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    <Timestamp>2012-08-15T05:04:18-05:00</Timestamp>
    <TaxPeriodEndDate>2011-09-30</TaxPeriodEndDate>
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      <Name>
        <BusinessNameLine1>Partners HealthCare System Inc</BusinessNameLine1>
      </Name>
      <NameControl>PART</NameControl>
      <Phone>6177249841</Phone>
      <USAddress>
        <AddressLine1>Prudential Tower</AddressLine1>
        <AddressLine2>800 Boylston Street</AddressLine2>
        <City>Boston</City>
        <State>MA</State>
        <ZIPCode>02199</ZIPCode>
      </USAddress>
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    <Officer>
      <Name>PETER K MARKELL</Name>
      <Title>CFO &amp; Treasurer</Title>
      <DateSigned>2012-08-10</DateSigned>
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    <TaxYear>2010</TaxYear>
    <BuildTS>2016-02-24 21:20:13Z</BuildTS>
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        <RegulatorySafeHarborSatisfied>true</RegulatorySafeHarborSatisfied>
        <GrossProceedsInvested>false</GrossProceedsInvested>
        <ExceptionToRebate>true</ExceptionToRebate>
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        <Identifier>Supplemental Tax Exempt Bond Information</Identifier>
        <ReturnReference>Form 990, Schedule K</ReturnReference>
        <Explanation>See Federal Footnote for Schedule K Part V Supplemental information on tax exempt bonds</Explanation>
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          <NamePerson>L Connors</NamePerson>
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        <Relationship>Family - Connors</Relationship>
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        <DescriptionOfTransaction>Salary-Brigham &amp; Women's Phys.</DescriptionOfTransaction>
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          <NamePerson>D Shtasel</NamePerson>
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        <Relationship>Family - Gottlieb</Relationship>
        <AmountOfTransaction>207747</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Mass General Phys. Org.</DescriptionOfTransaction>
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          <NamePerson>A Moriarty</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Family - Moriarty</Relationship>
        <AmountOfTransaction>147468</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Brigham &amp; Women's Hosp.</DescriptionOfTransaction>
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          <NamePerson>B Miller</NamePerson>
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        <Relationship>Family - Spiess</Relationship>
        <AmountOfTransaction>71657</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-North Shore Medical Ctr</DescriptionOfTransaction>
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          <NamePerson>J Cunningham</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Family - Woo</Relationship>
        <AmountOfTransaction>181984</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Brigham &amp; Women's Phys.</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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          <NamePerson>J Bryant</NamePerson>
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        <Relationship>Family - Woo</Relationship>
        <AmountOfTransaction>213342</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Brigham &amp; Women's Hosp.</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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          <NamePerson>E Woo</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Family - Woo</Relationship>
        <AmountOfTransaction>263116</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Mass General Phys. Org.</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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          <NamePerson>B Woo</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Family - Woo</Relationship>
        <AmountOfTransaction>272158</AmountOfTransaction>
        <DescriptionOfTransaction>Salary-Mass General Phys. Org.</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Covidien</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Connors - Director</Relationship>
        <AmountOfTransaction>23133138</AmountOfTransaction>
        <DescriptionOfTransaction>Health Products</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Bank of America</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Finucane - Officer</Relationship>
        <AmountOfTransaction>8662319</AmountOfTransaction>
        <DescriptionOfTransaction>Banking</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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        <NameOfInterestedPerson>
          <NamePerson>Bank of America</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Gifford - Director</Relationship>
        <AmountOfTransaction>8662319</AmountOfTransaction>
        <DescriptionOfTransaction>Banking</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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        <NameOfInterestedPerson>
