Kostadinos Antonopoulos
Foot & Ankle Surgery · Sioux City, IANPI 1043521644
Payments from drug & device makers
What this record shows
The money is spread across several categories — education (55.0%), travel and lodging and speaking fees — rather than concentrated in one kind of arrangement. 13 manufacturers reported payments, led by Arthrex at 32.9% of the total. Reporting peaked in 2021 at $5,026 and has fallen 69.4% since, to $1,535 in 2025.
Across 37 payments — averaging $228.31 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Arthrex$3K
- Conetic Solutions, Inc.$2K
- Biopoly LLC$2K
- RSW Medical Company, Inc.$1K
- Nvision Biomedical Technologies, Inc.$687
- Smith+Nephew$82
- plus $132 from 7 others
What the payments were for
- Speaking & faculty fees$1,50018%
- Travel & lodging$1,52218%
- Food & beverage$7779%
- Education$4,64955%
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 |
|---|---|---|
| Arthrex | 9 | $2,782 |
| Conetic Solutions, Inc. | 10 | $2,216 |
| Biopoly LLC | 1 | $1,500 |
| RSW Medical Company, Inc. | 2 | $1,049 |
| Nvision Biomedical Technologies, Inc. | 1 | $687 |
| Smith+Nephew | 5 | $82 |
| Musculoskeletal Transplant Foundation Inc. | 1 | $39 |
| Orthofix Medical, Inc. | 3 | $23 |
| Stryker | 1 | $22 |
| Osiris Therapeutics Inc. | 1 | $14 |
| Pfizer | 1 | $12 |
| Biocomposites Inc | 1 | $12 |
| Merck | 1 | $11 |
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.
- BioPoly Great Toe Hemiarthroplasty Implant$7,500
- Training Lab$687
How this compares
$8,448 in reported general payments places this provider in the 70th percentile of 112 foot & ankle surgery providers in Iowa.
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 |
|---|---|---|
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 103 | $1,106 |
| Meloxicam | 204 | $460 |
| Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav | 20 | $330 |
| Cephalexin | 32 | $141 |
| Methylprednisolone | 28 | $129 |
| Levofloxacin | 17 | $70 |
Paid to pharmacies, not to this prescriber.
Other foot & ankle surgery in Sioux City
- Phinit PhisitkulSioux City$1.4M
- Valerie Tallerico-AntonopoulosSioux City$9K
- Kham UngSioux City$4K
- Michael LeeDes Moines$2.1M
- Sean GrambartDes Moines$590K
- Kelsey MillonigDes Moines$330K
- Charles CibulaCedar Falls$38K
- Gregory FooteWaterloo$35K
- Nathan ShumwayCouncil Bluffs$33K
- Justin RaatzDes Moines$28K
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.