Irena Zalewska, MD
NPI 1407846751ActiveIndividual· Internal Medicine, Gastroenterology· St Clair Shores, MI
Internal Medicine, Gastroenterology (MD) in St Clair Shores, Michigan, trained at Wayne State University School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,181,169 for 1,073 claims, against $82,340 paid for services in 2024. Janssen Biotech, Inc. was the largest of 3 companies reporting payments in 2025, $185.73 in all, mostly food and beverage.
Overview
| NPI | 1407846751 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 27, 2005 |
| Last updated in NPPES | Jun 29, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 4301072116 | MI |
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 (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 353 |
|---|---|
| Services billed | 1,498 across 35 procedure codes |
| Paid by Medicare | $82,340 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,073 · 2,429 30-day fills |
|---|---|
| Patients | 312 |
| Total drug cost | $1,181,169 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Wayne State University School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Henry Ford Health SystemDetroit, MI · 2,570 clinicians
Hospital affiliations
- Henry Ford Health HospitalDetroit, MI
- Henry Ford Health West Bloomfield HospitalW Bloomfield, MI
- Henry Ford Macomb HospitalClinton Township, MI
Industry payments (Open Payments)
- 2025$185.73 · 3 payments from 3 companies
- 2024$1,965 · 83 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $149.94 | 1 |
| Amgen Inc. | $18.13 | 1 |
| Aimmune Therapeutics, Inc. | $17.66 | 1 |
What the 2025 payments were for
- Food and Beverage$185.73 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Gastroenterology providers in Michigan →