Dr Robert Patrick Williamson, MD - Medicare Internal Medicine in Wilmington, MA

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Dr Robert Patrick Williamson, MD is a medicare enrolled "Internal Medicine" physician in Wilmington, Massachusetts. His current practice location is 500 Salem Street, Wilmington, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (978) 988-6000.

Dr Robert Patrick Williamson is licensed to practice in Massachusetts (license number 51661) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1821068305.

Contact Information

Dr Robert Patrick Williamson, MD
500 Salem Street,
Wilmington, MA 01887
(978) 988-6000
(781) 396-1620

Map and Direction




Physician's Profile

Full NameDr Robert Patrick Williamson
GenderMale
SpecialityInternal Medicine
Location500 Salem Street, Wilmington, Massachusetts
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1821068305
  • Provider Enumeration Date: 01/25/2006
  • Last Update Date: 03/23/2017
  Medicare PECOS Information:
  • PECOS PAC ID: 3870588361
  • Enrollment ID: I20040415000345

Medical Identifiers

Medical identifiers for Dr Robert Patrick Williamson such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1821068305NPI-NPPES
6192696MedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 51661 (Massachusetts)Primary

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. Dr Robert Patrick Williamson allows following entities to bill medicare on his behalf.
Entity NameWinchester Physician Associates Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1184606865
PECOS PAC ID: 4486540994
Enrollment ID: O20060215000452

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. Dr Robert Patrick Williamson 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
Dr Robert Patrick Williamson, MD
500 Salem Street,
Wilmington, MA 01887

Ph: (781) 729-1368		Dr Robert Patrick Williamson, MD
500 Salem Street,
Wilmington, MA 01887

Ph: (978) 988-6000

Reviews and Comments


Internal Medicine Doctors in Wilmington, MA

Jeena Vaid, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 64c Concord St, Wilmington, MA 01887
Phone: 978-658-4432    
Hoai Nu T Vo, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 64c Concord St, Wilmington, MA 01887
Phone: 978-988-9700    Fax: 978-988-9701
Dr. Neeti Jha, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 500 Salem Street, Wilmington, MA 01887
Phone: 978-988-9255    Fax: 978-964-9675
Josephine A Albano, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 25 Lowell Street, Wilmington, MA 01887
Phone: 978-657-7911    Fax: 978-657-7914
John J Sullivan, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 172 Middlesex Ave, Wilmington, MA 01887
Phone: 978-658-4432    Fax: 978-658-5751
Melissa Mazzini Zorn, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 500 Salem St, Woburn Medical Associates Pc, Wilmington, MA 01887
Phone: 978-988-9255    Fax: 978-694-9675
Mrs. Kristen Marie Ghergurovich, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 500 Salem Street, Woburn Medical Associates Pc, Wilmington, MA 01887
Phone: 978-988-9255    Fax: 978-694-9675

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).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.