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        <PersonNm>EDWARD J WEISS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KENNETH D ROBERTS</PersonNm>
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        <PersonNm>JOSEPH WISNOSKI</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOAN C FARO</PersonNm>
        <TitleTxt>Chief Medical Officer</TitleTxt>
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        <PersonNm>KEVIN J MURRAY</PersonNm>
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        <PersonNm>WAYNE S SHATTES</PersonNm>
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        <PersonNm>MARIE E MULLIGAN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>YUVAL HILTZIK</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NICK PATEL</PersonNm>
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        <PersonNm>SYED HUSSAINI</PersonNm>
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        <PersonNm>KEITH HARRIS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PETER OTTAVIO</PersonNm>
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          <BusinessName>
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          <USAddress>
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      <ContractorCompensationGrp>
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            <BusinessNameLine1Txt>STONY BROOK MEDICINE -</BusinessNameLine1Txt>
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          <USAddress>
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      <ContractorCompensationGrp>
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      <ContractorCompensationGrp>
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          <BusinessName>
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          <USAddress>
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      <ContractorCompensationGrp>
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          <USAddress>
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      <TotLiabNetAssetsFundBalanceGrp>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
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      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
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        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
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      <HospitalInd>X</HospitalInd>
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        <FormAndLineReferenceDesc>Part II-B, Line 1i - Other Activities Description</FormAndLineReferenceDesc>
        <ExplanationTxt>The Hospital pays membership dues to four organizations; Long Island Health Network, Nassau-Suffolk Hospital Council, Healthcare Association of New York State, and the American Hospital Association. A portion of those dues have been allocated to lobbying expenditures.</ExplanationTxt>
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        <Desc>INTEREST IN NET ASSETS JTMHFF</Desc>
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        <Desc>OTHER ASSETS</Desc>
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        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>The endowment funds are used to improve the quality of the lives of those served by John T. Mather Memorial Hospital.</ExplanationTxt>
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          <CityNm>Port Jefferson</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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        <ImplementationStrategyAdoptInd>true</ImplementationStrategyAdoptInd>
        <ImplementationStrategyAdptYr>16</ImplementationStrategyAdptYr>
        <StrategyPostedWebsiteInd>true</StrategyPostedWebsiteInd>
        <StrategyWebsiteURLTxt>www.matherhospital.org/matherhospital.org/cmsAdmin/uploadsX*</StrategyWebsiteURLTxt>
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      <SupplementalInformationGrp>
        <FormAndLineReferenceDesc>Part V, Line 5 - Account Input from Persons Who Represent the Community</FormAndLineReferenceDesc>
        <ExplanationTxt>Yes. Mather Hospital contacted local civic groups, emergency medical services/ ambulance companies, fire departments, libraries, local school districts, service groups and other community-based organizations and e-mailed them the link to the CHNA online survey.-</ExplanationTxt>
      </SupplementalInformationGrp>
      <SupplementalInformationGrp>
        <FormAndLineReferenceDesc>Part V, Line 6a - List Other Hospital Facilities that Jointly Conducted Needs Assessment</FormAndLineReferenceDesc>
        <ExplanationTxt>Stony Brook University Medical Center, St. Charles Hospital, Brookhaven Hospital Medical Center, Peconic Bay Medical Center, Good Samaritan Hospital Medical Center, St. Catherine of Siena Medical Center, Southampton Hospital and the North-Shore-LIJ Health system.-</ExplanationTxt>
      </SupplementalInformationGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 3c - Charity Care Eligibility Criteria (FPG Is Not Used)</FormAndLineReferenceDesc>
