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Ann Chang, MD
NPI 1952437527 · Internal Medicine Physician · Fairfield, CA
Ann Chang, MD is a Internal Medicine Physician provider in Fairfield, CA (NPI 1952437527).
Provider details
- NPI number
- 1952437527
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A63839 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(89/100 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
1550 Gateway Blvd
Fairfield, CA 94533-6901
Phone: (707) 427-4000
Street-level locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2007-02-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Ann Chang's NPI number?
- Ann Chang's National Provider Identifier (NPI) is 1952437527, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Chang's specialty?
- Ann Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ann Chang located?
- Ann Chang's practice location on file with NPPES is 1550 Gateway Blvd, Fairfield, CA 94533-6901.
- What is Ann Chang's phone number?
- The practice phone number listed in the NPPES registry for Ann Chang is (707) 427-4000.
- Is Ann Chang's NPI active?
- Yes — Ann Chang's NPI (1952437527) 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.