Stephen Yoon, M.D.
NPI 1851327100ActiveIndividual· Internal Medicine· Fullerton, CA
Internal Medicine (M.D.) in Fullerton, California, trained at Rutgers New Jersey Medical School (class of 1998). In 2024 Medicare paid $55,688 for 256 patients, and Part D covered 502 of their prescriptions, 86% of them generic. Pfizer Inc. was the largest of 5 companies reporting payments in 2025, $234.14 in all, mostly food and beverage.
Overview
| NPI | 1851327100 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 25, 2006 |
| Last updated in NPPES | May 13, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A71645 | CA |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 256 |
|---|---|
| Services billed | 675 across 11 procedure codes |
| Paid by Medicare | $55,688 |
Part D prescriptions in 2024
| Prescriptions (claims) | 502 · 558 30-day fills |
|---|---|
| Patients | 186 |
| Total drug cost | $30,136 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | Rutgers New Jersey Medical School |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Hospice/Palliative Care |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliation
- Providence St. Jude Medical CenterFullerton, CA
Industry payments (Open Payments)
- 2025$234.14 · 8 payments from 5 companies
- 2024$144.59 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $90.21 | 4 |
| Abiomed | $60.27 | 1 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $33.35 | 1 |
| Atricure, Inc. | $25.21 | 1 |
| E.R. Squibb & Sons, L.L.C. | $25.10 | 1 |
What the 2025 payments were for
- Food and Beverage$234.14 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 56 internal medicine physicians in Fullerton · All internal medicine physicians in California