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        <FormAndLineReferenceDesc>PART IV, SECTION D, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>SUPPORTED ORGANIZATIONS HAVE SIGNIFICANT VOICE IN INVESTMENT POLICIES THE HSC FOUNDATION IS THE SOLE CORPORATE MEMBER OF TWO SUPPORTED ORGANIZATIONS: THE HOSPITAL FOR SICK CHILDREN (DBA CHILDREN'S NATIONAL REHABILITATION AND SPECIALIZED CARE, FKA HSC PEDIATRIC CENTER) (RSC) AND HEALTH SERVICES FOR CHILDREN WITH SPECIAL NEEDS (HSCSN). THERE IS IMPORTANT OVERLAP AMONG DIRECTORS AND THE SENIOR LEADERSHIP OF THE FOUNDATION AND RSC AND HSCSN. AS A RESULT, RSC AND HSCSN HAVE A SIGNIFICANT VOICE IN THE HSC FOUNDATION'S INVESTMENT POLICIES AND IN DIRECTING THE USE OF THE HSC FOUNDATION'S INCOME AND ASSETS. IN PARTICULAR, THE OVERLAPPING DIRECTORS AND SENIOR LEADERSHIP ENSURE THAT THE HSC FOUNDATION DIRECTS ITS RESOURCES IN A MANNER THAT DIRECTLY SUPPORTS THE TAX-EXEMPT PURPOSES OF RSC AND HSCSN.</ExplanationTxt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>PART IV, SECTION E, LINE 3A:</FormAndLineReferenceDesc>
        <ExplanationTxt>POWER TO APPOINT/ELECT MAJORITY OF OFFICER/DIRECTOR/TRUSTEE THE BOARD OF CHILDREN'S NATIONAL MEDICAL CENTER DBA CHILDREN'S NATIONAL HAS THE RIGHT TO APPOINT THE HSC FOUNDATION'S BOARD MEMBERS AND THOSE OF HSCSN AND RSC SUBJECT TO THE RECOMMENDATIONS AND APPROVAL OF THE HSC FOUNDATION'S BOARD.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PART IV, SECTION E, LINE 3B:</FormAndLineReferenceDesc>
        <ExplanationTxt>SUBSTANTIAL DIRECTION OVER POLICIES/PROGRAMS/ACTIVITIES THE HSC FOUNDATION IS THE PARENT ENTITY OF ITS TWO SUPPORTED ORGANIZATIONS: RSC (FKA HSCPC) AND HSCSN. IN CONJUNCTION WITH CHILDREN'S NATIONAL, THE HSC FOUNDATION APPOINTS AND REMOVES THE BOARD MEMBERS OF RSC AND HSCSN. IN ADDITION, THERE IS IMPORTANT OVERLAP AMONG THE SENIOR LEADERSHIP OF THE ORGANIZATION AND RSC AND HSCSN. IN CONJUNCTION WITH CHILDREN'S NATIONAL, THE HSC FOUNDATION, AS SOLE CORPORATE MEMBER OF RSC AND HSCSN, ALSO POSSESSES CERTAIN RESERVED POWERS OVER THOSE ENTITIES, INCLUDING THE POWER TO ESTABLISH THE POLICIES AND GOALS OF EACH ORGANIZATION AND APPROVE AMENDMENTS TO GOVERNING DOCUMENTS AND ORGANIZATIONAL BUDGETS. THUS, AS A TYPICAL PARENT ORGANIZATION IN AN INTEGRATED HEALTHCARE SYSTEM, THE ORGANIZATION, ALONG WITH CHILDREN'S NATIONAL, EXERCISES A SUBSTANTIAL DEGREE OF DIRECTION OVER THE POLICIES, PROGRAMS, AND ACTIVITIES OF RSC AND HSCSN, AND HAS A DIRECT ROLE IN GUIDING THE FINANCIAL, OPERATIONAL, AND STRATEGIC DECISION-MAKING OF RSC AND HSCSN. CHILDREN'S NATIONAL IS THE SOLE CORPORATE MEMBER OF THE ORGANIZATION. CHILDREN'S NATIONAL, IN CONJUNCTION WITH THE ORGANIZATION, NOW EXERCISES A SUBSTANTIAL DEGREE OF DIRECTION OVER OF THE POLICIES, PROGRAMS AND ACTIVITIES OF THE HSC FOUNDATION AND ITS SUBSIDIARIES AND HAS A ROLE IN GUIDING THE FINANCIAL, OPERATIONAL, AND STRATEGIC DECISION-MAKING OF THE ORGANIZATION AND ITS SUBSIDIARIES.</ExplanationTxt>
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        <ExplanationTxt>LIABILITY FOR UNCERTAIN TAX POSITIONS (ASC 740) FIN 48 FINANCIAL STATEMENT FOOTNOTE FROM CHILDREN'S NATIONAL MEDICAL CENTER (CHILDREN'S NATIONAL), OF WHICH THE HSC FOUNDATION IS A SUBSIDIARY, IS AS FOLLOWS: CHILDREN'S NATIONAL EVALUATES UNCERTAIN TAX POSITIONS USING A TWO-STEP APPROACH FOR RECOGNIZING AND MEASURING TAX BENEFITS TAKEN OR EXPECTED TO BE TAKEN IN AN UNRELATED BUSINESS ACTIVITY TAX RETURN AND DISCLOSURES REGARDING UNCERTAINTIES IN TAX POSITIONS. THERE WAS NO IMPACT ON CHILDREN'S NATIONAL'S FINANCIAL STATEMENTS DURING THE YEARS ENDED JUNE 30, 2024 AND 2023 AS CHILDREN'S NATIONAL HAS NO UNCERTAIN TAX POSITIONS.</ExplanationTxt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>89381</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>36652</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1059010</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>61769</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NATHANIEL BEERS MD</PersonNm>
