Justin Kosirog
NPI 1255726238ActiveIndividual· Internal Medicine, Gastroenterology· Oklahoma City, OK
Internal Medicine, Gastroenterology in Oklahoma City, Oklahoma, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 2015). Their prescriptions cost Medicare Part D more than their services did: $165,469 for 514 claims, against $89,689 paid for services in 2024. Janssen Biotech, Inc. was the largest of 3 companies reporting payments in 2025, $150.23 in all, mostly education.
Overview
| NPI | 1255726238 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Apr 6, 2015 |
| Last updated in NPPES | May 27, 2020 |
| Certified by provider | May 27, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 35686 | OK |
| 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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 357 |
|---|---|
| Services billed | 1,986 across 45 procedure codes |
| Paid by Medicare | $89,689 |
Part D prescriptions in 2024
| Prescriptions (claims) | 514 · 724 30-day fills |
|---|---|
| Patients | 242 |
| Total drug cost | $165,469 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Gastroenterology |
Medical group
- Illinois Gastroenterology Group LLCArlington Heights, IL · 115 clinicians
Hospital affiliations
- Advocate Sherman HospitalElgin, IL
- Northwestern Medicine McHenryMcHenry, IL
- Saint Joseph Hospital-ElginElgin, IL
- St Alexius Medical CenterHoffman Estates, IL
Industry payments (Open Payments)
- 2025$150.23 · 3 payments from 3 companies
- 2024$67.71 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $99.99 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $26.43 | 1 |
| Abbvie Inc. | $23.81 | 1 |
What the 2025 payments were for
- Education$99.99 · 1 payment
- Food and Beverage$50.24 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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