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      <FootnoteTextInd>X</FootnoteTextInd>
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        <ExplanationTxt>The endowment funds represent assets held in trust that are available to pay for future benefits to participants for a deferred compensation benefit plan 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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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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        <PersonNm>Mary Whitman MD PhD</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Joseph F Griffith MD</PersonNm>
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        <PersonNm>Eric D Gaier MD PhD</PersonNm>
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        <TotalCompensationFilingOrgAmt>369419</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Benjamin G Jastrzembski MD</PersonNm>
        <TitleTxt>Physician</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Carolyn Graeber MD</PersonNm>
        <TitleTxt>Physician</TitleTxt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Gordon Massey</PersonNm>
        <TitleTxt>COO</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Suzanne Johnston MD MPH</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 1b</FormAndLineReferenceDesc>
        <ExplanationTxt>For those eligible employees, Children's Hospital Ophthalmology Foundation, Inc. (the Foundation) offers gross-up payments for certain benefits that need to be included as taxable income to the employees. Although a written policy does not exist, these payments are communicated to the employees during the initial employment process by the President and Executive Director. All Boston Children's Hospital employees are eligible (those receiving W-2's). The Foundation hosts an alumni retreat biennially, in which it reimburses travel costs for employees and their respective guests. Reimbursements are included as taxable income on the employees' W-2.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Effective December 15, 2015, the Foundation established a 457(f) plan to provide benefits to certain eligible employees whose ability to make elective deferrals under Code Section 403(b) is eliminated or impaired as determined by the Administrator. Non-elective contributions are made by the employer for the participant. Investments are held in trust. During the year ended September 30, 2021, there were no contributions made to the plan.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>The total bonus pool for each fiscal year is built into the yearly budgets and approved by the Board of Directors. This approved bonus pool is distributed to both the leased staff and the physicians. All bonuses are discretionary. The bonus is not a division of earnings of Children's Hospital Ophthalmology Foundation, Inc. (the Foundation). The Ophthalmologist-in-Chief determines a bonus pool based on available funds and then allocates the bonus pool based on the contributions of each professional employee taking into account a variety of factors, including clinical and research contributions, academic performance, and quality services. The Foundation ensures that the total compensation does not exceed the fair market value (FMV) and Reasonableness Maximum compensation upper limits as defined in the Guidelines for Employed Physician and Affiliated Physician Foundation Compensation and Oversight Requirements as set by Boston Children's Hospital.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>Children's Ophthalmology PC</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Dr. Hunter is the 100% owner of COPC</RelationshipDescriptionTxt>
        <TransactionAmt>514875</TransactionAmt>
        <TransactionDesc>Investment</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule L, Part IV:</FormAndLineReferenceDesc>
        <ExplanationTxt>In December 2016, the Foundation Board approved an investment in a new Management Services Organization (MSO), Children's Ophthalmology Management Services, LLC, which is intended to provide a full level of non-clinical services support in New York. The Foundation is the sole owner of the MSO. The entity will provide services to Children's Ophthalmology, PC (COPC) whose owner is the Foundation President. COPC will be located in the region of New York where Boston Children's Health Physicians has its 60+ locations and approximately 300 pediatric primary care and specialty physicians. COPC began providing ophthalmology services to patients during the Foundation's fiscal year 2018.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>A majority of Children's Hospital Ophthalmology Foundation, Inc.'s (the Foundation's) board members are physicians who are not independent from the Foundation because they are compensated by the Foundation. However, the Foundation participates in an integrated delivery system with Boston Children's Hospital (the Hospital) which does have a community board. The Foundation was organized in 2003. 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 a Class "C" member of Children's Hospital Ophthalmology Foundation, Inc. (the Foundation). The PO is responsible for providing certain management services to the Foundation. The PO has the power to approve the independent auditor and legal counsel of the Foundation from a list of firms mutually agreed to by the PO and the Foundation. The PO also has the right to review, but not approve, the annual operating budget. The PO Board has the right to approve 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 modifications to the 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>Children's Hospital Ophthalmology Foundation, Inc. (the Foundation) has 4 classes of members. The Ophthalmologist-in-Chief shall be the sole Class "A" member. Any other member of the Foundation who has, for at least three years, been a physician-employee of the Foundation with an active medical staff appointment from Boston Children's Hospital (the Hospital) and has a faculty appointment at the rank of instructor or above in the Department of Ophthalmology at Harvard Medical School (Harvard) shall be a Class "B" member. Any other physician-employee of the Foundation with an active medical staff appointment from the Hospital and a faculty appointment at the rank of instructor or above in the Department of Ophthalmology at Harvard shall be a Class "D" member. Each Class "A", "B", and "D" member shall hold membership as long as he/she remains qualified for membership. The Physicians Organization at Children's Hospital, Inc. shall be the sole Class "C" member. The qualifications and rights of members, including voting rights, shall be as set forth from time to time in the by-laws of the Foundation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>According to the by-laws, the initial Trustees shall be those individuals named in the Children's Hospital Ophthalmology Foundation, Inc.'s (the Foundation's) Articles of Organization who shall serve until the first annual meeting of the members. Thereafter, the Board of Trustees shall consist of the Class "A and "B" members, each of whom shall serve ex-officio with vote. The Class "A" member is the President of the Foundation. All other officers shall be elected by the Trustees for two-year terms at the Foundation's annual meeting. All officers shall be Trustees.