John Myunghoon Pyun, MD
NPI 1851822639ActiveIndividual· Ophthalmology· Pinole, CA
Ophthalmology (MD) in Pinole, California, trained at State University of Ny Upstate Medical University (class of 2017). In 2024 Medicare paid $268,991 for 704 patients, and Part D covered 1,074 of their prescriptions, 66% of them generic. Alcon Vision LLC was the largest of 4 companies reporting payments in 2025, $358.06 in all, mostly food and beverage.
Overview
| NPI | 1851822639 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 23, 2017 |
| Last updated in NPPES | Aug 13, 2021 |
| Certified by provider | Aug 13, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | A160887 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 704 |
|---|---|
| Services billed | 2,549 across 28 procedure codes |
| Paid by Medicare | $268,991 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,074 · 2,306 30-day fills |
|---|---|
| Patients | 377 |
| Total drug cost | $60,808 |
| Generic share | 66% of claims |
Education and affiliations
| Medical school | State University of Ny Upstate Medical University |
|---|---|
| Graduation year | 2017 |
| Medicare specialty | Ophthalmology |
Medical groups
- East Bay OphthalmologyPinole, CA · 4 clinicians
- Tory Prestera MD Inc.San Marcos, CA · 3 clinicians
Hospital affiliation
Industry payments (Open Payments)
- 2025$358.06 · 7 payments from 4 companies
- 2024$65.15 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $162.13 | 2 |
| Sun Pharmaceutical Industries Inc. | $152.52 | 3 |
| Thea Pharma Inc. | $22.89 | 1 |
| Amgen Inc. | $20.52 | 1 |
What the 2025 payments were for
- Food and Beverage$358.06 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other ophthalmologists in Pinole
- 1477511806
- 1699720946
- 1831169010
- 1083722144
- 1821231051
- 1871783308