Quick answers
- Which hospitals does Winfred W. Williams work at?
- Medicare's official clinician data lists Winfred W. Williams at 4 hospitals: Brigham and Women's Hospital, Martha's Vineyard Hospital Inc, Massachusetts General Hospital and North Shore Medical Center -. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Winfred W. Williams see patients?
- Medicare's clinician data lists 1 practice location in Boston, MA. Call before your visit to confirm the address.
- What is Winfred W. Williams's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does Winfred W. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Winfred W. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Winfred W. Williams offer telehealth?
- Medicare's clinician data says Winfred W. Williams offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Winfred W. Williams?
- (617) 726-2000, as listed in official Medicare / NPI Registry data.
- What is Winfred W. Williams's NPI number?
- 1891709242. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Winfred W. Williams works
Medicare's Facility Affiliation Data lists Winfred W. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Brigham and Women's HospitalBoston, MA · Acute Care Hospital · CCN 220110
- Martha's Vineyard Hospital IncOak Bluffs, MA · Critical Access Hospital · CCN 221300
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
- North Shore Medical Center -Salem, MA · Acute Care Hospital · CCN 220035
Practice locations
Addresses where Winfred W. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 55 Fruit StBoston, MA 02114 (617) 726‑2000
Group practices
Medicare enrollment lists Winfred W. Williams as a member of these groups (CMS data updated 2026-10-02).
- Massachusetts General Physicians Organization Inc3,558 clinicians in the group
- The General Hospital Corporation1,267 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 1980 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1891709242 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians