Ashley Williams, MD
NPI 1659766640 · Family Medicine Physician · Fullerton, CA
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ashley Williams, MD is a Family Medicine Physician provider in Fullerton, CA (NPI 1659766640).
Provider details
- NPI number
- 1659766640
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A198565 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
11 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 23 | 12 |
| Atorvastatin Calcium | 23 | 11 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 22 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 17 | — |
| Meloxicam | 16 | — |
| Sertraline Hcl | 14 | — |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$265 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-04-06
- Last updated
- 2025-03-18
- Certified
- 2025-03-18
Frequently asked questions
- What is Ashley Williams's NPI number?
- Ashley Williams's National Provider Identifier (NPI) is 1659766640, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ashley Williams's specialty?
- Ashley Williams is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ashley Williams located?
- Ashley Williams's practice location on file with NPPES is 800 N State College Blvd, Fullerton, CA 92831-3599.
- What is Ashley Williams's phone number?
- The practice phone number listed in the NPPES registry for Ashley Williams is (657) 278-2800.
- Does Ashley Williams accept Medicare?
- Ashley Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ashley Williams's NPI active?
- Yes — Ashley Williams's NPI (1659766640) is active in the NPPES registry as of the last update on 2025-03-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.