IndividualActive
Warren Fan, M.D.
NPI 1245260538 · Contractor · Upland, CA
Warren Fan, M.D. is a Contractor provider in Upland, CA (NPI 1245260538).
Provider details
- NPI number
- 1245260538
- Entity type
- Individual
- Primary specialty
- ContractorOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A32805 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
Detailed profile(91/100 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
637 North 13th Avenue
Upland, CA 91786
Phone: (909) 946-4106
Fax: (909) 949-4366
Street-level locationGet directions
Mailing address
637 N 13th Ave
Upland, CA 91786-4906
Registry dates
- Enumerated
- 2006-07-03
- Last updated
- 2007-07-08
Frequently asked questions
- What is Warren Fan's NPI number?
- Warren Fan's National Provider Identifier (NPI) is 1245260538, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Warren Fan's specialty?
- Warren Fan is listed in the NPPES registry with a primary specialty of Contractor (Other Service Providers).
- Where is Warren Fan located?
- Warren Fan's practice location on file with NPPES is 637 North 13th Avenue, Upland, CA 91786.
- What is Warren Fan's phone number?
- The practice phone number listed in the NPPES registry for Warren Fan is (909) 946-4106.
- Is Warren Fan's NPI active?
- Yes — Warren Fan's NPI (1245260538) 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.