        <TitleTxt>PRESIDENT OF HSC</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>511166</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>241822</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>90332</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>97107</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>37391</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>977818</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>65118</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DONNA ANTHONY</PersonNm>
        <TitleTxt>FORMER KEY EMPLOYEE</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>335399</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>81113</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>40216</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>43538</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>31770</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>532036</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>21077</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DEBBIE HOLSON</PersonNm>
        <TitleTxt>FORMER KEY EMPLOYEE</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>263280</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>46113</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>4356</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>13663</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>31585</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>358997</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ABIMBOLA EMMANUEL</PersonNm>
        <TitleTxt>HSCHC COO</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>248510</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>43259</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>660</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11339</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>20583</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>324351</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KIMBERLY BROWN</PersonNm>
        <TitleTxt>FORMER OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>220935</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>37628</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>4356</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>10720</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>10804</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>284443</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION THE HSC FOUNDATION RELIES ON ITS SOLE MEMBER, CHILDREN'S NATIONAL MEDICAL CENTER (DBA CHILDREN'S NATIONAL), TO DETERMINE COMPENSATION FOR HSC FOUNDATION'S PRESIDENT. CHILDREN'S NATIONAL USES AN EXECUTIVE COMPENSATION COMMITTEE, INDEPENDENT COMPENSATION CONSULTANT, COMPENSATION SURVEY OR STUDY, AND APPROVAL BY THE PEOPLE, CULTURE AND COMPENSATION COMMITTEE OF THE BOARD TO ESTABLISH COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 4B:</FormAndLineReferenceDesc>
        <ExplanationTxt>SUPPLEMENTAL NONQUALIFIED RETIREMENT PLAN THE FOLLOWING INDIVIDUALS PARTICIPATED IN A NON-QUALIFIED SUPPLEMENTAL RETIREMENT PLAN. THE CONTRIBUTIONS TO THE SUPPLEMENTAL NON-QUALIFIED RETIREMENT PLAN ARE INCLUDED IN SCHEDULE J, PART II, COLUMN (C) AS PART OF DEFERRED COMPENSATION OR SCHEDULE J, PART II, COLUMN (B) (III) WHEN AMOUNTS ARE DEFERRED AND DISTRIBUTED IN THE SAME CALENDAR YEAR: MARY ANNE HILLIARD $72,881 ALDWIN LINDSAY $106,032 DONNA ANTHONY $27,038 NATHANIEL BEERS, MD $80,607 ADDITIONALLY, THE FOLLOWING INDIVIDUALS RECEIVED DISTRIBUTIONS FROM THE PLAN THAT WERE DEFERRED ON A PREVIOUSLY FILED FORM 990 AND ARE INCLUDED IN SCHEDULE J, PART II, COLUMN (B)(III) AS TAXABLE WAGES IN THE CURRENT YEAR. MARY ANNE HILLIARD $61,769 ALDWIN LIDSAY $82,363 DONNA ANTHONY $21,077 NATHANIEL BEERS, MD $65,118</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1, DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>TO PROVIDE AND COORDINATE INNOVATIVE, HIGH QUALITY, COMMUNITY-BASED CARE FOR INDIVIDUALS WITH COMPLEX NEEDS AND THEIR FAMILIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART V:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FILING ORGANIZATION HAS ENTERED "0" IN PART V, LINE 1A AND LINE 2A BECAUSE THE ORGANIZATION'S 1099 AND W-2 RETURNS ARE FILED BY AND UNDER THE NAME AND EIN OF CHILDREN'S HOSPITAL, INC., A RELATED ENTITY, UNDER A SHARED SERVICES AGREEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OR