William Frederick, MD, PHD
NPI 1841592805 · Internal Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Frederick, MD, PHD is a Internal Medicine Physician provider in Stanford, CA (NPI 1841592805).
Provider details
- NPI number
- 1841592805
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- A123614 (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
15 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-11-24
- Last updated
- 2025-01-09
- Certified
- 2025-01-09
Frequently asked questions
- What is William Frederick's NPI number?
- William Frederick's National Provider Identifier (NPI) is 1841592805, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Frederick's specialty?
- William Frederick is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Frederick located?
- William Frederick's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is William Frederick's phone number?
- The practice phone number listed in the NPPES registry for William Frederick is (650) 723-4000.
- Does William Frederick accept Medicare?
- William Frederick is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Frederick's NPI active?
- Yes — William Frederick's NPI (1841592805) is active in the NPPES registry as of the last update on 2025-01-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.