Hollis W. Walker, M.D.
NPI 1053622290ActiveIndividual· Internal Medicine, Hematology & Oncology· Elmhurst, IL
Internal Medicine, Hematology & Oncology (M.D.) in Elmhurst, Illinois, trained at Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University (class of 2010). Their prescriptions cost Medicare Part D more than their services did: $1,754,075 for 394 claims, against $92,666 paid for services in 2024. Intera Oncology, Inc was the largest of 6 companies reporting payments in 2025, $422.93 in all, mostly food and beverage.
Overview
| NPI | 1053622290 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 22, 2010 |
| Last updated in NPPES | Dec 9, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 036.141268 | 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 - Hematology/Oncology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 308 |
|---|---|
| Services billed | 1,087 across 13 procedure codes |
| Paid by Medicare | $92,666 |
Part D prescriptions in 2024
| Prescriptions (claims) | 394 · 544 30-day fills |
|---|---|
| Patients | 103 |
| Total drug cost | $1,754,075 |
| Generic share | 52% of claims |
Education and affiliations
| Medical school | Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University |
|---|---|
| Graduation year | 2010 |
| Medicare specialty | Hematology/Oncology |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Edward HospitalNaperville, IL
- Elmhurst Memorial HospitalElmhurst, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
- 2025$422.93 · 8 payments from 6 companies
- 2024$122.72 · 5 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Intera Oncology, Inc | $150.56 | 1 |
| Astrazeneca Pharmaceuticals LP | $114.64 | 1 |
| Novartis Pharmaceuticals Corporation | $55.35 | 2 |
| Pfizer Inc. | $45.57 | 2 |
| Janssen Biotech, Inc. | $33.80 | 1 |
What the 2025 payments were for
- Food and Beverage$422.93 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Elmhurst
- 1306892419
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- 1679779219
- 1326422270
- 1447663539
All Internal Medicine, Hematology & Oncology providers in Illinois →