Zachary Castor, PA
Physician Assistant · Wichita, KSNPI 1760882112
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (36.8%), food and beverage and travel and lodging — rather than concentrated in one kind of arrangement. Merck accounts for 69.4% of it on its own, with 26 other manufacturers making up the rest. 2025 is the largest year on record at $4,944, 6.3 times the $790 reported in 2021. Among physician assistant clinicians in KS 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 126 payments — averaging $54.30 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$5K
- Johnson & Johnson$424
- Astellas Pharma US Inc$343
- Dendreon Pharmaceuticals LLC$168
- Tolmar Pharmaceuticals, Inc.$129
- Pfizer$124
- plus $906 from 21 others
What the payments were for
- Speaking & faculty fees$2,52037%
- Travel & lodging$1,83327%
- Food & beverage$2,29934%
- Education$1903%
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 | 21 | $4,748 |
| Johnson & Johnson | 18 | $424 |
| Astellas Pharma US Inc | 21 | $343 |
| Dendreon Pharmaceuticals LLC | 7 | $168 |
| Tolmar Pharmaceuticals, Inc. | 9 | $129 |
| Pfizer | 7 | $124 |
| Blue Earth Diagnostics | 6 | $107 |
| Sumitomo Pharma America, Inc. | 6 | $107 |
| Axonics, Inc. | 2 | $80 |
| Boston Scientific | 2 | $79 |
| Urogen Pharma, Inc. | 3 | $78 |
| Progenics Pharmaceuticals, Inc. | 3 | $64 |
| Vertex | 2 | $59 |
| Coloplast | 3 | $41 |
| Ferring Pharmaceuticals Inc. | 2 | $41 |
| Alnylam Pharmaceuticals Inc. | 2 | $39 |
| Teleflex LLC | 2 | $37 |
| Calyxo, Inc. | 1 | $26 |
| Travere Therapeutics, Inc. | 1 | $21 |
| AstraZeneca | 1 | $21 |
| Accord Healthcare, Inc. | 1 | $20 |
| Verity Pharmaceuticals Inc. | 1 | $16 |
| Urovant Sciences Inc | 1 | $16 |
| AbbVie | 1 | $15 |
| Endo Pharmaceuticals Inc. | 1 | $13 |
| Amgen | 1 | $13 |
| Antares Pharma, Inc. | 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.
How this compares
$6,842 in reported general payments places this provider in the 90th percentile of 1,016 physician assistant providers in Kansas.
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 |
|---|---|---|
| MyrbetriqMirabegron | 96 | $46,056 |
| GemtesaVibegron | 54 | $37,984 |
| Potassium Citrate ErPotassium Citrate | 184 | $10,052 |
| Methenamine Hippurate | 42 | $2,711 |
| Tamsulosin Hcl | 221 | $2,193 |
| Solifenacin Succinate | 29 | $2,034 |
| Testosterone Cypionate | 57 | $1,725 |
| Testosterone | 22 | $1,329 |
| Cephalexin | 73 | $1,046 |
| Estradiol | 12 | $891 |
| Alfuzosin Hcl ErAlfuzosin Hcl | 68 | $856 |
| Chlorthalidone | 154 | $852 |
| Trimethoprim | 16 | $793 |
| Allopurinol | 87 | $694 |
| Klor-Con M15Potassium Chloride | 11 | $544 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Astellas Pharma US IncMyrbetriq | $343 | $46,05696 claims |
| Sumitomo Pharma America, Inc.Gemtesa | $107 | $37,98454 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 90th percentile of 1,016 physician assistant providers in Kansas.
Other physician assistant in Wichita
- Sierra FergusonWichita$25K
- Ashton YoungersWichita$14K
- Therese SchrandtWichita$13K
- Mike HallWichita$13K
- Jenny MartensWichita$13K
- Shanna SudermanWichita$13K
- Megan HolickWichita$12K
- Colleen YoungWichita$11K
- Kathleen Dang-PhamWichita$11K
- Trinh HoangWichita$11K
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.