Jeffrey Patrick Michalak, DO
NPI 1962622431ActiveIndividual· Internal Medicine, Gastroenterology· Dakota Dunes, SD
Internal Medicine, Gastroenterology (DO) in Dakota Dunes, South Dakota, trained at Kansas City University of Med & Biosciences, College of Osteo Med (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $480,191 for 3,524 claims, against $130,911 paid for services in 2024. Janssen Biotech, Inc. was the largest of 7 companies reporting payments in 2025, $373.89 in all, mostly food and beverage.
Overview
| NPI | 1962622431 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 26, 2007 |
| Last updated in NPPES | Dec 10, 2025 |
| Certified by provider | Dec 10, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 8388 | SD |
| Internal Medicine, Gastroenterology | 207RG0100X | 933 | NE |
| Internal Medicine, Gastroenterology | 207RG0100X | DO-04307 | IA |
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 - Gastroenterology (IA); Practitioner - Gastroenterology (NE); Practitioner - Gastroenterology (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 753 |
|---|---|
| Services billed | 1,296 across 37 procedure codes |
| Paid by Medicare | $130,911 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,524 · 4,372 30-day fills |
|---|---|
| Patients | 1,099 |
| Total drug cost | $480,191 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | Kansas City University of Med & Biosciences, College of Osteo Med |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Gastroenterology |
Medical group
- Cnos PCSioux City, IA · 99 clinicians
Hospital affiliations
- Buena Vista Regional Medical CenterStorm Lake, IA
- Burgess Health CenterOnawa, IA
- Dunes Surgical HospitalDakota Dunes, SD
- Floyd Valley HealthcareLe Mars, IA
- St Lukes Regional Medical CenterSioux City, IA
Industry payments (Open Payments)
- 2025$373.89 · 21 payments from 7 companies
- 2024$287.72 · 15 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $205.02 | 12 |
| Takeda Pharmaceuticals U.S.A., Inc. | $65.74 | 3 |
| Celltrion USA Inc. | $29.93 | 2 |
| Lilly USA, LLC | $22.32 | 1 |
| Genzyme Corporation | $21.91 | 1 |
What the 2025 payments were for
- Food and Beverage$364.65 · 20 payments
- Education$9.24 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Dakota Dunes
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- 1396717229
- 1174985568
All Internal Medicine, Gastroenterology providers in South Dakota →