Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Yow Jung Chang, MD

Critical Care Medicine (Internal Medicine) Physician in Monterey Park, CA · enumerated 2014.

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

National Provider Identifier

1003236688

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Registry record

Entity type Individual (Type 1)

Name William Yow Jung Chang

Credential MD

Sex Male

Practice address 500 N Garfield Ave Ste 204, Monterey Park, CA, 91754

Phone (626) 280-4393

Enumeration date Apr 22, 2014

Last updated in NPPES Aug 18, 2021

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License A140305 (CA) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A140305 (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

How do I verify William Chang's NPI record?

Cross-check NPI 1003236688 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1003236688 active?

Yes, as of the latest NPPES snapshot, NPI 1003236688 is active (record last updated 2021-08-18).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-08-18.