Mark Casillas, MD
Surgery · Knoxville, TNNPI 1245458082
Payments from drug & device makers
Across 129 payments — averaging $29.98 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$876
- Medtronic$569
- Johnson & Johnson$346
- La Jolla Pharmaceutical Company$254
- Takeda Pharmaceuticals U.S.A., Inc.$228
- Kerecis Limited$210
- plus $1K from 29 others
What the payments were for
- Food & beverage$3,83399%
- Education$351%
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 |
|---|---|---|
| Intuitive Surgical | 8 | $876 |
| Medtronic(2 entities) | 17 | $569 |
| Johnson & Johnson | 11 | $346 |
| La Jolla Pharmaceutical Company | 12 | $254 |
| Takeda Pharmaceuticals U.S.A., Inc. | 14 | $228 |
| Kerecis Limited | 5 | $210 |
| AbbVie(2 entities) | 7 | $153 |
| Innovation Technologies Inc | 2 | $115 |
| Mallinckrodt Enterprises LLC | 6 | $106 |
| Baxter Healthcare | 3 | $92 |
| Integra Lifesciences Corporation | 3 | $91 |
| Olympus America Inc. | 4 | $84 |
| Boston Scientific | 3 | $75 |
| Stryker | 2 | $66 |
| Acera Surgical, Inc. | 3 | $58 |
| THD America, Inc. | 2 | $51 |
| Convatec Inc. | 3 | $49 |
| Merck | 3 | $43 |
| Ambu Inc. | 2 | $41 |
| Myriad Genetic Laboratories, Inc. | 2 | $33 |
| Covidien LP | 2 | $33 |
| Shire North American Group Inc | 2 | $31 |
| Kowa Pharmaceuticals America, Inc. | 1 | $31 |
| Ferring Pharmaceuticals Inc. | 1 | $29 |
| TELA Bio, Inc. | 1 | $27 |
| Amgen | 1 | $24 |
| Axonics, Inc. | 1 | $23 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 1 | $22 |
| Vertex | 1 | $22 |
| Acell, Inc. | 1 | $18 |
| Sanara Medtech Inc. | 1 | $15 |
| Medical Device Business Services, Inc. | 1 | $15 |
| Incyte Corporation | 1 | $14 |
| Eisai Inc. | 1 | $13 |
| Cook Medical LLC | 1 | $13 |
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
$3,867 in reported general payments places this provider in the 60th percentile of 516 surgery providers in Tennessee.
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 |
|---|---|---|
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 59 | $3,849 |
| SutabSod Sulf/Pot Chloride/Mag Sulf | 15 | $2,437 |
| Metronidazole | 37 | $126 |
| Ondansetron Hcl | 60 | $99 |
| Ciprofloxacin Hcl | 27 | $59 |
Paid to pharmacies, not to this prescriber.
Other surgery in Knoxville
- Melissa PhillipsKnoxville$182K
- Michael AntipordaKnoxville$77K
- Nitin RangnekarKnoxville$35K
- Kaela BlakeKnoxville$32K
- Stephen BoyceKnoxville$30K
- Matthew ManciniKnoxville$29K
- Gregory ManciniKnoxville$29K
- Evelio RodriguezNashville$2.5M
- Heath BroussardJackson$688K
- Eric WallaceCookeville$529K
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.