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William Williams, MD
NPI 1407034473 · Adult Medicine Physician · San Quentin, CA
William Williams, MD is a Adult Medicine Physician provider in San Quentin, CA (NPI 1407034473).
Provider details
- NPI number
- 1407034473
- Entity type
- Individual
- Primary specialty
- Adult Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A70449 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(88/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
1 Main St
San Quentin, CA 94964-1000
Phone: (415) 454-1460
Fax: (415) 455-5091
Approximate (ZIP-level) locationGet directions
Mailing address
1 Main St
San Quentin, CA 94964-1000
Registry dates
- Enumerated
- 2008-02-01
- Last updated
- 2008-02-01
Frequently asked questions
- What is William Williams's NPI number?
- William Williams's National Provider Identifier (NPI) is 1407034473, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Williams's specialty?
- William Williams is listed in the NPPES registry with a primary specialty of Adult Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Williams located?
- William Williams's practice location on file with NPPES is 1 Main St, San Quentin, CA 94964-1000.
- What is William Williams's phone number?
- The practice phone number listed in the NPPES registry for William Williams is (415) 454-1460.
- Is William Williams's NPI active?
- Yes — William Williams's NPI (1407034473) is active in the NPPES registry as of the last update on 2008-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.