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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>508027</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>51634</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>William T Pu MD</PersonNm>
        <TitleTxt>Cardiologist</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>499946</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>119271</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Andrew J Powell MD</PersonNm>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <OtherCompensationAmt>118449</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>8040397</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>84</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Boston Medical Center Health System</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>801 Albany Street 3rd Floor</AddressLine1Txt>
            <CityNm>Boston</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
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      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>621300</BusinessCd>
        <TotalRevenueColumnAmt>66717459</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>66717459</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Clinical and other revenue</Desc>
        <BusinessCd>621990</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>6316647</RelatedOrExemptFuncIncomeAmt>
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        <Desc>Research Revenue</Desc>
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        <RelatedOrExemptFuncIncomeAmt>2845479</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>611710</BusinessCd>
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      <TotalProgramServiceRevenueAmt>77015658</TotalProgramServiceRevenueAmt>
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        <TotalRevenueColumnAmt>122524</TotalRevenueColumnAmt>
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        <ExclusionAmt>94280</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>Non-operating pension gains</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>953447</ExclusionAmt>
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      <OtherRevenueTotalAmt>953447</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>78694629</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>28244</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1047727</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>160209</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>5511897</ProgramServicesAmt>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>1380000</ProgramServicesAmt>
        <ManagementAndGeneralAmt>42529</ManagementAndGeneralAmt>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>20893</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>2391906</ProgramServicesAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>1334349</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <AllOtherExpensesGrp>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <Desc>Due from Boston Children's Hospital</Desc>
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      <OtherAssetsOrgGrp>
        <Desc>Due from Physicians Organization at Children's Hospital, Inc.</Desc>
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        <Desc>Other Receivables</Desc>
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        <Desc>Other Assets</Desc>
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      <OtherLiabilitiesOrgGrp>
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        <ExplanationTxt>Assets limited to use represent assets held in trust that are available to pay for future benefits to participants for deferred compensation benefit plans and investments whose use has been restricted by donors to a specific time period or purpose.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Christina VanderPluym MD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>250863</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>David Kane MD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>230241</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Elizabeth DeWitt MD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>194646</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Boston Children's Heart Foundation, Inc. (the Foundation) established a Tuition Assistance Plan that superseded the previous Tuition Plan effective January 1, 2007. The plan provides annual contribution payments for eligible participants, based on years of membership service to the Foundation and number of children, to a qualified state tuition program described in Section 529 of the Internal Revenue Code 1986 as amended. The plan provides an income tax gross-up equal to 30% of such contributions to assist participants in defraying the cost of income taxes. The Plan provides for a transition for those participants who received benefits under the previous plan, or those who were Foundation members for more than three years and had at least one child who had attained age 14 as of July 1, 2007. These members will not have the same interest accrual advantage as those with younger children, and can elect to have a lump-sum contribution or can elect to have tuition reimbursement up to the amount of tuition established by Harvard University, plus an income tax gross-up based on years of membership service as an Assistant Professor or higher up to a maximum of 34%. The following participated in the plans for September 30, 2023: Kimberly Mills, MD; David Shidlow, MD; Elizabeth DeWitt, MD; David Kane, MD; and Christina VanderPluym, MD. These amounts are included in the recipients' W-2.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>Bonus compensation amounts are determined by the Chief of Boston Children's Heart Foundation, Inc. (the Foundation). The amounts are discretionary based on job performance and on the financial performance of the Foundation.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <LoansBtwnOrgInterestedPrsnGrp>
        <PersonNm>Rahul Rathod MD</PersonNm>
        <RelationshipWithOrgTxt>Director</RelationshipWithOrgTxt>
        <LoanPurposeTxt>Physician Retention</LoanPurposeTxt>
        <LoanFromOrganizationInd>X</LoanFromOrganizationInd>
        <OriginalPrincipalAmt>156000</OriginalPrincipalAmt>
        <BalanceDueAmt>47376</BalanceDueAmt>
        <DefaultInd>0</DefaultInd>
        <BoardOrCommitteeApprovalInd>1</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>1</WrittenAgreementInd>
      </LoansBtwnOrgInterestedPrsnGrp>
      <TotalBalanceDueAmt>47376</TotalBalanceDueAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule L, Part II, Loans to and from Interested Persons:</FormAndLineReferenceDesc>