STOCKHOLDERS CHILDREN'S NATIONAL MEDICAL CENTER (CHILDREN'S NATIONAL) IS THE SOLE CORPORATE MEMBER OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBER'S POWER TO APPOINT ONE OR MORE MEMBERS OF THE GOVERNING BODY EFFECTIVE SEPTEMBER 1, 2019 AND FOR A PERIOD OF FIVE YEARS THEREAFTER, PROVIDED HOWEVER THAT AS OF JULY 2, 2024, THIS ENTITY MERGED INTO ITS SOLE CORPORATE MEMBER, CHILDREN'S NATIONAL, THE MEMBERS OF THE ORGANIZATION'S GOVERNING BODY TOGETHER WITH THE BOARD OF CHILDREN'S NATIONAL APPOINT THE MEMBERS OF THE ORGANIZATION'S GOVERNING BODY. AFTER SEPTEMBER 1, 2024, CHILDREN'S NATIONAL WILL APPOINT MEMBERS OF THE ORGANIZATION'S GOVERNING BODY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBER'S AUTHORITY TO APPROVE CERTAIN GOVERNANCE DECISIONS ON SEPTEMBER 1, 2019, AND BY MEANS OF AN AFFILIATION AGREEMENT, THE ORGANIZATION AFFILIATED WITH CHILDREN'S NATIONAL. EFFECTIVE AS OF THAT DATE, THE ORGANIZATION AMENDED AND RESTATED ITS BYLAWS TO COMPLY WITH CHILDREN'S NATIONAL'S SYSTEM OF GOVERNANCE. UNDER CHILDREN'S NATIONAL'S SYSTEM OF GOVERNANCE, CHILDREN'S NATIONAL RETAINS CERTAIN AUTHORITY OVER SUBSIDIARY ENTITIES. THE RETENTION OF AUTHORITY INCLUDES ITEMS SUCH AS: THE AUTHORITY TO AMEND A SUBSIDIARY'S GOVERNING DOCUMENTS, AUTHORIZATION OF THE SALE OF SUBSTANTIALLY ALL ASSETS, APPOINT/REMOVE OFFICERS AND DIRECTORS, APPROVE BUDGETS, SET SIGNATURE AUTHORITY, AND ADOPT AN ENTERPRISE-WIDE COMPLIANCE PLAN. THE AFFILIATION AGREEMENT AND THE ORGANIZATION'S AMENDED AND RESTATED BYLAWS ANTICIPATE A FIVE-YEAR INTEGRATION PERIOD, DURING SUCH PERIOD THE ORGANIZATION AND CHILDREN'S NATIONAL WILL SHARE RESPONSIBILITY FOR CERTAIN AUTHORITIES THAT ARE OTHERWISE SET UNDER THE SYSTEM OF GOVERNANCE. AFTER SEPTEMBER 1, 2024, CHILDREN'S NATIONAL WILL HAVE SOLE RESPONSIBILITY FOR AUTHORITY THAT IS RESERVED UNDER THE SYSTEM OF GOVERNANCE. AS OF JULY 2, 2024, THIS ENTITY MERGED INTO CHILDREN'S NATIONAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>REVIEW OF FORM 990 BY GOVERNING BODY ONCE THE FORM 990 AND ALL SCHEDULES HAVE BEEN PREPARED BY THE ORGANIZATION'S PROFESSIONAL TAX SERVICES PROVIDER, THE RELEVANT COMMITTEES OF THE ORGANIZATION, ENTITY OPERATIONAL LEADERSHIP, AND FINANCE MANAGEMENT REVIEW APPLICABLE PORTIONS OF THE FORM 990. THE HSC FOUNDATION POSTS A COPY OF THE FORM 990 TO THE HSC FOUNDATION BOARD'S PORTAL PRIOR TO FILING WITH THE IRS. THE COMPLETED FORM 990 IS ALSO MADE AVAILABLE TO THE BOARD OF CHILDREN'S NATIONAL PRIOR TO FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFLICT OF INTEREST POLICY MONITORING &amp; ENFORCEMENT THE HSC FOUNDATION HAS FORMALLY ADOPTED THE CONFLICT OF INTEREST POLICY OF ITS PARENT, CHILDREN'S NATIONAL. CHILDREN'S NATIONAL AND ITS SUBSIDIARIES ASKS THAT EACH OFFICER, DIRECTOR, AND KEY EMPLOYEE COMPLETE A CONFLICT OF INTEREST FORM AT LEAST EVERY YEAR. IN ADDITION, EACH OFFICER, DIRECTOR, AND KEY EMPLOYEE IS INSTRUCTED TO AMEND THE CONFLICT OF INTEREST FORM IMMEDIATELY UPON A CHANGE IN STATUS OF ANY OF THE QUESTIONS ON THE FORM. THESE FORMS ARE REVIEWED ANNUALLY BY THE CHIEF LEGAL OFFICER AND CONFLICTS OF INTEREST ARE NOTED. THE CHILDREN'S NATIONAL BOARD MAKES A DETERMINATION, BASED ON THE RECOMMENDATION OF THE CHIEF LEGAL OFFICER AS TO WHICH PERSONS SHOULD BE CONSIDERED "INTERESTED PARTIES" BASED ON THE CRITERIA SET FORTH IN THE BOARD'S GOVERNANCE POLICY. FORM 990, PART VI, SECTION B, LINES 13 &amp; 14: GOVERNING POLICIES THE HSC FOUNDATION IS GOVERNED BY THE POLICIES OF ITS PARENT, CHILDREN'S NATIONAL. THESE POLICIES INCLUDE A WRITTEN WHISTLEBLOWER POLICY AND A WRITTEN DOCUMENT RETENTION AND DESTRUCTION POLICY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION THE HSC FOUNDATION RELIES ON ITS PARENT, CHILDREN'S NATIONAL, TO DETERMINE COMPENSATION FOR HSC FOUNDATION'S PRESIDENT, OTHER OFFICERS, AND KEY EMPLOYEES. CHILDREN'S NATIONAL USED AN EXECUTIVE COMPENSATION COMMITTEE, INDEPENDENT COMPENSATION CONSULTANT, COMPENSATION SURVEY OR STUDY, AND APPROVAL BY THE PEOPLE, CULTURE, AND COMPENSATION COMMITTEE OF THE BOARD TO ESTABLISH COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>HOW DOCUMENTS ARE MADE AVAILABLE TO THE PUBLIC THE GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE ALL AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VII, SECTION A:</FormAndLineReferenceDesc>
