William A Freed-pastor, MD, PHD - Medicare Medical Oncology in Boston, MA

William A Freed-pastor, MD, PHD is a medicare enrolled "Internal Medicine" physician in Boston, Massachusetts. He went to Columbia University College Of Physicians And Surgeons and graduated in 2013 and has 11 years of diverse experience with area of expertise as Medical Oncology. He is a member of the group practice Dana-farber Cancer Institute, Inc. and his current practice location is Massachusetts General Hospital, 55 Fruit St., Boston, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 726-2865.

William A Freed-pastor is licensed to practice in Massachusetts (license number L-255592) 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 1982041117.

Contact Information

William A Freed-pastor, MD, PHD
Massachusetts General Hospital, 55 Fruit St.,
Boston, MA 02114
(617) 726-2865
Not Available

Map and Direction




Physician's Profile

Full NameWilliam A Freed-pastor
GenderMale
SpecialityMedical Oncology
Experience11 Years
LocationMassachusetts General Hospital, 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 A Freed-pastor attended and graduated from Columbia University College Of Physicians And Surgeons in 2013
  NPI Data:
  • NPI Number: 1982041117
  • Provider Enumeration Date: 05/29/2013
  • Last Update Date: 05/29/2013
  Medicare PECOS Information:
  • PECOS PAC ID: 8224265731
  • Enrollment ID: I20201230000298

Medical Identifiers

Medical identifiers for William A Freed-pastor such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1982041117NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine L-255592 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Brigham And Women's HospitalBoston, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Dana-farber Cancer Institute, Inc.9133038904521

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 A Freed-pastor allows following entities to bill medicare on his behalf.
Entity NameDana-farber Cancer Institute, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346433257
PECOS PAC ID: 9133038904
Enrollment ID: O20040223000142
Entity NameDana-farber Cancer Institute, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1851333686
PECOS PAC ID: 9133038904
Enrollment ID: O20040223000228

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 A Freed-pastor 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 A Freed-pastor, MD, PHD
Massachusetts General Hospital, 55 Fruit St.,
Boston, MA 02114

Ph: (617) 726-2865
William A Freed-pastor, MD, PHD
Massachusetts General Hospital, 55 Fruit St.,
Boston, MA 02114

Ph: (617) 726-2865

Reviews and Comments


Internal Medicine Doctors in Boston, MA

Kaitlyn My-tu Lam, MBBS
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-724-7738    
Kui Toh Gerard Leong, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 55 Fruit Street, Massachusetts General Hospital, Boston, MA 02114
Phone: 617-726-8862    
Ruma Rajbhandari,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 75 Francis St, Boston, MA 02115
Phone: 617-525-6841    
Alaka Ray, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2066    
Meghan E Sise, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2862    
Aaron Dickstein, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 800 Washington St, Box 233, Boston, MA 02111
Phone: 617-636-5883    Fax: 617-636-9292
Dr. Felicia Elizabeth Patch, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 801 Massachusetts Ave, Crosstown 2, Boston, MA 02118
Phone: 617-414-4376    Fax: 617-414-4676

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.