Quick answers
- Which hospitals does Gray R. Williams work at?
- Medicare's official clinician data lists Gray R. Williams at 1 hospital: Kaiser Foundation Hospital and Rehab Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gray R. Williams see patients?
- Medicare's clinician data lists 1 practice location in Vallejo, CA. Call before your visit to confirm the address.
- What is Gray R. Williams's specialty?
- Medicare lists Podiatry as the primary specialty.
- Does Gray R. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Gray R. 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 Gray R. Williams?
- (707) 651-1000, as listed in official Medicare / NPI Registry data.
- What is Gray R. Williams's NPI number?
- 1750455028. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gray R. Williams works
Medicare's Facility Affiliation Data lists Gray R. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital and Rehab CenterVallejo, CA · Acute Care Hospital · CCN 050073
Practice locations
Addresses where Gray R. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 975 Sereno DrVallejo, CA 94589 (707) 651‑1000
Group practices
Medicare enrollment lists Gray R. Williams as a member of this group (CMS data updated 2026-10-02).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Podiatryprimary
Other podiatrists in Vallejo
Clinicians with the same Medicare primary specialty in Vallejo, CA — not a recommendation.
Clinician information
| Credential | DPM |
|---|---|
| Medical school | Barry University School Of Podiatric Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1750455028 |
| 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