Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
James Castles, M.D.
Rheumatology Physician in Davis, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1477623403
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Registry record
Entity type Individual (Type 1)
Name James Castles
Credential M.D.
Sex Male
Practice address 451 E. Health Sciences Drive, Suite 6510, Davis, CA, 95616
Phone (530) 752-2884
Fax (530) 754-6047
Enumeration date Nov 8, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License GFE25647 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Is NPI 1477623403 active?
Yes, as of the latest NPPES snapshot, NPI 1477623403 is active (record last updated 2007-07-08).
How do I verify James Castles's NPI record?
Cross-check NPI 1477623403 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.