          <NamePerson>NSTAR</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Gifford - Director</Relationship>
        <AmountOfTransaction>19770334</AmountOfTransaction>
        <DescriptionOfTransaction>Utilities</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Medicalis</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Holman - Director</Relationship>
        <AmountOfTransaction>386250</AmountOfTransaction>
        <DescriptionOfTransaction>Decision Support</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>CRICO</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Moriarty - Director</Relationship>
        <AmountOfTransaction>87490098</AmountOfTransaction>
        <DescriptionOfTransaction>Insurance</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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          <NamePerson>CRICO</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Minehan - Director</Relationship>
        <AmountOfTransaction>87490098</AmountOfTransaction>
        <DescriptionOfTransaction>Insurance</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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          <NamePerson>CRICO</NamePerson>
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        <Relationship>Pieper - Director</Relationship>
        <AmountOfTransaction>87490098</AmountOfTransaction>
        <DescriptionOfTransaction>Insurance</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
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        <NameOfInterestedPerson>
          <NamePerson>Becton Dickinson Company</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Minehan - Director</Relationship>
        <AmountOfTransaction>15652506</AmountOfTransaction>
        <DescriptionOfTransaction>Medical Supplies</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Eclipsys</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Pieper - Director</Relationship>
        <AmountOfTransaction>1648297</AmountOfTransaction>
        <DescriptionOfTransaction>Products &amp; Services</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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        <NameOfInterestedPerson>
          <NamePerson>Abiomed</NamePerson>
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        <Relationship>Termeer - Director</Relationship>
        <AmountOfTransaction>588103</AmountOfTransaction>
        <DescriptionOfTransaction>Products &amp; Services</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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        <NameOfInterestedPerson>
          <NamePerson>Genzyme</NamePerson>
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        <Relationship>Termeer - Director</Relationship>
        <AmountOfTransaction>3409339</AmountOfTransaction>
        <DescriptionOfTransaction>Products</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Genzyme</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Termeer - Director</Relationship>
        <AmountOfTransaction>230000</AmountOfTransaction>
        <DescriptionOfTransaction>Scientific Meeting Revenue</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>MedSim</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Termeer - Director</Relationship>
        <AmountOfTransaction>143345</AmountOfTransaction>
        <DescriptionOfTransaction>Products &amp; Services</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <GeneralExplanation>
        <Identifier>Statement of Program Service Accomplishments</Identifier>
        <ReturnReference>Form 990, Part III, Line 4a</ReturnReference>
        <Explanation>PARTNERS HEALTHCARE SYSTEM, INC., (PARTNERS) ESTABLISHED IN MARCH 1994, IS THE CORPORATION OVERSEEING THE AFFILIATION OF THE BRIGHAM AND WOMEN'S/FAULKNER HOSPITALS, THE MASSACHUSETTS GENERAL HOSPITAL, THE NORTH SHORE MEDICAL CENTER, AND NEWTON-WELLESLEY HOSPITAL. PARTNERS IS DEVELOPING AN INTEGRATED HEALTH CARE DELIVERY SYSTEM THROUGHOUT THE REGION THAT OFFERS PATIENTS A CONTINUUM OF COORDINATED, HIGH-QUALITY CARE. THE SYSTEM INCLUDES PRIMARY CARE PHYSICIANS AND SPECIALISTS, COMMUNITY HOSPITALS, THE TWO FOUNDING ACADEMIC MEDICAL CENTERS (MGH AND BWH) AND OTHER HEALTH-RELATED ENTITIES. PARTNERS IS CREATING A FRAMEWORK IN WHICH ALL ASPECTS OF THE HEALTH CARE DELIVERY SYSTEM ARE COORDINATED BETWEEN AND AMONG PROVIDERS AND FACILITIES. PARTNERS IMPROVES THE QUALITY OF HEALTH CARE AND FURTHER SERVES THE PUBLIC AT LARGE BY SUPPORTING ITS MEMBER ORGANIZATIONS SO THAT THEY MAY PURSUE THEIR TEACHING AND RESEARCH MISSIONS. THE MEMBER ORGANIZATIONS OF PARTNERS HAVE JOINED TOGETHER IN A COMMITMENT TO SERVE THE COMMUNITY. TOGETHER, THESE ORGANIZATIONS ARE DEDICATED TO ENHANCING PATIENT CARE, TEACHING AND RESEARCH, AND TO TAKING A LEADERSHIP ROLE AS AN INTEGRATED HEALTH CARE SYSTEM. Partners is committed to leading the way in designing integrated patient and family-centered care with the goals of enhancing the quality of patient care and slowing the increase in health care costs. Partners has launched a series of strategic initiatives to redesign