IndividualActive
Happy Chan
NPI 1740409218 · Rheumatology Physician · Davis, CA
Happy Chan is a Rheumatology Physician provider in Davis, CA (NPI 1740409218).
Provider details
- NPI number
- 1740409218
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 20A8277 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(89/100 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 Gbsf Suite 6510
Division of Rheumatology
Davis, CA 95616
Phone: (530) 752-2884
Approximate (ZIP-level) locationGet directions
Mailing address
451 E Health Sciences Drive Gbsf Suite 6510
Davis, CA 95616
Registry dates
- Enumerated
- 2007-04-24
- Last updated
- 2011-09-11
Frequently asked questions
- What is Happy Chan's NPI number?
- Happy Chan's National Provider Identifier (NPI) is 1740409218, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Happy Chan's specialty?
- Happy Chan is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Happy Chan located?
- Happy Chan's practice location on file with NPPES is 451 E Health Sciences Drive Gbsf Suite 6510, Davis, CA 95616.
- What is Happy Chan's phone number?
- The practice phone number listed in the NPPES registry for Happy Chan is (530) 752-2884.
- Is Happy Chan's NPI active?
- Yes — Happy Chan's NPI (1740409218) is active in the NPPES registry as of the last update on 2011-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.