William Joseph, M.D.
NPI 1356423255 · Infectious Disease Physician · San Ramon, CA
William Joseph, M.D. is a Infectious Disease Physician provider in San Ramon, CA (NPI 1356423255).
Provider details
- NPI number
- 1356423255
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G27536 (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 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Clonazepam | 14 |
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
- 2006-10-19
- Last updated
- 2022-04-19
- Certified
- 2022-04-19
Frequently asked questions
- What is William Joseph's NPI number?
- William Joseph's National Provider Identifier (NPI) is 1356423255, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Joseph's specialty?
- William Joseph is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Joseph located?
- William Joseph's practice location on file with NPPES is 5601 Norris Canyon Rd, San Ramon, CA 94583-5407.
- What is William Joseph's phone number?
- The practice phone number listed in the NPPES registry for William Joseph is (925) 277-2050.
- Is William Joseph's NPI active?
- Yes — William Joseph's NPI (1356423255) is active in the NPPES registry as of the last update on 2022-04-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.