Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Tom S Chang, MD

Q: What is the NPI number for Tom Chang?

The National Provider Identifier (NPI) for Tom Chang is 1609848969, a Type 1 (individual) record in the CMS NPPES registry.

Retina Specialist (Ophthalmology) Physician in Pasadena, CA · enumerated 2006.

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

National Provider Identifier

1609848969

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Registry record

Entity type Individual (Type 1)

Name Tom S Chang

Credential MD

Sex Male

Practice address 100 E California Blvd, Pasadena, CA, 91105

Phone (626) 568-8838

Fax (626) 583-8838

Enumeration date Feb 2, 2006

Last updated in NPPES Aug 7, 2020

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License A69909 (CA) Secondary

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License A69909 (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
00A699090	Other	-	BLUE CROSS
1609848969	Medicaid	CA	-
00A699090	Medicaid	CA	-

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.

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Frequently asked questions

Where does Tom Chang practice?

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

What is the NPI number for Tom Chang?

The National Provider Identifier (NPI) for Tom Chang is 1609848969, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Retina Institute of California Medical Group, A California Medical Par Ophthalmology Physician · Pasadena, CA NPI 1760541569 Jessica Boeckmann Ophthalmology Physician · Pasadena, CA NPI 1629210679 Jennifer Spiegel Ophthalmology Physician · Pasadena, CA NPI 1912136938 Lily Lee Plastic and Reconstructive Surgery Physician · Pasadena, CA NPI 1730311226 Jeffrey Stevens Retina Specialist (Ophthalmology) Physician · Pasadena, CA NPI 1114254711 Ling Bei Ophthalmology Physician · Pasadena, CA NPI 1164740460 Trilogy Eye Medical Group Inc Ophthalmology Physician · Pasadena, CA NPI 1114205432 Jessica Young Optometrist · Pasadena, CA NPI 1043565435

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-07.