NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Roy Pillsub Won, M.D.

Colon & Rectal Surgery Physician in Fullerton, CA · enumerated 2013.

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

National Provider Identifier

1225470354

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Roy Pillsub Won
Credential M.D.
Sex Male
Practice address 1950 Sunny Crest Dr Ste 3500, Fullerton, CA, 92835
Phone (714) 408-4249
Fax (714) 525-0123
Enumeration date Jul 17, 2013
Last updated in NPPES Aug 25, 2025

Taxonomy & licenses

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License S6980 (TX) Secondary
208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License A134883 (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
415263901 Medicaid TX -
415263903 Medicaid TX -
415263902 Medicaid TX -

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 Roy Won?
The National Provider Identifier (NPI) for Roy Won is 1225470354, a Type 1 (individual) record in the CMS NPPES registry.
Where does Roy Won practice?
The practice location on file with NPPES is in Fullerton, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-25.