Mark Riederman, M.D.
NPI 1699782151ActiveIndividual· Internal Medicine· Libertyville, IL
Internal Medicine (M.D.) in Libertyville, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $752,758 for 6,787 claims, against $201,851 paid for services in 2024. Novo Nordisk Inc was the largest of 13 companies reporting payments in 2025, $1,415 in all, mostly food and beverage.
Overview
| NPI | 1699782151 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 1, 2006 |
| Last updated in NPPES | Oct 24, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036063570 | 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 | 563 |
|---|---|
| Services billed | 3,459 across 41 procedure codes |
| Paid by Medicare | $201,851 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,787 · 17,937 30-day fills |
|---|---|
| Patients | 650 |
| Total drug cost | $752,758 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Lake Forest Internal Medicine LtdLibertyville, IL · 2 clinicians
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine McHenryMcHenry, IL
Other facilities
- Advocate Home Health Care ServHome health agency · Oakbrook, IL
- Assure Home Healthcare, IncHome health agency · Libertyville, IL
Industry payments (Open Payments)
- 2025$1,415 · 69 payments from 13 companies
- 2024$1,968 · 91 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $307.33 | 13 |
| Lilly USA, LLC | $209.28 | 11 |
| Sanofi Pasteur Inc. | $180.57 | 5 |
| Pfizer Inc. | $177.05 | 9 |
| Merck Sharp & Dohme LLC | $112.08 | 6 |
What the 2025 payments were for
- Food and Beverage$1,415 · 69 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