</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 a Class "C" member of Children's Hospital Ophthalmology Foundation, Inc. (the Foundation). The PO is responsible for providing certain management services to the Foundation. The PO has the power to approve the independent auditor and legal counsel of the Foundation from a list of firms mutually agreed upon by the PO and the Foundation. The PO has the right to review, but not to approve, the annual operating budget. The PO Board has the right to approve 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 modifications to physician compensation and benefit plans for all physician employees of the Foundation. As a Class "C" member of the Foundation, the PO attends the Foundation's annual meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The tax return is prepared with information, data, and detail provided by the President of the Foundation, the Executive Director, and the Controller and is reviewed by a representative from the tax preparation firm. The full Form 990 filing is reviewed by the President of the Foundation, the Executive Director, and the Controller prior to filing. It is reviewed by an officer of the corporation and/or the officer who will sign the Form 990. A representative from a tax preparation firm will present a summary of the Form 990 filing to a quorum of the Finance Committee, with Class C member or staff representative from the Physicians Organization at Children's Hospital, Inc. invited for that summary. The Form 990 that was presented to and approved by a quorum of the Finance Committee will be provided to the Foundation's Board of Directors in a subsequent Board meeting packet along with a copy of the Form 990 (with salaries redacted).</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 administer an annual conflict of interest disclosure process to all of their 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 to 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 Physician Compensation Guidelines. These guidelines are developed in consultation with an independent external compensation consulting firm and are approved by independent Compensation Committee of Board of Children's Medical Center Corporation and Boston Children's Hospital. The guidelines set the maximum compensation limits based on a peer group analysis for the Foundations. The maximum compensation limits are based on pediatric specialty, sub-specialty, academic rank and include a productivity adjustment. Any proposed compensation that exceeds the limit must be prospectively approved by the independent Compensation Committee of the Board of the Hospital. Annual compensation for individual faculty members is set by the President of each 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 Boston Children's Hospital President/Chief Executive Officer. Form 990, Part VI, Section B, Line 16a: In January 2007, Children's Hospital Ophthalmology Foundation, Inc. (the Foundation) formed a for-profit limited liability company, Foundation Optical, LLC, to establish a retail optical shop located within a Boston Children's Hospital satellite location. The primary purpose of Foundation Optical, LLC is to offer eyewear needs to patients of the Foundation. The Foundation is the majority owner of Foundation Optical, LLC with a 55% ownership interest. Form 990, Part VI, Section B, Line 16b: It is the policy of Children's Hospital Ophthalmology Foundation, Inc. (the Foundation) to retain an ownership stake in any entity that is consistent with its charitable mission. Further, if the Foundation does retain an ownership stake in any appropriate entity, it will secure legal advice and language in any such operating agreements to ensure it has full authority to prevent and override any action of such entity that the Foundation may determine is inconsistent with its charitable purposes or that may jeopardize the Foundation's tax-exempt status.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation maintains or has access to all financial statements, 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 XII, Line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>The audit process and scope have not changed from the prior year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Children's Ophthalmology Management Services LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>40 Saw Mill River Road Upper Level</AddressLine1Txt>
          <CityNm>Hawthorne</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10532</ZIPCd>
        </USAddress>
        <EIN>820621893</EIN>
        <PrimaryActivitiesTxt>Management Service Organization</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <TotalIncomeAmt>-136857</TotalIncomeAmt>
        <EndOfYearAssetsAmt>1620651</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>Children's Hospital Ophthalmology Foundation Inc</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Boston Children's Hospital</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>042774441</EIN>
        <PrimaryActivitiesTxt>Hospital</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 3</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Physicians Organization at Children's Hospital Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>043266103</EIN>
        <PrimaryActivitiesTxt>Management services</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 12c, III-FI</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>Foundation Optical LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>9 Hope Avenue</AddressLine1Txt>
          <CityNm>Waltham</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02453</ZIPCd>
        </USAddress>
        <EIN>208236402</EIN>
        <PrimaryActivitiesTxt>Eyeglass Sales</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>Children's Hospital Ophthalmology Foundation Inc</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>Related</PredominantIncomeTypeTxt>
        <ShareOfTotalIncomeAmt>94033</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>80469</ShareOfEOYAssetsAmt>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <UBICodeVAmt>18812</UBICodeVAmt>
        <GeneralOrManagingPartnerInd>1</GeneralOrManagingPartnerInd>
        <OwnershipPct>0.55000</OwnershipPct>
      </IdRelatedOrgTxblPartnershipGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>1</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>1</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>Foundation Optical LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>S</TransactionTypeTxt>
        <InvolvedAmt>89356</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>Actual per books</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
