Ashley G. Williams, MD
Family Medicine Physician · Fullerton, CA
Ashley G. Williams, MD is a family medicine physician with a practice address in Fullerton, California, and NPI 1659766640, issued on Apr 6, 2015. Check the license (California A198565, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ashley G. Williams
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A198565 CA
Self-reported in NPPES; status is on the state search - Practice location
- 800 N State College Blvd, Fullerton, CA 92831
- Phone
- (657) 278-2800
- Enumerated
- Apr 6, 2015
- Record last updated
- Mar 18, 2025
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 800 N State College Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Isabel AlvaradoStudent in an Organized Health Care Education/Training Program1356296149
- Samuel ArnoldAthletic Trainer1558860221
- Lizzeth BroadwayPsychiatric/Mental Health Nurse Practitioner1972842185
- Alex CaballeroStudent in an Organized Health Care Education/Training Program1477408060
- Patricia Catanzaro, NPFamily Nurse Practitioner1104977156
- Kimberly CebulskiStudent in an Organized Health Care Education/Training Program1740850213
Verify Ashley G. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A198565Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average family medicine physician in 2024
488 Medicare Part D claims for 100 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Amlodipine Besylate23 claims
- Atorvastatin Calcium23 claims
- Trelegy Ellipta22 claims
- Albuterol Sulfate Hfa17 claims
- Meloxicam16 claims
- Sertraline Hcl14 claims
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.
Industry payments in 2024: $265.36
4 payments; by number, the most common kind was food and beverage; the largest payer was ShockWave Medical, Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Ashley G. Williams among 17,133 family medicine physician records in California
Ashley G. Williams, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
35 family medicine physician records list a practice address in Fullerton
They are 35 of the 5,437 NPPES records with a practice address in Fullerton, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Fullerton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- James Huang, D.O.Fullerton, CA 928311518992635
- Howard Pyo, D.OFullerton, CA 928311831540632
- Wonbae Choe, M.D.Fullerton, CA 928321104955194
- Son Do, M.D.Fullerton, CA 928321184284168
- Anthony-Tu DoFullerton, CA 928321154070910
- Henry Kaw, M.D.Fullerton, CA 928321215022967
- Grainne McEvoy, M.D.Fullerton, CA 928321841369667
- Milie Tolentino, MDFullerton, CA 928321063531531
Common questions
What is Ashley G. Williams, MD's NPI number?
Ashley G. Williams, MD's National Provider Identifier (NPI) is 1659766640, issued on Apr 6, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Ashley G. Williams, MD located?
The NPPES record lists a practice address at 800 N State College Blvd, Fullerton, CA, 92831. Phone: (657) 278-2800. Providers update this record themselves, so call before visiting.
How can I verify Ashley G. Williams, MD's license?
NPPES lists California license number A198565, 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 Ashley G. Williams, MD prescribe under Medicare Part D?
In 2024, Ashley G. Williams, MD had 488 Medicare Part D claims for 100 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.