Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Warren Woo, M.D.

Family Medicine Physician in Placentia, CA · enumerated 2008 · authorized official Warren Woo, Sole Proprietor.

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

National Provider Identifier

1689832008

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Registry record

Entity type Organization (Type 2)

Legal business name Warren Woo, M.D.

Practice address 1275 N Rose Dr Ste 138, Placentia, CA, 92870

Phone (714) 961-1635

Fax (714) 961-1679

Enumeration date Jun 2, 2008

Last updated in NPPES Nov 10, 2008

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License C40927 (CA) Primary

Authorized official

Name Warren Woo

Title Sole Proprietor

Phone (714) 961-1635

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

Where is Warren Woo, M.D. located?

The practice location on file with NPPES is in Placentia, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-11-10. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-10.