Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alan T. Chang, M.D.

Internal Medicine Physician in Escondido, CA · enumerated 2006.

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

National Provider Identifier

1699784934

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Registry record

Entity type Individual (Type 1)

Name Alan T. Chang

Credential M.D.

Sex Male

Practice address 225 East 2nd Avenue, Escondido, CA, 92025

Phone (760) 291-6700

Fax (760) 745-1588

Enumeration date Aug 5, 2006

Last updated in NPPES Dec 12, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G79904 (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
00A623420	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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Alan Chang's NPI record?

Cross-check NPI 1699784934 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1699784934 active?

Yes, as of the latest NPPES snapshot, NPI 1699784934 is active (record last updated 2024-12-12).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-12-12.