William M Sullivan, MD - Medicare Endocrinology in Boston, MA

William M Sullivan, MD is a medicare enrolled "Internal Medicine - Endocrinology, Diabetes & Metabolism" physician in Boston, Massachusetts. He went to Georgetown University School Of Medicine and graduated in 1980 and has 44 years of diverse experience with area of expertise as Endocrinology. He is a member of the group practice Joslin Clinic Inc and his current practice location is Joslin Diabetes Center, One Joslin Place, Boston, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 732-2645.

William M Sullivan is licensed to practice in Massachusetts (license number 72821) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1922107234.

Contact Information

William M Sullivan, MD
Joslin Diabetes Center, One Joslin Place,
Boston, MA 02215
(617) 732-2645
Not Available

Map and Direction




Physician's Profile

Full NameWilliam M Sullivan
GenderMale
SpecialityEndocrinology
Experience44 Years
LocationJoslin Diabetes Center, Boston, Massachusetts
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • William M Sullivan attended and graduated from Georgetown University School Of Medicine in 1980
  NPI Data:
  • NPI Number: 1922107234
  • Provider Enumeration Date: 09/22/2006
  • Last Update Date: 11/28/2011
  Medicare PECOS Information:
  • PECOS PAC ID: 4981651569
  • Enrollment ID: I20050406000035

Medical Identifiers

Medical identifiers for William M Sullivan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1922107234NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RE0101XInternal Medicine - Endocrinology, Diabetes & Metabolism 72821 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Beth Israel Deaconess Hospital - NeedhamNeedham, MAHospital
Beth Israel Deaconess Medical CenterBoston, MAHospital
Newton-wellesley HospitalNewton, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Joslin Clinic Inc509279488362

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. William M Sullivan allows following entities to bill medicare on his behalf.
Entity NameHarvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1194765438
PECOS PAC ID: 4486567104
Enrollment ID: O20031204000918
Entity NameJoslin Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1528003621
PECOS PAC ID: 5092794883
Enrollment ID: O20040715000769

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. William M Sullivan is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
William M Sullivan, MD
Joslin Clinic, Inc, One Joslin Place,
Boston, MA 02215-5304

Ph: (617) 732-2645
William M Sullivan, MD
Joslin Diabetes Center, One Joslin Place,
Boston, MA 02215

Ph: (617) 732-2645

Reviews and Comments


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Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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