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        <Desc>Prepaids</Desc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>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>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Lugene Inzana</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jennifer McCarthy</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jon Kevin Griffin</PersonNm>
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        <BonusRelatedOrganizationsAmt>93480</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
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        <PersonNm>Beth A Kelsch</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, line 1a:</FormAndLineReferenceDesc>
        <ExplanationTxt>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, line 2a:</FormAndLineReferenceDesc>
        <ExplanationTxt>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 (EIN 01-0238552) is the sole member of MMC Realty.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>MaineHealth as the Member shall elect the Trustees and Officers of MMC Realty.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>MaineHealth as the Member shall have the power to elect the Board of Trustees and officers of MMC Realty; to amend the Articles of Incorporation; to amend the bylaws; and to exercise such other powers as may be conferred on the Member by law, the Articles of Incorporation, or the By Laws of MMC Realty.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Treasurer reviewed the Form 990 in detail before signing the return. The Form 990 was made available to the full board before it was filed.</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 top management official and officers of the organization (Lines 15a and 15b) MaineHealth, a related organization, uses an outside firm, Sullivan Cotter, to perform an independent benchmark analysis for the board president and other company officers. The firm meets with the Executive Committee of the Board of Directors to review the executive benchmark 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.</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>
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          <AddressLine1Txt>22 Bramhall Street</AddressLine1Txt>
          <CityNm>Portland</CityNm>
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          <AddressLine1Txt>110 Free Street</AddressLine1Txt>
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          <AddressLine1Txt>131 Franklin Health Commons</AddressLine1Txt>
          <CityNm>Farmington</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04938</ZIPCd>
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        <PublicCharityStatusTxt>Line 7</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>Western Maine Multi-Medical Specialists</BusinessNameLine1Txt>
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          <StateAbbreviationCd>ME</StateAbbreviationCd>
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          <BusinessNameLine1Txt>Western Maine Nursing Home Inc</BusinessNameLine1Txt>
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          <CityNm>Norway</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
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        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>Line 10</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>Community Health and Nursing Services</BusinessNameLine1Txt>
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          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04011</ZIPCd>
        </USAddress>
        <EIN>010211546</EIN>
        <PrimaryActivitiesTxt>Home health</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>MaineHealth</BusinessNameLine1Txt>
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        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>Mid Coast Geriatric Services Corporation</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>123 Medical Center Drive</AddressLine1Txt>
          <CityNm>Brunswick</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04011</ZIPCd>
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        <PrimaryActivitiesTxt>Home health</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>Maine Medical Partners</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>22 Bramhall Street</AddressLine1Txt>
          <CityNm>Portland</CityNm>
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          <ZIPCd>04102</ZIPCd>
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        <EIN>010442142</EIN>
        <PrimaryActivitiesTxt>Healthcare</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>PBH Management Company</BusinessNameLine1Txt>
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          <AddressLine1Txt>PO Box 287</AddressLine1Txt>
          <CityNm>Belfast</CityNm>
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      <IdRelatedOrgTxblCorpTrGrp>
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          <ZIPCd>04011</ZIPCd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>Mid Coast Medical Group</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>123 Medical Center Drive</AddressLine1Txt>
          <CityNm>Brunswick</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04011</ZIPCd>
        </USAddress>
        <EIN>010484592</EIN>
        <PrimaryActivitiesTxt>Healthcare</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
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      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>Thorton Oaks Development Corp</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>123 Medical Center Drive</AddressLine1Txt>
          <CityNm>Brunswick</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04011</ZIPCd>
        </USAddress>
        <EIN>010448411</EIN>
        <PrimaryActivitiesTxt>Management services</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>1</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>1</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>