Roy Pillsub Won, M.D.
Colon & Rectal Surgery Physician · Fullerton, CA
Roy Pillsub Won, M.D. is a colon & rectal surgery physician with a practice address in Fullerton, California, and NPI 1225470354, issued on Jul 17, 2013. Check the license (California A134883, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Roy Pillsub Won
- Credential
- M.D.
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License numbers
- A134883 CA
S6980 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1950 Sunny Crest Dr Ste 3500, Fullerton, CA 92835
- Phone
- (714) 408-4249
- Enumerated
- Jul 17, 2013
- Record last updated
- Aug 25, 2025
- Fax
- (714) 525-0123
- Medicaid IDs
- 415263901 TX
415263903 TX
415263902 TX - Medicare enrollment
- Enrolled (PECOS I20250528000446); accepts Medicare assignment
- Medical or professional school
- University Of Cincinnati College Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 198 in California → Look up another NPI →
Also registered at 1950 Sunny Crest Dr Ste 3500
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Leila AbuhadbaPhysician Assistant1831876119
- Saif Ahmed, DOSurgery Physician1669911574
- Razmik Ghukasyan, M.D.Surgery Physician1164953071
- Emily Hipwell, PA-CPhysician Assistant1447988092
- Karen Huynh, PA-CPhysician Assistant1194402628
- Kevin Kinzinger, M.D.Colon & Rectal Surgery Physician1760554232
Verify Roy Pillsub Won in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A134883Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% fewer Medicare Part D claims than the average colon & rectal surgery physician in 2024
140 Medicare Part D claims for 68 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 27 claims were for opioids.
Most prescribed
- Tramadol Hcl23 claims
- Sod Sulf-Potass Sulf-Mag Sulf22 claims
- Metronidazole20 claims
- Neomycin Sulfate19 claims
- Hydrocortisone14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Kaiser Foundation Health Plan OF The Mid Atlantic States, IncLargo, MD
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Roy Pillsub Won among 198 colon & rectal surgery physician records in California
Roy Pillsub Won, M.D. is one of 198 colon & rectal surgery physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 79% of them.
- NPI issued2013 · 79% of these records are older, 15% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated2013 · median 2002 among the 149 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in California
There are 198 colon & rectal surgery physician records in California.
All 198 in California → Every provider in Fullerton → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Kevin Kinzinger, M.D.Fullerton, CA 928351760554232
- Dong Hum Yoon, MDFullerton, CA 928351477915767
- Anil Bahadursingh, MDAnaheim, CA 928071750485363
- Henry Hwu, MDAnaheim, CA 928071891843702
- Maryam Saidy, M.D.Anaheim, CA 928061669792263
- Joseph Carmichael, MDOrange, CA 928681427175827
- Anita Gregory, M.D.Orange, CA 928681881655868
- George Moro, M.D.Orange, CA 928681255416715
Common questions
What is Roy Pillsub Won, M.D.'s NPI number?
Roy Pillsub Won, M.D.'s National Provider Identifier (NPI) is 1225470354, issued on Jul 17, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Roy Pillsub Won, M.D. located?
The NPPES record lists a practice address at 1950 Sunny Crest Dr Ste 3500, Fullerton, CA, 92835. Phone: (714) 408-4249. Providers update this record themselves, so call before visiting.
How can I verify Roy Pillsub Won, M.D.'s license?
NPPES lists California license number A134883, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Roy Pillsub Won, M.D. prescribe under Medicare Part D?
In 2024, Roy Pillsub Won, M.D. had 140 Medicare Part D claims for 68 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.