Quick answers
- Which hospitals does Robert B. Williams work at?
- Medicare's official clinician data lists Robert B. Williams at 3 hospitals: AHMC Seton Medical Center, California Pacific Medical Center - Mission Bernal… and Zuckerberg San Francisco General Hosp & Trauma Ctr. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Robert B. Williams see patients?
- Medicare's clinician data lists 3 practice locations, including San Francisco, CA. Call before your visit to confirm the address.
- What is Robert B. Williams's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Robert B. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Robert B. 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.
- What is the phone number for Robert B. Williams?
- (415) 852-4080, as listed in official Medicare / NPI Registry data.
- What is Robert B. Williams's NPI number?
- 1225193667. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Robert B. Williams works
Medicare's Facility Affiliation Data lists Robert B. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- AHMC Seton Medical CenterDaly City, CA · Acute Care Hospital · CCN 050289
- California Pacific Medical Center - Mission Bernal…San Francisco, CA · Acute Care Hospital · CCN 050055
- Zuckerberg San Francisco General Hosp & Trauma CtrSan Francisco, CA · Acute Care Hospital · CCN 050228
Practice locations
Addresses where Robert B. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1580 Valencia St, Suite 506San Francisco, CA 94110 (415) 852‑4080
- 240 Shotwell StSan Francisco, CA 94110
- 4434 Mission StSan Francisco, CA 94112 (415) 552‑1013
Group practices
Medicare enrollment lists Robert B. Williams as a member of this group (CMS data updated 2026-10-02).
- Mission Area Health Associates19 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of South Alabama College Of Medicine |
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225193667 |
| 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