        <ExplanationTxt>The Hospital uses the Federal Poverty Guidelines (FPG) to determine eligibility for providing free/discounted care.Certain assets are also considered to determine eligibility. The following assets are excluded from consideration: patient's primary residence, tax-deferred or comparable retirement savings accounts, college savings accounts, and cars used by the patient or the patient's immediate family. The Hospital also uses Transunion credit scores to determine presumptive eligibility.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 6a - Related Organization Community Benefit Report</FormAndLineReferenceDesc>
        <ExplanationTxt>The Hospital prepares a Community Service Plan. The 2016-2018 Community Service Plan is available on the Hospital website.The web address is www.matherhospital.org/publications.php</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7 - Explanation of Costing Methodology</FormAndLineReferenceDesc>
        <ExplanationTxt>(Row a &amp; b) The cost of charity care was determined by utilizing the ratio of cost to charges (RCC) calculated on Worksheet 2 applied to the charges written off for patients qualifying for charity care under the hospital's financial assistance policy. The Medicaid cost was determined by utilizing the ratio of cost tocharges (RCC) calculated on Worksheet 2 applied to the Medicaidcharges.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7, Column F - Explanation of Bad Debt Expense</FormAndLineReferenceDesc>
        <ExplanationTxt>The Hospital did include bad debt expense on Form 990, Part IX, line 24b.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7g - Costs Associated With Physicans Clinics</FormAndLineReferenceDesc>
        <ExplanationTxt>The cost was obtained from the 2017 Institutional Cost Report Stepdown. Additionally, actual cost identification from salary reports was used.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 2 - Methodology Used To Estimate Bad Debt Expense</FormAndLineReferenceDesc>
        <ExplanationTxt>Bad debt expense is reported by the Hospital for the uncollectible amounts due from patients that are determined to have the ability to pay but did not. The total bad debt expense for 2017 was $5,088,260. This was reported on line 2.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 3 - Methodology of Estimated Amount &amp; Rationale for Including in Community Benefit</FormAndLineReferenceDesc>
        <ExplanationTxt>This represents bad debt write-offs for patients that were also eligible for charity care under the Hospital's policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 4 - Bad Debt Expense</FormAndLineReferenceDesc>
        <ExplanationTxt>The cost of bad debt, as reported in the footnote 12 (page 32) of the certified financial statements, was $1,294,031.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 8 - Explanation Of Shortfall As Community Benefit</FormAndLineReferenceDesc>
        <ExplanationTxt>Medicare expenses reported in this section were obtained from the Medicare cost report. The Medicare cost report uses a stepdown methodology to determine a routine cost/day and a RCC for ancillary services. The routine cost/day is applied to the Medicare days and the RCC is applied to the Medicare ancillary charges.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 9b - Provisions On Collection Practices For Qualified Patients</FormAndLineReferenceDesc>
        <ExplanationTxt>Application assistance is available for patients that are deemed to qualify for financial assistance based on prescreening.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 2 - Needs Assessment</FormAndLineReferenceDesc>
        <ExplanationTxt>The following meetings, reports and documents play a major role in shaping Mather Hospital's community needs assessment: Reports from community, local, state and federal government agencies. Meetings and communication with Suffolk County Department of Health. Current industry journals, periodicals, newsletters and other literature. General health-related news reports Hospital-generated statistical reports Monthly Board of Directors meetings. Board of Directors' Long Range Planning Committee Reports generated by internal committees and task forces. Regular weekly administrative staff planning sessions. Patient questionnaire mailed to all medical/surgical patients. Questionnaires distributed to Emergency Department patients. Patient representative program.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 3 - Patient Education of Eligibility for Assistance</FormAndLineReferenceDesc>
        <ExplanationTxt>Please read the 2016 Report to the Community at our website,http:/www.matherhospital.org under "publications".</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 4 - Community Information</FormAndLineReferenceDesc>
        <ExplanationTxt>Please read 2016 Report to the Community at our website,http:/www.matherhospital.org "under "publications".</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 4 - Community Building Activities</FormAndLineReferenceDesc>
        <ExplanationTxt>Meals on Wheels provides vital nourishment to elderly or disabled community members who, due to immobility and isolation, are unable to prepare their own meals.The Hospital participates in training, planning and exercises in coordination with the State and County entities so it is prepared tp protect the health and safety of the community in the event of a terrorist event, natural disaster or other health emergency.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 5 - Promotion of Community Health</FormAndLineReferenceDesc>
