Gregory James Gerstner, M.D.
NPI 1629288659ActiveIndividual· Internal Medicine, Hematology & Oncology· Peoria, IL
Internal Medicine, Hematology & Oncology (M.D.) in Peoria, Illinois, trained at Southern Illinois University School of Medicine (class of 2002). In 2024 Medicare paid $6,121,220 for 1,262 patients, and Part D covered 3,541 of their prescriptions, 78% of them generic. Pfizer Inc. reported $30.65 in payments in 2025, mostly education.
Overview
| NPI | 1629288659 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 22, 2007 |
| Last updated in NPPES | Mar 2, 2026 |
| Certified by provider | Mar 2, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 036.120707 | IL |
| Internal Medicine, Hematology & Oncology | 207RH0003X | PG PERMIT# 80968 | AZ |
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 - Hematology/Oncology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,262 |
|---|---|
| Services billed | 356,327 across 208 procedure codes |
| Paid by Medicare | $6,121,220 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,541 · 4,912 30-day fills |
|---|---|
| Patients | 432 |
| Total drug cost | $8,633,958 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Southern Illinois University School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- Oncology-Hematology Associates of Central Illinois P CPeoria, IL · 67 clinicians
Hospital affiliations
- Carle Health Methodist HospitalPeoria, IL
- Osf Saint Clare Medical CenterPrinceton, IL
- Osf Saint Elizabeth Mdl CtrPeru, IL
- Osf Saint Paul Medical CenterMendota, IL
- Saint Francis Medical CenterPeoria, IL
Industry payments (Open Payments)
- 2025$30.65 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $30.65 | 1 |
What the 2025 payments were for
- Education$30.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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