Eugene Won, MD
NPI 1659799658 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Orange, CA
Enrolled with Medicare as Practitioner - Thoracic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eugene Won, MD is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Orange, CA (NPI 1659799658).
Provider details
- NPI number
- 1659799658
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
121 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Coronary Artery Bypass Using Artery Graft, 1 Graft33533 | 26 | $723 |
| Harvest of Vein Using an Endoscope33508 | 25 | $6 |
| Exclusion of Appendage of Left Upper Chamber of Heart Performed During Other Procedure on Chest33268 | 23 | $47 |
| Replacement of Aortic Valve Through the Skin and Femoral Artery33361 | 19 | $737 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 15 | $138 |
| Coronary Artery Bypass Using Vein Or Artery Graft, 2 Grafts33518 | 13 | $191 |
Typical Medicare-allowed amounts for these services range $6–$737 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,556 across 18 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-04-07
- Last updated
- 2022-06-01
- Certified
- 2022-06-01
Frequently asked questions
- What is Eugene Won's NPI number?
- Eugene Won's National Provider Identifier (NPI) is 1659799658, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eugene Won's specialty?
- Eugene Won is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Eugene Won located?
- Eugene Won's practice location on file with NPPES is 1310 W Stewart Dr Ste 503, Orange, CA 92868-3856.
- What is Eugene Won's phone number?
- The practice phone number listed in the NPPES registry for Eugene Won is (714) 997-2224.
- Does Eugene Won accept Medicare?
- Eugene Won is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eugene Won's NPI active?
- Yes — Eugene Won's NPI (1659799658) is active in the NPPES registry as of the last update on 2022-06-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.