) TO ENCOURAGE AND REWARD PLAN PARTICIPANTS FOR ACHIEVING DEFINED PERFORMANCE GOALS THAT ARE SUPPORTIVE OF MAINEHEALTH'S MISSION, STRATEGIC INITIATIVES, AND OPERATING OBJECTIVES. THE PLAN IS ADMINISTERED BY THE MAINEHEALTH COMPENSATION COMMITTEE OF THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V - Additional Information</FormAndLineReferenceDesc>
        <ExplanationTxt>LINE 1A: MAINEHEALTH (EIN 01-0238552), ACTING ON BEHALF OF THE MAINEHEALTH SYSTEM FILED 1,684 FORM 1099S FOR THE CALENDAR YEAR 2022.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V - Additional Information</FormAndLineReferenceDesc>
        <ExplanationTxt>LINE 2A: MAINEHEALTH (EIN 01-0238552), ACTING ON BEHALF OF THE MAINEHEALTH SYSTEM FILED FORM W-3, REPORTING 26,427 EMPLOYEES FOR THE CALENDAR YEAR 2022.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINEHEALTH SERVICES (EIN 01-0431680) IS THE SOLE MEMBER OF NORDX.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINEHEALTH SERVICES SHALL ELECT THE MEMBERS OF THE BOARD OF TRUSTEES AND OFFICERS OF NORDX.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINEHEALTH SERVICES AS THE SOLE MEMBER HAS THE POWER TO APPROVE THE FOLLOWING: OPERATING AND CAPITAL BUDGETS; CAPITAL EXPENDITURES IN EXCESS OF $1,000,000; BORROWINGS IN EXCESS OF $1,000,000; THE SALE OF ANY ASSETS OTHER THAN DISPOSITIONS OF LESS THAN $50,000; ADOPTION OF BUSINESS, MARKETING AND STRATEGIC PLAN; ANY MERGER OR CONSOLIDATION OR CREATION OR ACQUISITION OF SUBSIDIARY ORGANIZATION; THE FILING OF A VOLUNTARY PETITION SEEKING RELIEF OF DEBTORS; THE COMMENCEMENT OF LITIGATION OTHER THAN ROUTINE COLLECTION ACTIONS; DEVELOPING, IMPLEMENTING, OR TERMINATING PROGRAMS OR SERVICES; ENTERING INTO AGREEMENTS FOR MANAGEMENT SERVICES; AND THE ANNUAL SELECTION OF THE PRESIDENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>UPON COMPLETION OF THE DRAFT 990, THE RETURN WAS REVIEWED IN DETAIL BY THE ORGANIZATION'S CFO. SUBSEQUENT TO THE DETAILED REVIEW, THE 990 WAS MADE AVAILABLE TO ALL MEMBERS OF THE BOARD OF TRUSTEES BEFORE BEING SIGNED BY THE CFO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINEHEALTH'S AUDIT &amp; COMPLIANCE SERVICES SENDS CONFLICT OF INTEREST (COI) DISCLOSURE FORM REQUESTS TO OVER 3,000 CARE TEAM MEMBERS (INCLUDING ALL BOARD MEMBERS, OFFICERS, AND OTHER SENIOR LEADERS) EACH YEAR. AUDIT &amp; COMPLIANCE SERVICES COLLECTS THE DISCLOSURE FORMS AND REVIEWS EACH SUBMISSION FOR POSSIBLE REPORTED CONFLICTS TO DETERMINE IF A MANAGEMENT MITIGATION PLAN IS REQUIRED. THE RESULTS OF THE ANNUAL COI PROCESS ARE REPORTED TO THE MAINEHEALTH EXECUTIVE COMPLIANCE COMMITTEE, THE AUDIT COMMITTEE, LOCAL HEALTH SYSTEM PRESIDENTS, AND THE BOARD OF TRUSTEES CHAIRPERSONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION PROCESS FOR PRESIDENTS (LINE 15a) MAINEHEALTH, A RELATED ORGANIZATION USES AN OUTSIDE FIRM, SULLIVAN COTTER, TO PERFORM AN INDEPENDENT BENCHMARK ANALYSIS FOR THE PRESIDENT OF NORDX. THE FIRM MEETS WITH THE EXECUTIVE COMMITTEE OF THE BOARD OF DIRECTORS OF MAINEHEALTH TO REVIEW THE EXECUTIVE COMPENSATION REPORT. THE EXECUTIVE COMMITTEE THEN DELIBERATES ON MAINEHEALTH'S WRITTEN SALARY AND INCENTIVE PLAN PHILOSOPHY BEFORE MAKING A FINAL DECISION. ALL MEETING DECISIONS ARE CAPTURED IN MINUTES WITH APPROPRIATE APPROVALS AT ALL LEVELS. COMPENSATION PROCESS FOR OFFICERS (LINE 15b) COMPENSATION FOR OFFICERS OF NORDX IS PART OF THE INDEPENDENT BENCHMARK ANALYSIS PERFORMED ANNUALLY BY SULLIVAN COTTER. ALL COMPENSATION DECISIONS ARE REVIEWED AND APPROVED BY THE MAINEHEALTH CHIEF EXECUTIVE OFFICER, CHIEF OPERATING OFFICER AND CHIEF PEOPLE OFFICER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>DOCUMENTS THAT ARE REQUIRED TO BE OPEN FOR PUBLIC INSPECTION ARE MADE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Transfer to affiliates -2,500,000.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MaineHealth</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>22 Bramhall Street</AddressLine1Txt>
          <CityNm>Portland</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04102</ZIPCd>
        </USAddress>
        <EIN>010238552</EIN>
        <PrimaryActivitiesTxt>Hospital</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 3</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>MaineHealth Services</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MaineHealth Care at Home</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>15 Industrial Park</AddressLine1Txt>
          <CityNm>Saco</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04072</ZIPCd>
        </USAddress>
        <EIN>222571902</EIN>
        <PrimaryActivitiesTxt>Home health</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>MaineHealth Services</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>The Memorial Hospital</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>3073 White Mountain Highway</AddressLine1Txt>
          <CityNm>North Conway</CityNm>
          <StateAbbreviationCd>NH</StateAbbreviationCd>
          <ZIPCd>03860</ZIPCd>
        </USAddress>
        <EIN>020222156</EIN>
        <PrimaryActivitiesTxt>Hospital</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NH</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 3</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>MaineHealth Services</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MaineHealth Services</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>110 Free Street</AddressLine1Txt>
          <CityNm>Portland</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04101</ZIPCd>
        </USAddress>
        <EIN>010431680</EIN>
        <PrimaryActivitiesTxt>Healthcare</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 12c, III-FI</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>1</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>