Stephen A. Williams, M.D.
Obstetrics & Gynecology Physician · Pleasanton, CA
Stephen A. Williams, M.D. is an obstetrics & gynecology physician with a practice address in Pleasanton, California, and NPI 1881613461, issued on Jul 18, 2006. Check the license (California A31965, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen A. Williams
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A31965 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.
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Verify Stephen A. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A31965Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $144.09
1 payment: food and beverage; the largest payer was Abbvie Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Stephen A. Williams among 5,088 obstetrics & gynecology physician records in California
Stephen A. Williams, 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
- William Phillips, M.D.Pleasanton, CA 945881538188198
Common questions
What is Stephen A. Williams, M.D.'s NPI number?
Stephen A. Williams, M.D.'s National Provider Identifier (NPI) is 1881613461, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen A. Williams, 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 Stephen A. Williams, M.D.'s license?
NPPES lists California license number A31965, 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.
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.