Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Tommy Ho-Yin Chen, M.D.

Dermatology Physician in Pasadena, CA · enumerated 2006.

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

National Provider Identifier

1326136854

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Registry record

Entity type Individual (Type 1)

Name Dr. Tommy Ho-Yin Chen

Credential M.D.

Sex Male

Practice address 50 Bellefontaine St, #301, Pasadena, CA, 91105

Phone (626) 793-4857

Fax (626) 793-8812

Enumeration date Oct 10, 2006

Last updated in NPPES Apr 24, 2008

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License C37340 (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
00C373400	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

What specialty is Tommy Chen?

Tommy Chen is registered in NPPES with the primary taxonomy of Dermatology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-24.