Gregory Warren
Hematology & Oncology · Cleveland, OHNPI 1154309243
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $941 of the $1,053 with a category attached, or 89.4%. It is spread thinly across 24 manufacturers, the largest accounting for just 15.9% — the pattern of someone who eats at a lot of different presentations. Reporting peaked in 2019 at $613 and has fallen 97.0% since, to $18 in 2023. That places this record below the midpoint for hematology & oncology clinicians in OH, where the typical reported total is $2,354.
Across 58 payments — averaging $18.15 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$168
- Johnson & Johnson$112
- Amgen$98
- Novartis$81
- Eisai Inc.$75
- Seagen Inc.$63
- plus $456 from 18 others
What the payments were for
- Food & beverage$94189%
- Education$11211%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Merck | 6 | $168 |
| Johnson & Johnson(2 entities) | 2 | $112 |
| Amgen | 5 | $98 |
| Novartis | 5 | $81 |
| Eisai Inc. | 5 | $75 |
| Seagen Inc. | 5 | $63 |
| Pharmacyclics LLC, An Abbvie Company | 3 | $55 |
| AstraZeneca | 4 | $55 |
| Bayer | 3 | $49 |
| Astellas Pharma US Inc | 2 | $37 |
| ADC Therapeutics America, Inc. | 2 | $30 |
| Pfizer | 2 | $29 |
| Genentech USA, Inc. | 2 | $25 |
| Incyte Corporation | 2 | $25 |
| Janssen Scientific Affairs, LLC | 1 | $24 |
| EMD Serono, Inc. | 1 | $18 |
| Daiichi Sankyo Inc. | 1 | $17 |
| Exelixis Inc. | 1 | $16 |
| Lilly USA, LLC | 1 | $15 |
| Jazz Pharmaceuticals Inc. | 1 | $13 |
| AbbVie | 1 | $13 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $12 |
| Gilead | 1 | $12 |
| E.r. Squibb & Sons, L.L.C. | 1 | $12 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- KEYTRUDA$104
How this compares
$1,053 in reported general payments places this provider in the 35th percentile of 450 hematology & oncology providers in Ohio.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Letrozole | 14 | $241 |
Paid to pharmacies, not to this prescriber.
Other hematology & oncology in Cleveland
- Hillard LazarusCleveland$2M
- Ronald BukowskiCleveland$594K
- Balazs HalmosCleveland$568K
- Jorge GarciaCleveland$513K
- Bachar DerghamCleveland$387K
- Brian HillCleveland$316K
- Dale ShepardCleveland$314K
- Sakti ChakrabartiCleveland$301K
- Keith McCraeCleveland$215K
- Megan KruseCleveland$166K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.