Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nelson Yoium-Tsiu Chang, MD

Q: What is the NPI number for Nelson Chang?

The National Provider Identifier (NPI) for Nelson Chang is 1689316648, a Type 1 (individual) record in the CMS NPPES registry.

Family Medicine Physician in Tracy, CA · enumerated 2022.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1689316648

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Nelson Yoium-Tsiu Chang

Credential MD

Sex Male

Practice address 2151 W Grant Line Rd, Tracy, CA, 95377

Phone (209) 373-2816

Fax (209) 373-2873

Enumeration date Apr 11, 2022

Last updated in NPPES May 27, 2026

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License A190393 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Nelson Chang?

The National Provider Identifier (NPI) for Nelson Chang is 1689316648, a Type 1 (individual) record in the CMS NPPES registry.

Where does Nelson Chang practice?

The practice location on file with NPPES is in Tracy, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-27.