Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alvin Chang, M.D.

Geriatric Medicine (Internal Medicine) Physician in Tustin, CA · enumerated 2006.

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

National Provider Identifier

1396857181

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Registry record

Entity type Individual (Type 1)

Name Dr. Alvin Chang

Credential M.D.

Sex Male

Practice address 1101 Bryan Ave, Suite E, Tustin, CA, 92780

Phone (714) 352-5800

Fax (714) 352-5801

Enumeration date Aug 31, 2006

Last updated in NPPES Sep 19, 2016

Taxonomy & licenses

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A55330 (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
W18492	Other	-	MEDICARE GRP NUMBER
00A553300	Medicaid	CA	-
1699040170	Other	CA	OCSC GROUP NPI
DT9847	Other	CA	OCSC GROUP PTAN

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 NPI 1396857181 active?

Yes, as of the latest NPPES snapshot, NPI 1396857181 is active (record last updated 2016-09-19).

How do I verify Alvin Chang's NPI record?

Cross-check NPI 1396857181 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-09-19.