Ghassan Zalzaleh, MD
NPI 1992704035ActiveIndividual· Internal Medicine, Hematology & Oncology· Oak Lawn, IL
Internal Medicine, Hematology & Oncology (MD) with Affiliated Oncologists LLC, practicing in Oak Lawn, Illinois. In 2024 Medicare paid $3,814,822 for 679 patients, and Part D covered 564 of their prescriptions, 71% of them generic. Astrazeneca Pharmaceuticals LP was the largest of 56 companies reporting payments in 2025, $7,634 in all, mostly food and beverage. Lists Advocate Christ Hospital & Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1992704035 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 20, 2005 |
| Last updated in NPPES | Jul 10, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 036089713 | 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 | 679 |
|---|---|
| Services billed | 192,003 across 147 procedure codes |
| Paid by Medicare | $3,814,822 |
Part D prescriptions in 2024
| Prescriptions (claims) | 564 · 732 30-day fills |
|---|---|
| Patients | 173 |
| Total drug cost | $1,298,190 |
| Generic share | 71% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | General Practice |
Medical group
- Affiliated Oncologists LLCMokena, IL · 44 clinicians
Hospital affiliations
- Advocate Christ Hospital & Medical CenterOak Lawn, IL
- Advocate Trinity HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
- Silver Cross Hospital and Medical CentersNew Lenox, IL
Other facilities
- Capital Hospice & Palliative Care LLCHospice · Oakbrook Terrace, IL
Industry payments (Open Payments)
- 2025$7,634 · 212 payments from 56 companies
- 2024$16,234 · 204 payments from 49 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $1,944 | 17 |
| Beigene USA, Inc. | $1,140 | 3 |
| Novartis Pharmaceuticals Corporation | $363.79 | 23 |
| Pfizer Inc. | $251.68 | 15 |
| Daiichi Sankyo Inc. | $238.90 | 11 |
What the 2025 payments were for
- Food and Beverage$4,555 · 206 payments
- Consulting Fee$2,775 · 2 payments
- Education$303.97 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Oak Lawn
- 1497964753
- 1649808544
- 1356421325
- 1710072624
- 1598765166
- 1902364938
- 1245307305
- 1073539680
- 1124587365
- 1356439178
- 1982053013
- 1043242860
All Internal Medicine, Hematology & Oncology providers in Illinois →