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        <PersonNm>Cynthia Sierra</PersonNm>
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        <PersonNm>Charles Williams MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jason Worcester MD</PersonNm>
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        <PersonNm>Azzie Young</PersonNm>
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        <PersonNm>William Creevy MD</PersonNm>
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        <PersonNm>David Beck</PersonNm>
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        <CurrentTaxYearMinus3YearsAmt>89506</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>182599</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2064751</CurrentTaxYearAmt>
        <TotalAmt>2336856</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <First5Years509Ind>X</First5Years509Ind>
      <PublicSupportCY509Pct>0.00000</PublicSupportCY509Pct>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="IRS990ScheduleD">
      <ArtPublicExhibitionAmountsGrp />
      <HeldWorksArtGrp />
      <CYMinus3YrEndwmtFundGrp />
      <CYMinus4YrEndwmtFundGrp />
      <LandGrp />
      <BuildingsGrp />
      <LeaseholdImprovementsGrp />
      <EquipmentGrp />
      <OtherLandBuildingsGrp />
      <FederalIncomeTaxLiabilityAmt>0</FederalIncomeTaxLiabilityAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DUE TO BMC</Desc>
        <Amt>119484</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DUE TO BMC MSO</Desc>
        <Amt>14456</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DUE TO BMCHS</Desc>
        <Amt>820407</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>MANAGED CARE RISK CONTRACTS</Desc>
        <Amt>606333</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>RESERVE FOR CONTRACT LOSSES</Desc>
        <Amt>2608943</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>4169623</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART X, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The Health System Corporation, the Medical Center, BMCHP, UDF, ECMF, BUAP, Faculty and the Plans, BACO, BMCICS, and BMCIC of Vermont are all nonprofit corporations that have been recognized as tax-exempt pursuant to Section 501(C)(3) of the Internal revenue Code. The shareholders of NAB are nonprofit, tax-exempt corporations. The Health System recognized tax positions when it is more-likely than-not that the positions will be sustainable based on the merits of the position. Management has concluded that there are not material uncertain tax positions that need to be recorded as of September 30, 2018 and 2017. The Health System annually assesses whether it must recognize an unrelated business income tax expense (UBIT). The amounts recognized as UBIT expense were not material to the Health Systems consolidated operations or changes in net assets for the years ended September 30, 2018 and 2017.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1 &amp; PART III, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>BOSTON ACCOUNTABLE CARE ORGANIZATION, INC. (BACO) SHALL AT ALL TIMES BE ORGANIZED AND OPERATED EXCLUSIVELY FOR CHARITABLE, EDUCATIONAL AND/OR SCIENTIFIC PURPOSES WITHIN THE MEANING OF SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. THE MISSION OF BACO IS TO IMPROVE THE HEALTHCARE OF THE POPULATIONS THAT BOSTON MEDICAL CENTER CORPORATION (BMC), THE FACULTY PRACTICE FOUNDATION, INC. (FPF) PHYSICIANS, AND COMMUNITY HEALTH CENTERS (CHCS) SERVE. TO PROVIDE THE BEST CARE POSSIBLE, AN ACCOUNTABLE CARE ORGANIZATION (ACO) IS DESIGNED TO BETTER MANAGE ALL ASPECTS OF HEALTHCARE, IN AN EFFORT TO