Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Irene Joan Chang, M.D.

Clinical Genetics (M.D.) Physician in San Francisco, CA · enumerated 2014.

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

National Provider Identifier

1033539671

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Irene Joan Chang

Credential M.D.

Sex Female

Practice address 1825 4th St Fl 6, San Francisco, CA, 94143

Phone (415) 476-2757

Enumeration date Apr 22, 2014

Last updated in NPPES Aug 29, 2024

Taxonomy & licenses

207SG0201X Clinical Genetics (M.D.) Physician Allopathic & Osteopathic Physicians · License 60654898 (WA) Secondary

207SG0202X Clinical Biochemical Genetics Physician Allopathic & Osteopathic Physicians · License MD60654898 (WA) Secondary

207SG0201X Clinical Genetics (M.D.) Physician Allopathic & Osteopathic Physicians · License A186751 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
1033539671	Medicaid	WA	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Irene Chang?

Irene Chang is registered in NPPES with the primary taxonomy of Clinical Genetics (M.D.) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-29.