William H. Phillips, M.D.
Obstetrics & Gynecology Physician · Pleasanton, CA
William H. Phillips, M.D. is an obstetrics & gynecology physician with a practice address in Pleasanton, California, and NPI 1538188198, issued on Jul 18, 2006. Check the license (California A52308, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William H. Phillips
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A52308 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5575 W Las Positas Blvd, Pleasanton, CA 94588
- Phone
- (925) 734-6655
- Enumerated
- Jul 18, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 734-9294
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 5575 W Las Positas Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marion Anthony, M.D.Specialist1679577563
- Nikhil Apte, MDInternal Medicine Physician1972552206
- David Chee, MDInternal Medicine Physician1306846373
- Juliana Cinque, MDDermatology Physician1083643084
- Chau Dang, MDSurgery Physician1649213398
- Michael Gagnon, MDOphthalmology Physician1164525598
Verify William H. Phillips in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A52308Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
15 Medicare Part D claims, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
William H. Phillips among 5,088 obstetrics & gynecology physician records in California
William H. Phillips, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2007 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
31 obstetrics & gynecology physician records list a practice address in Pleasanton
They are 31 of the 2,213 NPPES records with a practice address in Pleasanton, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Pleasanton → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Deborah Ansley, MDPleasanton, CA 945881336227412
- Pushpa Dalal, MDPleasanton, CA 945881013089408
- Todd Dillard, MDPleasanton, CA 945881346328424
- Hanh-Nguyen Do, MDPleasanton, CA 945881003907338
- Peggy Hsu, MDPleasanton, CA 945881285712372
- Janis Kahn, MDPleasanton, CA 945881558449629
- Tun Lee, M.D.Pleasanton, CA 945881518983519
- Gul Qidwai, MDPleasanton, CA 945881801974985
Common questions
What is William H. Phillips, M.D.'s NPI number?
William H. Phillips, M.D.'s National Provider Identifier (NPI) is 1538188198, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William H. Phillips, M.D. located?
The NPPES record lists a practice address at 5575 W Las Positas Blvd, Pleasanton, CA, 94588. Phone: (925) 734-6655. Providers update this record themselves, so call before visiting.
How can I verify William H. Phillips, M.D.'s license?
NPPES lists California license number A52308, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William H. Phillips, M.D. prescribe under Medicare Part D?
In 2024, William H. Phillips, M.D. had 15 Medicare Part D claims; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.