William Gradishar, MD
NPI 1437187929ActiveIndividual· Internal Medicine, Medical Oncology· Chicago, IL
Internal Medicine, Medical Oncology (MD) in Chicago, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1982). Their prescriptions cost Medicare Part D more than their services did: $2,339,571 for 687 claims, against $1,513,373 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 12 companies reporting payments in 2025, $56,384 in all, mostly consulting fees.
Overview
| NPI | 1437187929 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 30, 2006 |
| Last updated in NPPES | Jul 17, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 036067208 | 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 - Medical Oncology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 431 |
|---|---|
| Services billed | 87,945 across 72 procedure codes |
| Paid by Medicare | $1,513,373 |
Part D prescriptions in 2024
| Prescriptions (claims) | 687 · 1,531 30-day fills |
|---|---|
| Patients | 188 |
| Total drug cost | $2,339,571 |
| Generic share | 75% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1982 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 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
Industry payments (Open Payments)
- 2025$56,384 · 50 payments from 12 companies
- 2024$44,818 · 35 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $18,062 | 13 |
| E.R. Squibb & Sons, L.L.C. | $15,851 | 15 |
| Pfizer Inc. | $4,675 | 1 |
| Gilead Sciences, Inc. | $3,264 | 5 |
| F. Hoffmann-La Roche Ag | $2,870 | 1 |
What the 2025 payments were for
- Consulting Fee$51,930 · 22 payments
- Travel and Lodging$2,070 · 8 payments
- Food and Beverage$1,204 · 19 payments
- Compensation for serving as faculty or as a speaker for a medical education program$1,180 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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