Andrew Chao, D.O.
NPI 1780621755 · Family Medicine Physician · Downey, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Chao, D.O. is a Family Medicine Physician provider in Downey, CA (NPI 1780621755).
Provider details
- NPI number
- 1780621755
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- R2A51 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-05-31
- Last updated
- 2018-02-21
Frequently asked questions
- What is Andrew Chao's NPI number?
- Andrew Chao's National Provider Identifier (NPI) is 1780621755, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Chao's specialty?
- Andrew Chao is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Chao located?
- Andrew Chao's practice location on file with NPPES is 11411 Brookshire Ave Ste 207, Downey, CA 90241-5004.
- What is Andrew Chao's phone number?
- The practice phone number listed in the NPPES registry for Andrew Chao is (562) 904-4411.
- Does Andrew Chao accept Medicare?
- Andrew Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Chao's NPI active?
- Yes — Andrew Chao's NPI (1780621755) is active in the NPPES registry as of the last update on 2018-02-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.