Erin Patricia Williams, MD
Pediatrics Physician · San Francisco, CA
Erin Patricia Williams, MD is a pediatrics physician with a practice address in San Francisco, California, and NPI 1134705908, issued on Mar 22, 2021. Check the license (California A199108, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Erin Patricia Williams
- Credential
- MD
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- A199108 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1975 4TH St, San Francisco, CA 94143
- Phone
- (415) 476-5153
- Enumerated
- Mar 22, 2021
- Record last updated
- Nov 24, 2025
- Fax
- (415) 476-5354
- Medicare enrollment
- Enrolled (PECOS I20251206000368); may accept Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 2021
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 1975 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Erin Patricia Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A199108Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Erin Patricia Williams among 9,272 pediatrics physician records in California
Erin Patricia Williams, MD is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2021, is newer than 94% of them.
- NPI issued2021 · 94% of these records are older, 4% newer
- In a Medicare fileNo · 31% of these records are
- In the CMS Doctors and Clinicians fileYes · 8% of these records are
- Graduated2021 · median 2012 among the 754 with a school on file
- Record last updated2025 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
514 pediatrics physician records list a practice address in San Francisco
They are 514 of the 38,143 NPPES records with a practice address in San Francisco, and 9,272 pediatrics physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 9,272 in California → Every provider in San Francisco → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Louis Chesler, M.D.San Francisco, CA 941431124060504
- Gwynne Church, M.D.San Francisco, CA 941431801838925
- John Elliott, M.D.San Francisco, CA 941431821042292
- Ilona Frieden, MDSan Francisco, CA 941431396703435
- Samuel Hawgood, MDSan Francisco, CA 941431144285776
- Melvin Heyman, M.D.San Francisco, CA 941431740222314
- Nancy Lewis, M.D.San Francisco, CA 941431245272368
- John McQuitty, M.D.San Francisco, CA 941431386682417
Common questions
What is Erin Patricia Williams, MD's NPI number?
Erin Patricia Williams, MD's National Provider Identifier (NPI) is 1134705908, issued on Mar 22, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Erin Patricia Williams, MD located?
The NPPES record lists a practice address at 1975 4TH St, San Francisco, CA, 94143. Phone: (415) 476-5153. Providers update this record themselves, so call before visiting.
How can I verify Erin Patricia Williams, MD's license?
NPPES lists California license number A199108, 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. 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.