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        <FormAndLineReferenceDesc>SCHEDULE D, PART X, LINE 2 FIN 48 (ASC 740) FOOTNOTE</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INTERNAL REVENUE SERVICE HAS DETERMINED THAT SHUC IS A TAX-EXEMPT ORGANIZATION UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. UNDER ASC 740, INCOME TAXES, AN ORGANIZATION MUST RECOGNIZE THE FINANCIAL STATEMENT EFFECTS OF A TAX POSITION TAKEN FOR TAX RETURN PURPOSES WHEN IT IS MORE LIKELY THAN NOT THAT THE POSITION WILL NOT BE SUSTAINED UPON EXAMINATION BY A TAXING AUTHORITY. THE CORPORATION DOES NOT BELIEVE IT HAS TAKEN ANY MATERIAL UNCERTAIN TAX POSITIONS, AND ACCORDINGLY, IT HAS NOT RECORDED ANY LIABILITY FOR UNRECOGNIZED TAX BENEFITS.</ExplanationTxt>
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        <PersonNm>DAVID DRINKWATER MD</PersonNm>
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        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 3 ARRANGEMENT USED TO ESTABLISH THE TOP MANAGEMENT OFFICIAL'S COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S BYLAWS REQUIRE THE VOTING BOARD MEMBERS TO BE THE PRESIDENT AND THE TREASURER OF THE MEMBER AND ONE PHYSICIAN REPRESENTATIVE APPOINTED BY THE MEMBER. THE ORGANIZATION'S SOLE CORPORATE MEMBER SIGNATURE HEALTHCARE CORPORATION ("SHC") HAS BROAD RESERVE POWERS WITH RESPECT TO GOVERNANCE OF THE ORGANIZATION. SHC'S BOARD OF TRUSTEES STANDING COMPENSATION COMMITTEE IS EMPOWERED BY THE GOVERNING DOCUMENTS TO REVIEW AND APPROVE ALL MATTERS PERTAINING TO COMPENSATION AND SHALL REPORT ALL ACTIONS TAKEN BY IT ON THESE MATTERS TO THE SHC BOARD OF TRUSTEES. THE COMPENSATION COMMITTEE SHALL REVIEW AND APPROVE THE OVERALL COMPENSATION PHILOSOPHY FOR THE HOSPITAL PRESIDENT AND CEO, MEMBERS OF THE HOSPITAL SENIOR MANAGEMENT TEAM, PHYSICIAN COMPENSATION FOR SMG AND HOSPITAL CHIEFS OF SERVICE, AND ANY INDIVIDUAL WHO FALLS WITHIN THE INTERNAL REVENUE SERVICE DEFINITION OF A DISQUALIFIED PERSON AND SHALL BE RESPONSIBLE FOR THE GENERAL OVERSIGHT OF ALL COMPENSATION RELATED DECISIONS WITH THE EXCEPTION OF THOSE INDIVIDUALS WHOSE SALARY AND BENEFITS ARE SUBJECT TO COLLECTIVE BARGAINING AGREEMENTS. THE COMMITTEE WILL BE RESPONSIBLE FOR REVIEWING, AT LEAST EVERY THREE YEARS, THE OVERALL COMPENSATION RANGE OF THE HOSPITAL AND ITS AFFILIATES AS COMPARED TO COMPARABLE ORGANIZATIONS AND SHALL ESTABLISH THE GENERAL PERCENTILE FOR AVERAGE COMPENSATION IN MAKING THIS DETERMINATION. THE COMMITTEE SHALL ENGAGE A BENEFIT CONSULTING FIRM TO CONDUCT MARKET ANALYSIS BASED ON THE RECOMMENDATIONS OF THE VICE PRESIDENT OF HUMAN RESOURCES. THE COMMITTEE SHALL HAVE THE POWER TO: APPROVE ALL DETERMINATIONS WITH RESPECT TO COMPENSATION; RETAIN AND TERMINATE A QUALIFIED COMPENSATION CONSULTANT TO ASSIST IN THE ASSESSMENT OF COMPENSATION; AND RETAIN AND TERMINATE LEGAL, ACCOUNTING OR OTHER EXPERTS NECESSARY TO CARRY OUT ITS DUTIES. THE MINUTES OF THE COMPENSATION COMMITTEE SHALL REFLECT THE DELIBERATIONS AND DECISIONS OF THE COMMITTEE WHICH SHALL BE FINAL AND NOT SUBJECT TO FURTHER REVIEW OR APPROVAL. THE MINUTES OF THE COMPENSATION COMMITTEE SHALL REFLECT THE DELIBERATIONS AND DECISIONS OF THE COMMITTEE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 4B SUPPLEMENTAL NONQUALIFIED RETIREMENT PLAN</FormAndLineReferenceDesc>
