Justin Williams, MD
NPI 1063049823 · Pediatrics Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Williams, MD is a Pediatrics Physician provider in San Francisco, CA (NPI 1063049823).
Provider details
- NPI number
- 1063049823
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A186342 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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
Mailing address
Registry dates
- Enumerated
- 2020-03-23
- Last updated
- 2026-03-13
- Certified
- 2026-03-13
Frequently asked questions
- What is Justin Williams's NPI number?
- Justin Williams's National Provider Identifier (NPI) is 1063049823, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Williams's specialty?
- Justin Williams is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Williams located?
- Justin Williams's practice location on file with NPPES is 550 16th St Fl Hall4, San Francisco, CA 94143-2549.
- What is Justin Williams's phone number?
- The practice phone number listed in the NPPES registry for Justin Williams is (415) 476-5001.
- Does Justin Williams accept Medicare?
- Justin Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Williams's NPI active?
- Yes — Justin Williams's NPI (1063049823) is active in the NPPES registry as of the last update on 2026-03-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.