Tom Williams, MD
NPI 1932393220 · Family Medicine Physician · San Ysidro, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tom Williams, MD is a Family Medicine Physician provider in San Ysidro, CA (NPI 1932393220).
Provider details
- NPI number
- 1932393220
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A100446 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 322 | 137 |
| Lisinopril | 200 | 78 |
| Amlodipine Besylate | 178 | 71 |
| Rosuvastatin Calcium | 154 | 60 |
| Losartan Potassium | 133 | 53 |
| Metformin Hclbrand: Metformin Hcl Er | 124 | 42 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-30
- Last updated
- 2021-12-01
Frequently asked questions
- What is Tom Williams's NPI number?
- Tom Williams's National Provider Identifier (NPI) is 1932393220, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tom Williams's specialty?
- Tom Williams is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tom Williams located?
- Tom Williams's practice location on file with NPPES is 4004 Beyer Blvd, San Ysidro, CA 92173-2007.
- What is Tom Williams's phone number?
- The practice phone number listed in the NPPES registry for Tom Williams is (619) 428-1330.
- Does Tom Williams accept Medicare?
- Tom Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tom Williams's NPI active?
- Yes — Tom Williams's NPI (1932393220) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.