Mariusz Milejczyk, MD
NPI 1467598235ActiveIndividual· Internal Medicine· Libertyville, IL
Internal Medicine (MD) in Libertyville, Illinois, licensed in IL, with an NPI issued in January 2007. Their prescriptions cost Medicare Part D more than their services did: $546,360 for 5,841 claims, against $121,754 paid for services in 2024. Novo Nordisk Inc was the largest of 3 companies reporting payments in 2025, $372.83 in all, mostly food and beverage. Lists Advocate Condell Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1467598235 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 29, 2007 |
| Last updated in NPPES | Dec 27, 2024 |
| Certified by provider | Dec 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036093940 | IL |
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 | 162 |
|---|---|
| Services billed | 8,119 across 54 procedure codes |
| Paid by Medicare | $121,754 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,841 · 11,367 30-day fills |
|---|---|
| Patients | 253 |
| Total drug cost | $546,360 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 1990 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwestern Lake Forest HospitalLake Forest, IL
- Vista Medical Center EastWaukegan, IL
Other facilities
- Vita Health Care, IncHome health agency · Northbrook, IL
Industry payments (Open Payments)
- 2025$372.83 · 7 payments from 3 companies
- 2024$331.56 · 16 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $228.83 | 5 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $122.10 | 1 |
| Abbott Laboratories | $21.90 | 1 |
What the 2025 payments were for
- Food and Beverage$372.83 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 43 internal medicine physicians in Libertyville · All internal medicine physicians in Illinois