Eugene Koay
Radiation Oncology · Houston, TXNPI 1699011924
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $24,908 of the $25,448 with a category attached, or 97.9%. AstraZeneca accounts for 98.2% of it on its own, with 6 other manufacturers making up the rest. Reporting peaked in 2022 at $19,958 and has fallen 99.0% since, to $204 in 2025. Among radiation oncology clinicians in TX with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 18 payments — averaging $1413.76 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$25K
- Histosonics, Inc.$210
- Jazz Pharmaceuticals Inc.$97
- Merck$75
- Medtronic$35
- Janssen Research & Development, LLC$31
- plus $21 from 1 others
Across 3 payments — averaging $75,483 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.
- EMD Serono, Inc.$198K
- Boston Scientific$28K
What the payments were for
- Consulting fees$24,90898%
- Travel & lodging$2041%
- Food & beverage$3361%
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 |
|---|---|---|
| AstraZeneca | 8 | $24,978 |
| Histosonics, Inc. | 3 | $210 |
| Jazz Pharmaceuticals Inc. | 1 | $97 |
| Merck | 3 | $75 |
| Medtronic | 1 | $35 |
| Janssen Research & Development, LLC | 1 | $31 |
| Viewray Technologies Inc | 1 | $21 |
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.
- IMFINZI$4,908
How this compares
$25,448 in reported general payments places this provider in the 90th percentile of 418 radiation oncology providers in Texas.
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 radiation oncology in Houston
- James WelshHouston$421K
- Stephen ChunHouston$344K
- Chad TangHouston$183K
- Phuoc TranHouston$177K
- Steven LinHouston$105K
- Benjamin SchrankHouston$100K
- Abhilasha PatelHouston$76K
- Joe ChangHouston$50K
- Daniel GomezHouston$47K
- David RosenthalHouston$40K
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.