NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Diana Chan, M.D.

Internal Medicine Physician in Berkeley Heights, NJ · enumerated 2008.

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

National Provider Identifier

1235399288

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Registry record

Entity type Individual (Type 1)
Name Diana Chan
Credential M.D.
Sex Female
Practice address Berkeley Heights, NJ, 07922
Phone (908) 273-4300
Enumeration date Jun 12, 2008
Last updated in NPPES Sep 23, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 25MA08988900 (NJ) 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

What is the NPI number for Diana Chan?
The National Provider Identifier (NPI) for Diana Chan is 1235399288, a Type 1 (individual) record in the CMS NPPES registry.
Where does Diana Chan practice?
The practice location on file with NPPES is in Berkeley Heights, NJ. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-23.