William Guerin, MD
NPI 1245760578 · Student in an Organized Health Care Education/Training Program · Martinez, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Guerin, MD is a Student in an Organized Health Care Education/Training Program provider in Martinez, CA (NPI 1245760578).
Provider details
- NPI number
- 1245760578
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
83% 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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Amlodipine Besylate | 19 |
| Atorvastatin Calcium | 18 |
| Omeprazole | 17 |
| Pramipexole Di-Hclbrand: Pramipexole Dihydrochloride | 11 |
| Lisinopril | 11 |
| Losartan Potassium | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-06-19
- Last updated
- 2022-07-21
Frequently asked questions
- What is William Guerin's NPI number?
- William Guerin's National Provider Identifier (NPI) is 1245760578, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Guerin's specialty?
- William Guerin is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is William Guerin located?
- William Guerin's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is William Guerin's phone number?
- The practice phone number listed in the NPPES registry for William Guerin is (925) 370-5200.
- Does William Guerin accept Medicare?
- William Guerin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Guerin's NPI active?
- Yes — William Guerin's NPI (1245760578) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.