care with an emphasis on improving quality and affordability. Multi-disciplinary teams from Partners and from Partners HealthCare hospitals were assembled to develop and implement strategies for change, focusing on the following key areas: Care Redesign: initiatives that seek improvement in patient quality and outcomes while reducing the cost to deliver those outcomes. Patient Affordability: initiatives to manage cost growth and reduce per unit costs in direct patient care and overhead. Additional and ongoing initiatives include the following: Promoting payment systems that support more integrated, patient-centered care. Providing population health management for the sickest patient groups. Delivering safety across the continuum of care. Redesigning primary care. Maximizing the use of new information technology. PLEASE VISIT HTTP://WWW.PARTNERS.ORG/ABOUT/PHILANTHROPY/COMMITMENT-TO-GIVING/DEFAULT.AS PX FOR MORE INFORMATION ABOUT SPECIFIC PARTNERS' PROGRAMS AND INITIATIVES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990 Review</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 11b</ReturnReference>
        <Explanation>The Form 990 was prepared and reviewed by the Partners HealthCare System, Inc. (PHS) Tax Department. Certain key sections were also reviewed by the PHS Executive Vice President of Administration and Finance, CFO and Treasurer; the PHS Vice President of Human Resources and by the PHS General Counsel. The Executive Vice President of Administration and Finance, CFO and Treasurer reviewed and signed the Form 990. The compensation disclosures were presented to and discussed with the PHS Compensation Committee at the May 1, 2012 meeting. The process for preparing and reviewing Form 990 was discussed at the May 9, 2012 meeting of the Audit Committee of the PHS Board of Directors. The final filing version of the Form 990 was provided to each voting Board member prior to filing.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Audited Financial Statements</Identifier>
        <ReturnReference>Form 990, Part XII, Line 2b</ReturnReference>
        <Explanation>The Organization's financial statements are audited by an independent auditor as a part of a consolidated audit of Partners HealthCare System, Inc. and Affiliates. The Partners HealthCare System audit committee of the board assumes oversight for the financial statement audit.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Public Availability of Financial Statements and Governing Documents</Identifier>
        <ReturnReference>Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The Organization's governing documents are filed with Massachusetts Secretary of State and the Financial Statements are filed with Massachusetts Attorney General, all of which are open to public inspection.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Process for Determining Compensation</Identifier>
        <ReturnReference>Form 990, Part VI, Line 15a&amp;b</ReturnReference>
        <Explanation>The organization has a board level compensation committee that reviews and approves the compensation for all listed officers and key employees except the Secretary. The committee is comprised of members of the board who are not employed by the organization, and no member may participate in the review and approval of compensation if the member has a conflict of interest with respect to that compensation arrangement. The committee relies on data, provided by an independent compensation consultant, which includes comparable compensation for similarly qualified persons, in functionally comparable positions, at similarly situated organizations. The deliberations and decisions of the committee are documented in minutes of the meeting. This review process occurs on an annual basis.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Conflict of Interest Policy</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 12c</ReturnReference>
        <Explanation>For purposes of its annual tax filing, Partners HealthCare has an annual questionnaire process for obtaining information on interests that may give rise to conflicts from all officers, directors, trustees and key employees. In addition, in connection with Partners' Conflict of Interest Policy, the Partners Office for Interactions with Industry and Office of General Counsel work together to periodically distribute, collect and review disclosure statements from these individuals. The information on each such disclosure is reviewed by each individual's supervisor (who in the case of directors and trustees is deemed to consist of the Chairman of the Board and the entity's President/CEO, who review the disclosures with the assistance of the General Counsel or attorney representatives of his office). In addition, under the Partners Conflict of Interest Policy, any time an officer, director, trustee, or key employee is aware of a transaction in which his/her interest may create a conflict, he/she is required to provide full disclosure of the interest, and may not be involved in the institutional decision-making about the transaction. In addition, with respect to such transactions, in appropriate circumstances, (i) the Corporation must consider at least two alternative disinterested competitive proposals; or must determine that two such competitive proposals do not exist or that it would be impractical to elicit or consider such competitive proposals; and (ii) the Corporation must determine that, notwithstanding the apparent conflict, the transaction is fair and reasonable to the Corporation and is in the best interests of the Corporation. A written record must be made of these determinations. Furthermore, transactions that present particularly significant conflicts are reviewed by an independent committee of the Partners Board for appropriate action, which review is also documented.