Paul Chao Yuan Sun, M.D.
NPI 1861599193ActiveIndividual· Otolaryngology· Laguna Hills, CA
Otolaryngology (M.D.) in Laguna Hills, California, trained at Washington University School of Medicine (class of 1994). 547 Medicare patients in 2024, $153,164 paid; nearly all of their 963 Part D prescriptions were generic (97%). Regeneron Healthcare Solutions, Inc. was the largest of 5 companies reporting payments in 2025, $511.91 in all, mostly food and beverage.
Overview
| NPI | 1861599193 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 20, 2006 |
| Last updated in NPPES | Aug 16, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Otolaryngology Primary | 207Y00000X | G86526 | CA |
| Specialist | 174400000X | BS4682363 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Otolaryngology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 547 |
|---|---|
| Services billed | 1,784 across 37 procedure codes |
| Paid by Medicare | $153,164 |
Part D prescriptions in 2024
| Prescriptions (claims) | 963 · 1,428 30-day fills |
|---|---|
| Patients | 347 |
| Total drug cost | $68,595 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | Washington University School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Otolaryngology |
Medical group
- Orange County Ear Nose and ThroatIrvine, CA · 3 clinicians
Hospital affiliations
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
Industry payments (Open Payments)
- 2025$511.91 · 22 payments from 5 companies
- 2024$218.84 · 8 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Regeneron Healthcare Solutions, Inc. | $188.78 | 10 |
| Genzyme Corporation | $180.06 | 6 |
| Glaxosmithkline, LLC. | $99.63 | 4 |
| Inspire Medical Systems, Inc. | $23.06 | 1 |
| Optinose US, Inc. | $20.38 | 1 |
What the 2025 payments were for
- Food and Beverage$511.91 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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