Nicholas Cho Ahn, M.D.
NPI 1376983346ActiveIndividual· Internal Medicine· Springfield, IL
Internal Medicine (M.D.) in Springfield, Illinois, trained at Michigan State University College of Human Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $579,497 for 6,369 claims, against $67,849 paid for services in 2024. Pfizer Inc. was the largest of 8 companies reporting payments in 2025, $215.16 in all, mostly food and beverage.
Overview
| NPI | 1376983346 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 5, 2013 |
| Last updated in NPPES | Jun 5, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036-141124 | IL |
| Internal Medicine | 207R00000X | 4301114315 | MI |
| Psychiatry & Neurology, Psychiatry | 2084P0800X | 125.064175 | IL |
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 (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 274 |
|---|---|
| Services billed | 1,023 across 34 procedure codes |
| Paid by Medicare | $67,849 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,369 · 11,555 30-day fills |
|---|---|
| Patients | 556 |
| Total drug cost | $579,497 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Michigan State University College of Human Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Internal Medicine |
Medical group
- Wayne Memorial Community Health CentersHonesdale, PA · 52 clinicians
Hospital affiliations
- Geisinger-Community Medical CenterScranton, PA
- Wayne Memorial HospitalHonesdale, PA
Industry payments (Open Payments)
- 2025$215.16 · 10 payments from 8 companies
- 2024$2,228 · 148 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $41.87 | 2 |
| Lilly USA, LLC | $38.22 | 2 |
| Abbvie Inc. | $33.57 | 1 |
| Verona Pharma, Inc. | $23.90 | 1 |
| Dexcom, Inc. | $22.91 | 1 |
What the 2025 payments were for
- Food and Beverage$215.16 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 212 internal medicine physicians in Springfield · All internal medicine physicians in Illinois