        <ExplanationTxt>Boston Children's Heart Foundation, Inc. (the Foundation) has provided several secured and unsecured loans to employees. The loans bear interest at rates up to 4.89%. The loans were made for recruitment and retention purposes, to assist physician employees in the purchase of their primary residence. The amounts for the recruitment loans were determined by restricted donations provided by Boston Children's Hospital for use in recruitment. The loans will be forgiven over the terms of the notes if the recipients remain employed at the Foundation or its affiliates. The amount of the loan forgiveness will be included with accrued interest, if applicable, as compensation in the year forgiven. The balance of the loans outstanding are $2,608,147 at September 30, 2023. Future principal amounts due are as follows: $762,530 in 2024; $798,603 in 2025; $501,422 in 2026; $127,090 in 2027; $68,702 in 2028; and $349,800 thereafter.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>A majority of Boston Children's Heart Foundation, Inc.'s (the Foundation's) board members are physicians who are not independent from the Foundation. However, the Foundation is part of an integrated delivery system with Boston Children's Hospital (the Hospital) which does have a community board. The Foundation was organized in 1983. At that time, the board was composed entirely of physicians, a board structure that was approved by the Internal Revenue Service. The Foundation has since adjusted the board structure to make it more responsive to the Hospital by adding the Physicians Organization at Children's Hospital Inc. (the PO) as a member. See Schedule O, Part VI, Questions 3, 6, 7b, and 12 for more details on the PO's rights.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The Physicians Organization at Children's Hospital, Inc. (the PO) is the Class "C" member of Boston Children's Heart Foundation, Inc. (the Foundation). The PO is responsible for providing management services to the Foundation. The PO has the power to approve the independent auditor and legal counsel of the Foundation from an approved list of firms mutually agreed to by the PO and the Foundation. The PO also has the right to review the annual budgets and review and approve the by-law changes of the Foundation. Lastly, Boston Children's Hospital has the right to review for compliance with applicable law, the general terms of and any modification to physician compensation and benefit plans for all physician employees of the Foundation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Boston Children's Heart Foundation, Inc. (the Foundation) has three classes of members. The Chief of the Department of Cardiology (the Chief) of Boston Children's Hospital (the Hospital) is the Class "A" member. Any member (other than the Chief) who holds a medical staff appointment from the Hospital, a full-time faculty appointment in cardiology from Harvard Medical School, and who is geographically full-time at the Hospital shall be a Class "B" member. The Physicians Organization at Children's Hospital, Inc. is the Class "C" member of the Foundation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cardiologist-in-Chief of Boston Children's Hospital (the Hospital) is the Class "A" member of Boston Children's Heart Foundation, Inc. (the Foundation). Every member of the Foundation who holds a medical staff appointment from the Hospital, has a full-time faculty appointment under the auspices of the Cardiologist-in-Chief from Harvard University Medical School, and who practices medicine primarily at the Hospital, shall be a Class "B" member. According to the Articles of Organization, the Class "A and "B" members appoint/elect the board members of the Foundation at the annual meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Physicians Organization at Children's Hospital, Inc. (the PO) is the Class "C" member of Boston Children's Heart Foundation, Inc. (the Foundation). The PO is responsible for providing management services to the Foundation. The PO has the power to approve the independent auditor and legal counsel of the Foundation from an approved list of firms mutually agreed to by the PO and the Foundation. The PO also has the right to review the annual budgets and review and approve the by-law changes of the Foundation. Lastly, Boston Children's Hospital has the right to review for compliance with applicable laws, the general terms of and any modification to physician compensation and benefit plans for all physician employees of the Foundation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The detailed review will be conducted by the President of the Foundation, Tal Geva, MD; the administrator, Marissa Densmore; and the financial reporting manager, Joseph Cantlin. A copy of Form 990 will be available to the board. The detailed review will be conducted before filing the return with the Internal Revenue Service.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Physicians Organization at Children's Hospital, Inc. (the PO) and Boston Children's Hospital (the Hospital) administer an annual conflict of interest disclosure process to all of its member Foundations, which asks physicians (officers, top management, and highly compensated employees) and selected Foundation staff to disclose potential conflicts. A disclosure statement will be circulated annually to members of the PO. The audit committee shall determine those individuals (including medical staff members) who shall be required to complete the disclosure statement. The audit committee, at its discretion, may either: 1) refer any or all disclosure statements to the Board of Directors; 2) appoint an ad hoc committee to review and resolve any conflict of interest issues; or 3) review and resolve any conflict of interest issues personally or through a designee(s). Any person not receiving a disclosure statement nevertheless has an affirmative obligation to disclose to the PO President, PO General Counsel, or his/her supervisor whenever he/she believes he/she has or may have a conflict of interest. Similarly, each person completing a disclosure statement has an affirmative obligation to update the statement any time circumstances change and/or he/she believes that a conflict of interest may exist. In the event a conflict of interest is found to exist, the Foundation prohibits the member from voting on any matter to which the conflict relates or otherwise influence the voting on such matter.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Faculty compensation must comply with the Boston Children's Hospital (the Hospital) Physician Compensation Guidelines. These guidelines are developed in consultation with an independent external compensation consulting firm and are approved by the independent Compensation Committee of the Board of Children's Medical Center Corporation and the Hospital. The guidelines set the maximum compensation limits based on a peer group analysis for Boston Children's Heart Foundation, Inc. (the Foundation). The maximum compensation limits are based on pediatric specialty, sub-specialty, academic rank and approved by the independent Compensation Committee of the Board of the Hospital. Annual compensation for individual faculty members is set by the President of the Foundation, reviewed and approved by the Foundation in accordance with the Foundation's compensation policies and procedures. The Foundation's President's compensation is reviewed and approved annually on a prospective basis by the Hospital's President/Chief Executive Officer.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation maintains all financial records, conflict of interest policies, and governing documents at its main office at 300 Longwood Avenue, Boston, MA 02115. The documents are available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Pension adjustment 2,813,624.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>The audit process and scope has not changed from the prior year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <BusinessNameLine1Txt>Boston Children's Hospital</BusinessNameLine1Txt>
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          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
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        <PrimaryActivitiesTxt>Management services</PrimaryActivitiesTxt>
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        <PublicCharityStatusTxt>Line 12c, III-FI</PublicCharityStatusTxt>
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</Return>