Robert Chang, MD
NPI 1194954453 · Family Medicine Physician · Tustin, CA
Robert Chang, MD is a Family Medicine Physician provider in Tustin, CA (NPI 1194954453).
Provider details
- NPI number
- 1194954453
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 800 N Main StSanta Ana, CA 92701-3576Phone: (714) 456-7002
Registry dates
- Enumerated
- 2009-07-08
- Last updated
- 2022-07-27
- Certified
- 2022-07-27
Frequently asked questions
- What is Robert Chang's NPI number?
- Robert Chang's National Provider Identifier (NPI) is 1194954453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Chang's specialty?
- Robert Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Chang located?
- Robert Chang's practice location on file with NPPES is 2560 Bryan Ave Ste a, Tustin, CA 92782-8922.
- What is Robert Chang's phone number?
- The practice phone number listed in the NPPES registry for Robert Chang is (714) 477-8430.
- Is Robert Chang's NPI active?
- Yes — Robert Chang's NPI (1194954453) is active in the NPPES registry as of the last update on 2022-07-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.