Leonard Klein
Hematology & Oncology · Niles, ILNPI 1255328878
Payments from drug & device makers
Across 572 payments — averaging $3350.36 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Bristol Myers Squibb$746K
- Incyte Corporation$133K
- Seagen Inc.$128K
- TG Therapeutics, Inc.$95K
- AbbVie$89K
- Genentech, Inc.$89K
- plus $637K from 26 others
Across 4 payments — averaging $3107.97 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- AstraZeneca$8K
- Takeda Pharmaceuticals U.S.A., Inc.$2K
- Acerta Pharma LLC$1K
- Eli Lilly$1K
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Bristol Myers Squibb | 14 | $746,441 |
| Incyte Corporation | 135 | $133,101 |
| Seagen Inc. | 58 | $127,562 |
| TG Therapeutics, Inc. | 48 | $94,655 |
| AbbVie | 9 | $89,186 |
| Genentech, Inc. | 35 | $88,836 |
| Novartis | 20 | $83,906 |
| Gilead | 19 | $82,454 |
| Takeda Pharmaceuticals U.S.A., Inc. | 41 | $72,248 |
| E.r. Squibb & Sons, L.L.C. | 13 | $68,685 |
| AstraZeneca(2 entities) | 11 | $64,911 |
| Janssen Research & Development, LLC | 79 | $63,326 |
| Eli Lilly | 15 | $39,541 |
| Pfizer | 19 | $38,785 |
| Acerta Pharma LLC | 5 | $35,818 |
| Epizyme, Inc. | 13 | $34,760 |
| Morphosys AG | 7 | $13,811 |
| GSK | 4 | $12,875 |
| ADC Therapeutics America, Inc. | 4 | $10,868 |
| Immunomedics, Inc. | 1 | $7,578 |
| Agios Pharmaceuticals, Inc. | 1 | $4,508 |
| Merck | 3 | $987 |
| Eisai Inc. | 2 | $981 |
| Boston Scientific | 2 | $140 |
| Lilly USA, LLC | 2 | $126 |
| Astellas Pharma US Inc | 1 | $99 |
| Pharmacyclics LLC, An Abbvie Company | 3 | $71 |
| Johnson & Johnson(2 entities) | 4 | $65 |
| Deciphera Pharmaceuticals Inc. | 1 | $28 |
| Sanofi | 1 | $19 |
| Amgen | 1 | $18 |
| Foundation Medicine, Inc. | 1 | $16 |
How this compares
$1,916,406 in reported general payments places this provider in the 90th percentile of 580 hematology & oncology providers in Illinois.
Other hematology & oncology in Niles
- David HakimianNiles$2.6M
- Richard SchilskyBurr Ridge$87.1M
- Edwin PosadasBurr Ridge$70.9M
- Oana DanciuChicago$23.2M
- Shuo MaChicago$20.5M
- Olwen HahnChicago$11.9M
- Christine BestvinaChicago$11.3M
- Russell SzmulewitzChicago$9.8M
- Randy SweisChicago$9.4M
- Hedy KindlerChicago$8.6M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.