Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Aaron Chen, D.O.

Dermatology Physician in San Francisco, CA · enumerated 2016.

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

National Provider Identifier

1780043703

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Registry record

Entity type Individual (Type 1)

Name Dr. Aaron Chen

Credential D.O.

Sex Male

Practice address 2001 Union St Ste 520, San Francisco, CA, 94123

Phone (415) 922-3344

Fax (415) 921-7759

Enumeration date Feb 18, 2016

Last updated in NPPES Jan 3, 2024

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License OS15102 (FL) Secondary

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 22080 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

Is NPI 1780043703 active?

Yes, as of the latest NPPES snapshot, NPI 1780043703 is active (record last updated 2024-01-03).

How do I verify Aaron Chen's NPI record?

Cross-check NPI 1780043703 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-03.