        <ExplanationTxt>A RELATED ORGANIZATION, SIGNATURE HEALTHCARE MEDICAL GROUP, INC., MAINTAINS A 457(F) NON-QUALIFIED DEFERRED COMPENSATION PLAN FOR ACTIVELY EMPLOYED ELIGIBLE PHYSICIANS. EMPLOYEES WILL BE VESTED IN THE CONTRIBUTION FOR A PLAN YEAR ON JANUARY 1 TEN YEARS FROM THE YEAR IN WHICH EMPLOYEE CONTRIBUTIONS ARE MADE OR ON JANUARY 1 IN THE YEAR IN WHICH THEY REACH THE RETIREMENT AGE OF 65 AND HAVE TWO YEARS OF PLAN SERVICE. NO DISTRIBUTIONS WERE MADE IN FY25.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 6 CLASSES OF MEMBERS OR STOCKHOLDERS</FormAndLineReferenceDesc>
        <ExplanationTxt>SIGNATURE HEALTHCARE CORPORATION ("SHC"), A CHARITABLE ORGANIZATION ORGANIZED UNDER THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS, ACTING THROUGH ITS BOARD OF TRUSTEES, IS THE SOLE CORPORATE MEMBER.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 7A MEMBERS OR STOCKHOLDERS ELECTING MEMBERS OF GOVERNING BODY</FormAndLineReferenceDesc>
        <ExplanationTxt>SHC, A SOLE CORPORATE MEMBER, AND ACTING THROUGH ITS BOARD OF TRUSTEES HAS THE POWER TO APPOINT THE ORGANIZATION'S BOARD OF DIRECTORS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 7B DECISIONS REQUIRING APPROVAL BY MEMBERS OR STOCKHOLDERS</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUTHORITY OF THE ORGANIZATION'S BOARD OF DIRECTORS TO EXERCISE THE FOLLOWING POWERS IS CONDITIONED ON THE PRIOR APPROVAL OF SHC'S BOARD OF TRUSTEES. APPROVE ANY ACTION IMPACTING THE TAX-EXEMPT STATUS OF SHC OR ITS TAX-EXEMPT AFFILIATES, SHC'S CONFORMANCE WITH LAW OR SHC'S POLICIES; APPROVE PROPOSED OPERATING AND CAPITAL BUDGETS AND STRATEGIC PLANS; APPROVE CHANGES IN METHODOLOGY, STRUCTURE OR PHILOSOPHY OF COMPENSATION PAID AND BENEFITS PROVIDED TO PHYSICIANS; APPROVE THE EXECUTION OF, OR AMENDMENTS TO ANY MATERIAL CONTRACTS; APPROVE THE SALE OR CHANGE OF OWNERSHIP OF THE ORGANIZATION' APPROVE SIGNIFICANT ACQUISITIONS OR DISPOSITIONS OF PROPERTY AND APPROVE INCURRING DEBT ON THE PART OF THE ORGANIZATION FOR MONEY BORROWED OR FOR GUARANTYING THE DEBT OF ANOTHER PARTY.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 11B REVIEW OF FORM 990 BY GOVERNING BODY</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S FORM 990 IS PREPARED BY AN OUTSIDE INDEPENDENT CERTIFIED PUBLIC ACCOUNTING FIRM AND IS PRESENTED TO AND REVIEWED BY THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER OF SIGNATURE HEALTHCARE CORPORATION. COPIES OF FORM 990 ARE PROVIDED TO EACH MEMBER OF THE BOARD OF TRUSTEES PRIOR TO FILING WITH THE IRS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 12C CONFLICT OF INTEREST POLICY</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPLETED CONFLICT OF INTEREST QUESTIONNAIRES SHALL BE SUBMITTED TO THE PRESIDENT OR HIS DESIGNEE BY DECEMBER 1ST, PRIOR TO THE BEGINNING OF EACH CALENDAR YEAR. THE PRESIDENT