William Leggett, MD
NPI 1215011283 · Internal Medicine Physician · San Rafael, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Leggett, MD is a Internal Medicine Physician provider in San Rafael, CA (NPI 1215011283).
Provider details
- NPI number
- 1215011283
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A92010 (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
19 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 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 103 | 70 |
| Tamsulosin Hcl | 46 | 28 |
| Losartan Potassium | 42 | 33 |
| Mupirocin | 38 | 37 |
| Lisinopril | 37 | 31 |
| Pantoprazole Sodium | 36 | 26 |
| Levothyroxine Sodium | 32 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2021-12-13
Frequently asked questions
- What is William Leggett's NPI number?
- William Leggett's National Provider Identifier (NPI) is 1215011283, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Leggett's specialty?
- William Leggett is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Leggett located?
- William Leggett's practice location on file with NPPES is 99 Montecillo Rd, San Rafael, CA 94903-3308.
- What is William Leggett's phone number?
- The practice phone number listed in the NPPES registry for William Leggett is (415) 444-2000.
- Does William Leggett accept Medicare?
- William Leggett is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Leggett's NPI active?
- Yes — William Leggett's NPI (1215011283) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.