William Fay, DDS
NPI 1841351376 · Orthodontics and Dentofacial Orthopedics Dentistry · San Francisco, CA
Enrolled with Medicare as Order and Referring Only - Dentist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Fay, DDS is a Orthodontics and Dentofacial Orthopedics Dentistry provider in San Francisco, CA (NPI 1841351376).
Provider details
- NPI number
- 1841351376
- Entity type
- Individual
- Primary specialty
- Orthodontics and Dentofacial Orthopedics DentistryDental Providers
- Credential
- DDS
- Sex
- Male
- Sole proprietor
- No
- License
- DDS22456 (CA)
Specialties & taxonomies
Dental Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
- 2006-12-12
- Last updated
- 2021-08-01
- Certified
- 2021-08-01
Frequently asked questions
- What is William Fay's NPI number?
- William Fay's National Provider Identifier (NPI) is 1841351376, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Fay's specialty?
- William Fay is listed in the NPPES registry with a primary specialty of Orthodontics and Dentofacial Orthopedics Dentistry (Dental Providers).
- Where is William Fay located?
- William Fay's practice location on file with NPPES is 3501 Fillmore St Apt 301, San Francisco, CA 94123-2158.
- What is William Fay's phone number?
- The practice phone number listed in the NPPES registry for William Fay is (415) 994-1188.
- Does William Fay accept Medicare?
- William Fay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Fay's NPI active?
- Yes — William Fay's NPI (1841351376) is active in the NPPES registry as of the last update on 2021-08-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.