Alanna Williams
NPI 1407505613 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alanna Williams is a Internal Medicine Physician provider in San Francisco, CA (NPI 1407505613).
Provider details
- NPI number
- 1407505613
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Mailing address
Additional practice locations (1)
- 505 Parnassus AveSan Francisco, CA 94143-2204Phone: (415) 476-1000
Registry dates
- Enumerated
- 2022-03-23
- Last updated
- 2025-04-24
- Certified
- 2025-04-24
Frequently asked questions
- What is Alanna Williams's NPI number?
- Alanna Williams's National Provider Identifier (NPI) is 1407505613, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alanna Williams's specialty?
- Alanna Williams is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alanna Williams located?
- Alanna Williams's practice location on file with NPPES is 521 Parnassus Ave, San Francisco, CA 94143-2206.
- What is Alanna Williams's phone number?
- The practice phone number listed in the NPPES registry for Alanna Williams is (415) 476-1000.
- Does Alanna Williams accept Medicare?
- Alanna Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alanna Williams's NPI active?
- Yes — Alanna Williams's NPI (1407505613) is active in the NPPES registry as of the last update on 2025-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.