        <ExplanationTxt>FORMER OFFICER, KIMBERLY BROWN, AND FORMER KEY EMPLOYEES, DEBBIE HOLSON AND DONNA ANTHONY, ARE LISTED AS "FORMER" ON PART VII, BUT CONTINUE TO BE EMPLOYED BY CHILDREN'S NATIONAL IN A DIFFERENT CAPACITY. THEY NO LONGER SERVE THE HSC FOUNDATION IN THEIR PRIOR ROLE AS OFFICER OR KEY EMPLOYEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN INVESTMENT OF SUBSIDIARIES -3,643,257.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
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      <IdRelatedTaxExemptOrgGrp>
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          <AddressLine1Txt>1 INVENTA PL 6TH FL W</AddressLine1Txt>
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          <BusinessNameLine1Txt>CHILDREN'S SCHOOL SERVICES</BusinessNameLine1Txt>
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          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>814291601</EIN>
        <PrimaryActivitiesTxt>NURSING SERVICES</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>CNMC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>CHILDREN'S RESEARCH INSTITUTE</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>521654453</EIN>
        <PrimaryActivitiesTxt>RESEARCH</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>LINE 7</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>CNMC</BusinessNameLine1Txt>
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        <RelatedOrganizationName>
          <BusinessNameLine1Txt>CHILDREN'S PEDIATRICIANS AND ASSOCIATES LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>522072589</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>5253 NMTC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>832873855</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>5253 HTC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>833044006</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>54 NMTC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>833358685</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
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      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>54 HTC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>833385522</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>CHILDREN'S NATIONAL HEALTH NETWORK</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVENUE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>521996521</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
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      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BEARACUDA RE</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <ForeignAddress>
          <AddressLine1Txt>PO BOX 69 KY1-1102</AddressLine1Txt>
          <CityNm>GRAND CAYMAN</CityNm>
          <CountryCd>CJ</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>REINSURANCE</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>PEDIATRIC HEALTH NETWORK INC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVENUE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>833415276</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BUILDING 5253 MANAGING MEMBER LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVENUE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>832801690</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BUILDING 54 MANAGING MEMBER LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>111 MICHIGAN AVENUE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20010</ZIPCd>
        </USAddress>
        <EIN>833272918</EIN>
        <PrimaryActivitiesTxt>PROPERTY MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</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>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</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>1</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>THE HOSPITAL FOR SICK CHILDREN</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>S</TransactionTypeTxt>
        <InvolvedAmt>19687949</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH TRANSFER</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>