Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Happy Chan
Rheumatology Physician in Davis, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1740409218
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Registry record
Entity type Individual (Type 1)
Name Happy Chan
Sex Female
Practice address 451 E Health Sciences Drive Gbsf Suite 6510, Division of Rheumatology, Davis, CA, 95616
Phone (530) 752-2884
Enumeration date Apr 24, 2007
Last updated in NPPES Sep 11, 2011
Taxonomy & licenses
207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 20A8277 (CA) Primary
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
What specialty is Happy Chan?
Happy Chan is registered in NPPES with the primary taxonomy of Rheumatology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-11.