William Shirer, M.D.
NPI 1912438854 · Anesthesiology Physician · San Jose, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Shirer, M.D. is a Anesthesiology Physician provider in San Jose, CA (NPI 1912438854).
Provider details
- NPI number
- 1912438854
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A157296 (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
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (2)
- 751 S Bascom AveSan Jose, CA 95128-2604Phone: (408) 885-5110
- 300 Pasteur DrStanford, CA 94305-2200Phone: (650) 723-4000
Registry dates
- Enumerated
- 2017-03-22
- Last updated
- 2022-08-01
- Certified
- 2022-06-17
Frequently asked questions
- What is William Shirer's NPI number?
- William Shirer's National Provider Identifier (NPI) is 1912438854, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Shirer's specialty?
- William Shirer is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Shirer located?
- William Shirer's practice location on file with NPPES is 250 Hospital Pkwy, San Jose, CA 95119-1103.
- What is William Shirer's phone number?
- The practice phone number listed in the NPPES registry for William Shirer is (408) 972-3000.
- Does William Shirer accept Medicare?
- William Shirer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Shirer's NPI active?
- Yes — William Shirer's NPI (1912438854) is active in the NPPES registry as of the last update on 2022-08-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.