Onn T. Chan M.D., Inc.
NPI 1902094550 · General Practice Physician · Glendora, CA
Onn T. Chan M.D., Inc. is a General Practice Physician organization in Glendora, CA (NPI 1902094550).
Provider details
- NPI number
- 1902094550
- Entity type
- Organization
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Onn Chan, President/Owner(626) 335-0588
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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
Mailing address
Other names (DBA / former)
- Other name
- Onn T. Chan, M.D.
Registry dates
- Enumerated
- 2007-10-09
- Last updated
- 2007-10-25
Frequently asked questions
- What is Onn T. Chan M.D., Inc.'s NPI number?
- Onn T. Chan M.D., Inc.'s National Provider Identifier (NPI) is 1902094550, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Onn T. Chan M.D., Inc.?
- Onn T. Chan M.D., Inc. is classified in the NPPES registry as General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is Onn T. Chan M.D., Inc. located?
- Onn T. Chan M.D., Inc.'s practice location on file with NPPES is 1135 E Route 66 Ste 106, Glendora, CA 91740-3769.
- What is Onn T. Chan M.D., Inc.'s phone number?
- The practice phone number listed in the NPPES registry for Onn T. Chan M.D., Inc. is (626) 335-0588.
- Who is the authorized official for Onn T. Chan M.D., Inc.?
- The authorized official listed on Onn T. Chan M.D., Inc.'s NPPES record is Onn Chan, President/Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Onn T. Chan M.D., Inc.'s NPI active?
- Yes — Onn T. Chan M.D., Inc.'s NPI (1902094550) is active in the NPPES registry as of the last update on 2007-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.