OR HIS DESIGNEE SHALL, IN WRITING, ADVISE MEMBERS (TRUSTEES, SENIOR MANAGEMENT DEPARTMENT MANAGERS AND PHYSICIANS) AND INDIVIDUALS ON THE MEDICAL EXECUTIVE COMMITTEE WHO ARE NOT MEMBERS OF THE CONFLICT-OF-INTEREST POLICY AND REQUEST THAT EACH INDIVIDUAL COMPLETE AND SUBMIT TO THE PRESIDENT OR HIS DESIGNEE, A QUESTIONNAIRE OUTLINING ANY POSSIBLE CONFLICTS OF INTEREST OR INDICATING THAT NO SUCH CONFLICT OF INTEREST EXISTS. THE PRESIDENT OR HIS DESIGNEE SHALL REVIEW ALL CONFLICT-OF-INTEREST QUESTIONNAIRES AND AT LEAST ANNUALLY DISCLOSE TO THE EXECUTIVE COMMITTEE THE RESULTS OF THE QUESTIONNAIRES. AT LEAST ANNUALLY THE PRESIDENT OR HIS DESIGNEE SHALL REQUEST A COMMITTEE OF THE BOARD TO REVIEW STANDARD RELATIONSHIPS WITH LOCAL BANKS, INSURANCE FIRMS, VENDORS AND OTHER ENTITIES SERVING THE INSTITUTION TO ASSURE THAT THE RELATIONSHIP IS IN THE BEST INTEREST OF THE INSTITUTION AND IS OTHERWISE CONSISTENT WITH THE TERMS OF THE CONFLICT-OF-INTEREST POLICY. ANY MEMBER HAVING A POSSIBLE CONFLICT OF INTEREST ON ANY MATTER SHOULD NOT VOTE, USE HIS/HER PERSONAL INFLUENCE OR MAKE AN ADMINISTRATIVE DECISION ON THE MATTER, AND IN THE CASE OF A TRUSTEE, SHOULD NOT BE COUNTED IN DETERMINING THE QUORUM FOR THE ACTION OF THE MATTER. THE MINUTES OF THE MEETING SHOULD REFLECT THAT A FULL AND ACCURATE DISCLOSURE WAS MADE, THAT THE MEMBER ABSTAINED FROM VOTING OR DECISION MAKING AND THE QUORUM OTHERWISE PRESENT. THE CONFLICT-OF-INTEREST POLICY SHALL BE REVIEWED ANNUALLY BY THE MEMBERS AND EACH NEW MEMBER SHALL BE ADVISED OF THE POLICY PRIOR TO THE INDIVIDUAL'S SELECTION AS A MEMBER AND SHALL BE REQUIRED TO FILE WITHIN 30 DAYS THEREAFTER A COMPLETED QUESTIONNAIRE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 18 HOW FORMS ARE MADE AVAILABLE TO THE PUBLIC</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS AVAILABLE FOR PUBLIC INSPECTION ON THE MASSACHUSETTS ATTORNEY GENERAL'S WEBSITE LOCATED AT WWW.MASS.GOV AND UPON REQUEST.</ExplanationTxt>
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        <ExplanationTxt>THE ORGANIZATION'S ARTICLES OF ORGANIZATION ARE OPEN TO THE PUBLIC ON THE MASSACHUSETTS SECRETARY OF STATE'S WEBSITE AND THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST. THE ORGANIZATION'S FINANCIAL STATEMENTS ARE AVAILABLE ON THE MASSACHUSETTS ATTORNEY GENERAL'S WEBSITE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9 OTHER CHANGES IN NET ASSETS OR FUND BALANCES</FormAndLineReferenceDesc>
        <ExplanationTxt>TRANSFERS FROM AFFILIATES - 2168089; TOTAL - 2168089;</ExplanationTxt>
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      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>true</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>false</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>true</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>true</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>false</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>true</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>true</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>