Dheeraj Mahajan, M.D.
NPI 1831133693ActiveIndividual· Internal Medicine· Oak Park, IL
Internal Medicine (M.D.) with Cimpar SC, practicing in Oak Park, Illinois. In 2024 Medicare paid $993,906 for 3,867 patients, and Part D covered 22,074 of their prescriptions, 88% of them generic. Modernatx, Inc. reported $2,500 in payments in 2025, mostly consulting fees. Lists Loyola University Medical Center as a hospital affiliation.
Overview
| NPI | 1831133693 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 15, 2006 |
| Last updated in NPPES | Mar 17, 2026 |
| Certified by provider | Mar 17, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036106392 | IL |
| Internal Medicine | 207R00000X | 036-106392 | IL |
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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 3,867 |
|---|---|
| Services billed | 12,468 across 13 procedure codes |
| Paid by Medicare | $993,906 |
Part D prescriptions in 2024
| Prescriptions (claims) | 22,074 · 22,178 30-day fills |
|---|---|
| Patients | 261 |
| Total drug cost | $987,322 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1997 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Cimpar SCOak Park, IL · 35 clinicians
Hospital affiliation
- Loyola University Medical CenterMaywood, IL
Other facilities
- Citadel at Casa ScalabriniNursing home · Northlake, IL
- Paul House & Health Cr CtrNursing home · Chicago, IL
Industry payments (Open Payments)
- 2025$2,500 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Modernatx, Inc. | $2,500 | 1 |
What the 2025 payments were for
- Consulting Fee$2,500 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in Oak Park
- 1437497088
- 1568409910
- 1063651305
- 1467496224
- 1619603065
- 1316958754
- 1255502464
- 1497481568
- 1912559303
- 1003090077
- 1942245048
- 1770573651