William Phillips, M.D.
NPI 1538188198 · Obstetrics & Gynecology Physician · Pleasanton, CA
William Phillips, M.D. is a Obstetrics & Gynecology Physician provider in Pleasanton, CA (NPI 1538188198).
Provider details
- NPI number
- 1538188198
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A52308 (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
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
- 2006-07-18
- Last updated
- 2007-07-09
Frequently asked questions
- What is William Phillips's NPI number?
- William Phillips's National Provider Identifier (NPI) is 1538188198, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Phillips's specialty?
- William Phillips is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is William Phillips located?
- William Phillips's practice location on file with NPPES is 5575 W Las Positas Blvd, Pleasanton, CA 94588-5801.
- What is William Phillips's phone number?
- The practice phone number listed in the NPPES registry for William Phillips is (925) 734-6655.
- Is William Phillips's NPI active?
- Yes — William Phillips's NPI (1538188198) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.