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Frederick Challoner, MD
NPI 1043394117 · Hospitalist Physician · Santa Rosa, CA
Frederick Challoner, MD is a Hospitalist Physician provider in Santa Rosa, CA (NPI 1043394117).
Provider details
- NPI number
- 1043394117
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C39337 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
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.
Practice location
401 Bicentennial Way
Santa Rosa, CA 95403-2149
Phone: (707) 571-4000
Approximate (ZIP-level) locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2007-07-08
Frequently asked questions
- What is Frederick Challoner's NPI number?
- Frederick Challoner's National Provider Identifier (NPI) is 1043394117, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frederick Challoner's specialty?
- Frederick Challoner is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Frederick Challoner located?
- Frederick Challoner's practice location on file with NPPES is 401 Bicentennial Way, Santa Rosa, CA 95403-2149.
- What is Frederick Challoner's phone number?
- The practice phone number listed in the NPPES registry for Frederick Challoner is (707) 571-4000.
- Is Frederick Challoner's NPI active?
- Yes — Frederick Challoner's NPI (1043394117) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.