Douglas Edward Merkel, MD
NPI 1235156811ActiveIndividual· Internal Medicine, Medical Oncology· Evanston, IL
Internal Medicine, Medical Oncology (MD) in Evanston, Illinois, trained at Northwestern University Feinberg Medical School (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $3,299,678 for 2,150 claims, against $96,899 paid for services in 2024.
Overview
| NPI | 1235156811 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 17, 2006 |
| Last updated in NPPES | Oct 6, 2020 |
| Certified by provider | Oct 6, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 036065572 | 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 - Medical Oncology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 777 |
|---|---|
| Services billed | 1,837 across 14 procedure codes |
| Paid by Medicare | $96,899 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,150 · 4,640 30-day fills |
|---|---|
| Patients | 466 |
| Total drug cost | $3,299,678 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Medical Oncology |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwest Community Hospital 1Arlington Heights, IL
- Northwestern Lake Forest HospitalLake Forest, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Medical Oncology providers in Evanston
- 1073959565
- 1740349695
- 1942445648
- 1932132743
- 1639388226
- 1851324503
- 1205821857
- 1629094958
- 1134145469
- 1174564116
- 1366484313
- 1699063644
All Internal Medicine, Medical Oncology providers in Illinois →