Mark W. Stolar, M.D.
NPI 1396784591ActiveIndividual· Internal Medicine· Woodstock, IL
Internal Medicine (M.D.) in Woodstock, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1979). Their prescriptions cost Medicare Part D more than their services did: $1,586,069 for 10,224 claims, against $128,904 paid for services in 2024.
Overview
| NPI | 1396784591 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 5, 2006 |
| Last updated in NPPES | Mar 18, 2024 |
| Certified by provider | Mar 18, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036061561 | 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 | 541 |
|---|---|
| Services billed | 2,242 across 39 procedure codes |
| Paid by Medicare | $128,904 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,224 · 22,132 30-day fills |
|---|---|
| Patients | 874 |
| Total drug cost | $1,586,069 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Central Dupage Physician GroupGeneva, IL · 1,080 clinicians
Hospital affiliations
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine McHenryMcHenry, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Other facilities
- Elara Caring IxHome health agency · Huntley, IL
- Empower Home Health ServicesHome health agency · West Dundee, IL
- Home Care ExpertsHome health agency · Burr Ridge, IL
- Journeycare - BarringtonHospice · Barrington, IL
- Shirley Ryan AbilitylabInpatient rehabilitation facility · Chicago, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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