        <ExplanationTxt>Please read the Report to the Community at our website, http:/www.matherhospital.org under "publications.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 7 - States Filing of Community Benefit Report</FormAndLineReferenceDesc>
        <ExplanationTxt>NY</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V - Explanation of Number of Facility Type</FormAndLineReferenceDesc>
        <ExplanationTxt>One licensed hospital</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleH>
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        <PersonNm>WAYNE S SHATTES</PersonNm>
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        <FormAndLineReferenceDesc>Part I, Line 1a: Relevant information in regards to selections on 1a.</FormAndLineReferenceDesc>
        <ExplanationTxt>Travel for companionsAdministrative approval Board member's spouse, relative or significant other, may be reimbursed subject to the following; the nature of the conference, workshop or seminar contains a critical social element in the judgement of the President or the Chairman of the Board and warrants their attendance. The reimbursement is a non-taxable transaction and considered de minimis in the opinion of legal counsel.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Additional Information</FormAndLineReferenceDesc>
        <ExplanationTxt>Part II, Line 2(i), column (iii)Kenneth D. Roberts other reportable compensation, $320,395, includes the proceeds of a Supplemental Executive Retirement Plan ("SERP") in the amount of $307,326 which was paid out of a legacy KEYSOP plan set up to fund the SERP.</ExplanationTxt>
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    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="17005038" softwareVersionNum="2017v2.2">
      <SupplementalInformationDetail>
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        <ExplanationTxt>James Danowski has a business relationship with Richard Lusak.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>Mather Health System Inc. is the sole member of John T. Mather Memorial Hospital. Mather Health System Inc. is organized as a not-for-profit corporation under federal and New York state laws.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a: How Members or Shareholders Elect Governing Body</FormAndLineReferenceDesc>
        <ExplanationTxt>As the sole member of the Corporation, Mather Health System Inc. approves the election and removal of members of the board of directors.-</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b: Describe Decisions of Governing Body Approval by Members or Shareholders</FormAndLineReferenceDesc>
        <ExplanationTxt>Mather Health System Inc. (MHS), pursuant to the New York not-for-profit corporation law, has the authority to (1) elect and remove members of the taxpayer's governing board, (2) approve amendments to the taxpayer's certificate of incorporation and bylaws, and (3) approve significant corporate transactions.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The policy of John T. Mather Memorial Hospital for reviewing and approving the IRS Form 990 is the following; The Hospital's Corporate Compliance &amp; Audit Committee, a six member sub-committee of the Board of Directors, is assigned to review, make recommendations and ultimately approve the IRS Form 990. The Corporate Compliance &amp; Audit Committee will notify the Board of Directors when the IRS Form 990 is approved. The entire Board of Directors will then have the documents made available through a secure online portal before it is filed with the Internal Revenue Service.-</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFLICT OF INTEREST DICLOSURE STATEMENT FOR DIRECTORS and OFFICERS Each year all members of the board, officers and key employees must reaffirm that the conflict of interest form on file with the Hospital is accurate and complete. The sixteen question document is intended to identify business dealings that involve improper conflicts of interest and is prefaced with detailed definitions with regard to; immediate family, vendors, competitors, doing business or a business relationship and disclosable interests.The compliance and audit committee is charged with oversight of adherence to the conflict of interest policy. At the instruction of the compliance and audit committee, legal counsel conducts a review of each disclosure statement and submitsfindings to the audit committee. The audit committee notifies the board of directors of any potential or perceived conflicts of interest. Individuals that have disclosed a potential conflict of interest are asked to excuse themselves from deliberation or actions that may be construed as a conflict of interest.Employees are governed by the same principles and tenets by a written Code of Conduct and Conflict of Interest Policy.-</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b: Compensation Review and Approval Process for Officers and Key Employees</FormAndLineReferenceDesc>
