What is Nelson Chang's NPI number?

Nelson Chang's National Provider Identifier (NPI) is 1689316648, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Nelson Chang's specialty?

Nelson Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Nelson Chang located?

Nelson Chang's practice location on file with NPPES is 2151 W Grant Line Rd, Tracy, CA 95377-7309.

What is Nelson Chang's phone number?

The practice phone number listed in the NPPES registry for Nelson Chang is (209) 373-2816.

Is Nelson Chang's NPI active?

Yes — Nelson Chang's NPI (1689316648) is active in the NPPES registry as of the last update on 2026-05-27.

IndividualActive

Nelson Chang, MD

NPI 1689316648 · Family Medicine Physician · Tracy, CA

Nelson Chang, MD is a Family Medicine Physician provider in Tracy, CA (NPI 1689316648).

Provider details

NPI number: 1689316648
Entity type: Individual
Primary specialty: Family Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: A190393 (CA)

Specialties & taxonomies

Family Medicine PhysicianPrimary207Q00000XLicense A190393 (CA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(60/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
4 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

2151 W Grant Line Rd

Tracy, CA 95377-7309

Phone: (209) 373-2816

Fax: (209) 373-2873

Street-level locationGet directions

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Mailing address