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Joint Venture Policy</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 16b</ReturnReference>
        <Explanation>Partners HealthCare System, Inc. and affiliates are currently drafting a written joint venture policy which will safeguard the exempt mission of the organization in any joint venture with taxable entities. The written policy will be implemented during 2012.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Decisions of Governing Body Subject to Member Approval</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Lines 7a&amp;b</ReturnReference>
        <Explanation>Pursuant to the corporate bylaws of the organization, the authority for the following actions is reserved to the members of the organization: - Members shall determine the number of PHS Directors and shall elect PHS Directors. Members may, by a vote, increase the number of PHS directors. Members my decrease the number of PHS Directors, but only to eliminate vacancies existing by reason of the death, resignation or removal of one or more elected PHS Directors. - Members may remove a PHS Director with or without cause by vote. - Members may amend PHS bylaws in whole or in part or may repeal and adopt new bylaws. Members may adopt, amend or repeal any Bylaw, including any Bylaws adopted, amended or repealed by the Directors. Pursuant to the laws of Massachusetts, the authority for the following actions is reserved to the member of the organization: - Amend or restate the Articles of Organization - Consolidation or merger - Sale, lease, exchange or disposition of all or substantially all of the organizations property or assets.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Business and Family Relationships</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 2</ReturnReference>
        <Explanation>CAROL MCMULLEN, PETER MARKELL, STANLEY LUKOWSKI &amp; RICHARD HOLBROOK - BUSINESS RELATIONSHIP G. MARSHALL MORIARTY, CATHY MINEHAN &amp; JAY PIEPER - BUSINESS RELATIONSHIP CHARLES GIFFORD &amp; ANNE FINUCANE - BUSINESS RELATIONSHIP</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Independent Voting Board Members</Identifier>
        <ReturnReference>Part VI, Line 1b</ReturnReference>
        <Explanation>Partners HealthCare System, Inc. seeks to have a Board that is composed of individuals with the requisite expertise and community representation so that it may effectively govern. During this reporting period, some members of the Board, who contribute important expertise and diverse perspective, may have been affiliated with an organization that was involved in a transaction reported on Schedule L. In some instances, these transactions involved essential products and services for which the vendor chosen was a leading national or regional source. Two such vendors are nationally-known suppliers of health-care and/or research-related products; another is a primary regional supplier of electricity. In addition, multiple Board members sit on the Board of our jointly-owned captive liability insurance company. As described on this Schedule O, Partners HealthCare System, Inc. has a conflict of interest policy to address instances where Partners HealthCare System, Inc. may be involved, directly or indirectly, in a transaction with a member of the Board. This policy protects against undue influence by Board members and assists the Board in making decisions that are in the best interests of Partners HealthCare System, Inc.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Other Changes in Net Assets or Fund Balances</Identifier>
        <ReturnReference>Part XI, Line 5</ReturnReference>
        <Explanation>OTHER CHANGES IN NET ASSETS OR FUND BALANCES RELATE TO NET UNREALIZED GAIN/(LOSS) ON INVESTMENTS, CHANGE IN FUNDED STATUS OF DEFINED BENEFIT PLANS, CHANGE IN FAIR VALUE OF HEDGING INTEREST RATE SWAPS, AND OTHER CHANGES IN NET ASSETS.</Explanation>
      </GeneralExplanation>
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          <City>Boston</City>
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          <City>Charlestown</City>
          <State>MA</State>
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        <LegalDomicileState>MA</LegalDomicileState>
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        <LegalDomicileState>MA</LegalDomicileState>
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