Gregory Willis, DO
Gynecologic Oncology · York, PANPI 1184605677
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $925 of the $1,046 with a category attached, or 88.5%. 8 manufacturers reported payments, led by GSK at 31.5% of the total. Reporting peaked in 2019 at $423 and has fallen 74.7% since, to $107 in 2025. That places this record below the midpoint for gynecologic oncology clinicians in PA, where the typical reported total is $1,148.
Across 15 payments — averaging $69.71 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GSK$329
- Tesaro, Inc.$212
- Clovis Oncology, Inc.$143
- Eisai Inc.$129
- Merck$101
- AstraZeneca$77
- plus $56 from 2 others
What the payments were for
- Food & beverage$92588%
- Education$12112%
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 |
|---|---|---|
| GSK | 3 | $329 |
| Tesaro, Inc. | 2 | $212 |
| Clovis Oncology, Inc. | 4 | $143 |
| Eisai Inc. | 2 | $129 |
| Merck | 1 | $101 |
| AstraZeneca | 1 | $77 |
| Baxter Healthcare | 1 | $36 |
| Myriad Genetic Laboratories, Inc. | 1 | $20 |
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.
How this compares
$1,046 in reported general payments places this provider in the 45th percentile of 90 gynecologic oncology providers in Pennsylvania.
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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| EliquisApixaban | 18 | $18,641 |
| Ondansetron Hcl | 11 | $1,733 |
| Prochlorperazine Maleate | 20 | $436 |
| Dexamethasone | 19 | $360 |
| Letrozole | 19 | $357 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 33 | $197 |
| Estradiol | 12 | $52 |
Paid to pharmacies, not to this prescriber.
Other gynecologic oncology in York
- Ali MahdaviYork$4K
- Eav LimYork$4K
- Thomas KrivakPittsburgh$1.6M
- Mark ShahinHershey$914K
- Joshua KestersonNewport$839K
- Charles DuntonWynnewood$309K
- M ThomasAllentown$257K
- Alexander OlawaiyePittsburgh$226K
- John NakayamaPittsburgh$194K
- Emily KoPhiladelphia$78K
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.