IMPROVE THE HEALTH OF THE POPULATION SERVED WHILE OPERATING MORE EFFICIENTLY. BACO WILL INTEGRATE THE RESOURCES OF BMC, THE FPF, AND THE CHCS TO PROVIDE MORE EFFECTIVE, HIGHER QUALITY AND LESS EXPENSIVE CARE FOR PATIENTS OF BACO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>CERTAIN OFFICERS AND DIRECTORS OF BACO ALSO SERVE AS OFFICERS AND DIRECTORS OF BMC. BUSINESS RELATIONSHIPS - CHRISTOPHER BRANDON, CHERYL BARTLETT, FRANCIS DOYLE, SPIROS HATIRAS, MICHELLE NADOW, NANCY PAULL, AMY PFEFFER, CYNTHIA SIERRA, CHARLES WILLIAMS, AZZIE YOUNG, ALASTAIR BELL, RAVIN DAVIDOFF, STANLEY HOCHBERG, AND THEA JAMES, ARE EMPLOYEES OF BMC AND BARRY BOCK, WILLIAM J. HALPIN JR, AND SANDRA COTTERELL ARE TRUSTEES OF BMC WHERE DAVID BECK AND CHARLES ORLANDO SERVES AS OFFICERS. BUSINESS RELATIONSHIPS - DAVID HENDERSON, JONATHAN OLSHAKER, PAUL HENDESSI, AND WILLIAM R. CREEVY ARE ALL EMPLOYED PHYSICIANS OF THE FACULTY PRACTICE PLANS WHERE DAVID BECK SERVES AS AN OFFICER OF THE PLANS. BUSINESS RELATIONSHIPS - ALICE JACOBS, LAUREN NENTWICH, JASON WORCESTER ARE EMPLOYEES OF Faculty Practice Foundation, Inc., William Creevy serves as a trustee and officer of Faculty Practice Foundation, Inc., where David Beck also serves as an officer. BUSINESS RELATIONSHIPS - DAVID BECK, WILLIAM CREEVY, CHARLES ORLANDO, SANDRA COTTERELL EACH SERVES AS AN OFFICER AND/OR DIRECTOR OF BMS HEALTH SYSTEM. BUSINESS RELATIONSHIP - DAVID BECK AND SANDRA COTTERELL EACH SERVES AS AN OFFICER AND/OR DIRECTOR OF BOSTON MEDICAL SYSTEM HEALTH PLAN. BUSINESS RELATIONSHIP - DAVID BECK AND RAVIN DAVIDOFF EACH SERVES AS OFFICERS/TRUSTEE OF BOSTON UNIVERSITY AFFILIATED PHYSICIANS, INC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOLLOWING ORGANIZATIONS HAVE THE POWER TO APPOINT DIRECTORS TO THE BACO BOARD: 1. BOSTON MEDICAL CENTER CORPORATION SHALL APPOINT (6) DIRECTORS; 2. FACULTY PRACTICE FOUNDATION, INC. SHALL APPOINT (6) DIRECTORS; 3. PARTICIPATING COMMUNITY HEALTH CENTERS WILL APPOINT A TOTAL OF (6) DIRECTORS; AND 4. BACO'S PATIENT ADVISORY COMITTEE SHALL APPOINT ONE (1) CONSUMER REPRESENTATIVE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>BACO'S FORM 990 IS PREPARED BY KPMG AND REVIEWED BY BMC'S INTERNAL MANAGEMENT. FOLLOWING THAT REVIEW, BMC'S INTERNAL MANAGEMENT AND KPMG PRESENT THE FORM 990 TO THE BMC AUDIT COMMITTEE FOR REVIEW AND COMMENT. THE COMPLETED FORM 990 IS PROVIDED TO ALL MEMBERS OF THE BOARD OF DIRECTORS PRIOR TO THE FORM BEING FILED WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFLICT OF INTEREST QUESTIONAIRES FOR THE FISCAL YEAR END SEPTEMBER 30, 2018 WERE DISTRIBUTED BY BOSTON MEDICAL CENTER'S ("BMC"), AN AFFILIATED ORGANIZATION, CORPORATE COMPLIANCE DEPARTMENT. THE CHIEF COMPLIANCE OFFICER OF BMC OR HER DESIGNEE QUERIES TRUSTEES, OFFICERS AND DIRECTORS ON AT LEAST AN ANNUAL BASIS REGARDING RELATIONSHIPS THAT MAY CREATE POTENTIAL CONFLICTS OF INTEREST. THE CHIEF COMPLIANCE OFFICER OR HER DESIGNEE REVIEWS ALL DISCLOSURES AND DETERMINES WHETHER THERE ARE ACTUAL OR POTENTIAL CONFLICTS OF INTEREST. THE CHIEF COMPLIANCE OFFICER OR HER DESIGNEE INFORMS THE CHIEF LEGAL COUNSEL OF ANY ACTUAL OR POTENTIAL CONFLICTS OF INTEREST. THE CHIEF LEGAL COUNSEL ADVISES THE BOARD OF TRUSTEES AND OFFICERS OF THE CORPORATION ACCORDINGLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>BACO DOES NOT MAKE ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, OR FINANCIAL STATEMENTS PUBLICLY AVAILABLE. HOWEVER, THE ARTICLES OF THE ORGANIZATION ARE POSTED ON THE SECRETARY OF THE COMMONWEALTH'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Transafer from Affiliate - Boston Medical Center $4,300,000</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>