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James Castles, M.D.
NPI 1477623403 · Rheumatology Physician · Davis, CA
James Castles, M.D. is a Rheumatology Physician provider in Davis, CA (NPI 1477623403).
Provider details
- NPI number
- 1477623403
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- GFE25647 (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
451 E. Health Sciences Drive
Suite 6510
Davis, CA 95616
Phone: (530) 752-2884
Fax: (530) 754-6047
Approximate (ZIP-level) locationGet directions
Mailing address
451 E. Health Sciences Drive
Davis, CA 95616
Registry dates
- Enumerated
- 2006-11-08
- Last updated
- 2007-07-08
Frequently asked questions
- What is James Castles's NPI number?
- James Castles's National Provider Identifier (NPI) is 1477623403, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Castles's specialty?
- James Castles is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is James Castles located?
- James Castles's practice location on file with NPPES is 451 E. Health Sciences Drive, Davis, CA 95616.
- What is James Castles's phone number?
- The practice phone number listed in the NPPES registry for James Castles is (530) 752-2884.
- Is James Castles's NPI active?
- Yes — James Castles's NPI (1477623403) 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.