Stephen Chao, MD
NPI 1083832927 · Obstetrics & Gynecology Physician · Fontana, CA
Stephen Chao, MD is a Obstetrics & Gynecology Physician provider in Fontana, CA (NPI 1083832927).
Provider details
- NPI number
- 1083832927
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G31842 (CA)
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
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
Mailing address
Registry dates
- Enumerated
- 2007-04-24
- Last updated
- 2011-06-06
Frequently asked questions
- What is Stephen Chao's NPI number?
- Stephen Chao's National Provider Identifier (NPI) is 1083832927, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Chao's specialty?
- Stephen Chao is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Chao located?
- Stephen Chao's practice location on file with NPPES is 8110 Mango Ave Ste 106, Fontana, CA 92335-3603.
- What is Stephen Chao's phone number?
- The practice phone number listed in the NPPES registry for Stephen Chao is (909) 266-0090.
- Is Stephen Chao's NPI active?
- Yes — Stephen Chao's NPI (1083832927) is active in the NPPES registry as of the last update on 2011-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.