Roy Won, M.D.
NPI 1225470354 · Colon & Rectal Surgery Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Roy Won, M.D. is a Colon & Rectal Surgery Physician provider in Fullerton, CA (NPI 1225470354).
Provider details
- NPI number
- 1225470354
- Entity type
- Individual
- Primary specialty
- Colon & Rectal Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- S6980 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tramadol Hcl | 23 | 23 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 22 | 19 |
| Metronidazole | 20 | 19 |
| Neomycin Sulfate | 19 | 18 |
| Hydrocortisone | 14 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 15655 Cypress Wood Medical Dr Ste 100Houston, TX 77014-1487Phone: (713) 442-1700
- 106 Vision Park BlvdShenandoah, TX 77384-3000Phone: (713) 442-1800
Registry dates
- Enumerated
- 2013-07-17
- Last updated
- 2025-08-25
- Certified
- 2025-08-25
Frequently asked questions
- What is Roy Won's NPI number?
- Roy Won's National Provider Identifier (NPI) is 1225470354, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Roy Won's specialty?
- Roy Won is listed in the NPPES registry with a primary specialty of Colon & Rectal Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Roy Won located?
- Roy Won's practice location on file with NPPES is 1950 Sunny Crest Dr Ste 3500, Fullerton, CA 92835-3646.
- What is Roy Won's phone number?
- The practice phone number listed in the NPPES registry for Roy Won is (714) 408-4249.
- Does Roy Won accept Medicare?
- Roy Won is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Roy Won's NPI active?
- Yes — Roy Won's NPI (1225470354) is active in the NPPES registry as of the last update on 2025-08-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.