        <ExplanationTxt>The following compensation policy applies to the Hospital's President &amp; CEO and the Hospital's CFO hereafter referred to as a "Covered Individual".The Compensation Committee shall determine and/or approve the amount of Compensation to be paid to any Covered Individual. In making such determination or approval, which shall be performed at least annually, the Compensation Committee shall consider all components of the Covered Individual's Compensation.In determining the appropriate Compensation to be paid to a Covered Individual, the Compensation Committee may, in it's discretion, consider and rely upon the following data, as well as other information or data that it deems relevant; (i) compensation paid for comparable positions by similarly situated non-profit and for-profit entities; (ii) availability of individuals possessing similar expertise or specialized training in the geographic area; (iii) independent compensation surveys compiled by independent firms; and (iv) written offers that the Covered Individual has received from other similar institutions competing for his or her services.In determining the appropriate Compensation to be paid to a Covered Individual, the Compensation Committee will evaluate, or review an evaluation of, the Covered Individual's job performance (if currently employed) and/or a description of the Covered Individual's qualifications (if being recruited by the Organization). Such evaluations and descriptions may include and/or consider a description of the duties and responsibilities of the Covered Individual's position and the results achieved by such individual; other executive's assessments of the importance of the Covered Individual to the Organization and the role of Compensation in retaining and incentivizing the performance of the Covered Individual; whether and to what extent the Covered Individual possesses unique talents and abilities that increase his or her value to the Organization; increases in the nature, scope, or extent of the Covered Individual's duties; and any other subjective factors or other information concerning the Covered Individual's contributions to the Organization that the Compensation Committee deems relevant in setting the Covered Individual's Compensation.-</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 1023 (Application for Recognition of Exemption Under Section 501(c)(3) of the Internal Revenue Code) the Hospital has a verification letter (dated 1/17/1996) from the Internal revenue service confirming that a determination or ruling letter was issued granting exemption on October 1933. A copy of this confirmation letter is available upon request.Form 990 is available at the WEBSITE: http://www.guidestar.org or available upon request.Form 990-T is available upon request.The Hospital's governing documents are available upon request.The Hospital's conflict of interest policies are available upon requestThe Hospital's audited financial statements are attached, available at the WEBSITE: http://www.dacbond.com or available upon request.All requests should be directed to:John T. Mather Memorial Hospital-Finance Department75 North Country RoadPort Jefferson, NY 11777-2119Please list the requested items and give a contact address, email address or phone contact number.A photocopy charge will be applicable as allowed by law.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in FMV of Interest rate swap = $49299</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Increase in interest Related Organization-JTMHFF = $82927</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Decreases</FormAndLineReferenceDesc>
        <ExplanationTxt>Non-periodic pension changes = -$2581226</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Transfer from Affiliate-IRNC = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Decreases</FormAndLineReferenceDesc>
        <ExplanationTxt>Transfer to affiliate (INRC) = -$2822511</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE L, PART IV - SUPPLEMENTAL</FormAndLineReferenceDesc>
        <ExplanationTxt>The Hospital would like to disclose the following information;1) The Hospital maintains professional liability and general insurance policies with Medical Liability Mutual Insurance Company(MLMIC). As a mutual insurance company, MLMIC is required to have a majority of it's board of directors comprised of policyholders. Kenneth Roberts, President &amp; CEO of John T. Mather Memorial Hospital, is a member of the board of directors of MLMIC and received remuneration for his services.2)Kathryn B. Frey, a board member, is a managing partner of North Shore Professional, LP and Harbor Properties Management LLC. North Shore Professional, LP contracts to Harbor Properties Management LLC, which leases office space to the Hospital. Kathryn B. Frey declared a conflict of interest when lease negotiations between the Hospital and Harbor Properties Management LLC were discussed by the Board and excused herself from the board meeting during these discussions. She did not participate in the voting on this decision.3)Dr. Mohammad Bilal, a board member, has a consulting agreement with Medtronic SD, USA a medical device distributor. Dr. Bilal will excuse himself from any discussions regarding the purchase of products from Medtronics or one of their competitors.</ExplanationTxt>
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