Steven Buck, DO
Hematology & Oncology · Tulsa, OKNPI 1154373835
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $491 of the $686 with a category attached, or 71.5%. 10 manufacturers reported payments, led by Pfizer at 30.5% of the total. Reporting peaked in 2020 at $229 and has fallen 88.5% since, to $26 in 2024. That places this record below the midpoint for hematology & oncology clinicians in OK, where the typical reported total is $2,658.
Across 27 payments — averaging $25.42 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Pfizer$209
- Sirtex Medical Inc$180
- E.r. Squibb & Sons, L.L.C.$134
- Karyopharm Therapeutics Inc.$35
- AstraZeneca$30
- Acadia Pharmaceuticals Inc$26
- plus $71 from 4 others
Across 1 payment — averaging $182.70 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.
- E.r. Squibb & Sons, L.L.C.$183
What the payments were for
- Food & beverage$49172%
- Education$19528%
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 |
|---|---|---|
| Pfizer | 14 | $209 |
| Sirtex Medical Inc | 2 | $180 |
| E.r. Squibb & Sons, L.L.C. | 3 | $134 |
| Karyopharm Therapeutics Inc. | 1 | $35 |
| AstraZeneca | 2 | $30 |
| Acadia Pharmaceuticals Inc | 1 | $26 |
| Taiho Oncology, Inc. | 1 | $23 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $19 |
| Beigene USA, Inc. | 1 | $18 |
| Gilead | 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.
- SIR-Spheres Microspheres$145
- OPDIVO$120
How this compares
$686 in reported general payments places this provider in the 20th percentile of 118 hematology & oncology providers in Oklahoma.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Other hematology & oncology in Tulsa
- Caleb ScheckelTulsa$159K
- Hassan KaleemTulsa$137K
- Scott ColeTulsa$20K
- Supriya KoyaTulsa$7K
- Venkata VosuriTulsa$6K
- Kevin WeibelTulsa$5K
- Ali MoussaTulsa$5K
- Paul El TombTulsa$4K
- Muhammad JanjuaTulsa$4K
- Jennifer TrottmanTulsa$4K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.