Irene K. Koskan, M.D.
NPI 1831197862ActiveIndividual· Internal Medicine· Bay St Louis, MS
Internal Medicine (M.D.) with Memorial Hospital at Gulfport, practicing in Bay St Louis, Mississippi. Their prescriptions cost Medicare Part D more than their services did: $1,145,794 for 12,824 claims, against $101,359 paid for services in 2024. Lilly USA, LLC was the largest of 9 companies reporting payments in 2025, $448.26 in all, mostly food and beverage. Lists Memorial Hospital at Gulfport and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1831197862 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 13, 2005 |
| Last updated in NPPES | Sep 29, 2026 |
| Reactivated | Aug 8, 2006 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 09338 | MS |
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 (MS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 258 |
|---|---|
| Services billed | 2,119 across 22 procedure codes |
| Paid by Medicare | $101,359 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,824 · 28,243 30-day fills |
|---|---|
| Patients | 482 |
| Total drug cost | $1,145,794 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1977 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Memorial Hospital at GulfportGulfport, MS · 474 clinicians
Hospital affiliations
- Memorial Hospital at GulfportGulfport, MS
- Memorial Hospital BiloxiBiloxi, MS
- Ochsner Medical Center-HancockBay Saint Louis, MS
- Singing River GulfportGulfport, MS
Other facilities
- Enhabit Home Health of the Gulf CoastHome health agency · Gulfport, MS
- Mississippi Homecare of PicayuneHome health agency · Picayune, MS
- Vitalcaring GroupHome health agency · Gulfport, MS
Industry payments (Open Payments)
- 2025$448.26 · 23 payments from 9 companies
- 2024$671.51 · 42 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $133.06 | 8 |
| Novartis Pharmaceuticals Corporation | $69.93 | 3 |
| Beta Bionics, Inc. | $55.67 | 2 |
| Novo Nordisk Inc | $52.90 | 3 |
| Viatris Specialty LLC | $43.55 | 2 |
What the 2025 payments were for
- Food and Beverage$448.26 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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