Hendrik Klopper, MD
Neurological Surgery · Dakota Dunes, SDNPI 1942429394
Payments from drug & device makers
What this record shows
6 manufacturers reported payments, led by Stryker at 58.8% of the total. Reporting peaked in 2023 at $2,442 and has fallen 88.5% since, to $280 in 2025.
Across 30 payments — averaging $131.84 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Stryker$2K
- Medtronic$929
- Si-bone, Inc.$328
- Histosonics, Inc.$171
- Kuros Biosciences USA, Inc$110
- Arthrex$90
What the payments were for
- Travel & lodging$2,17755%
- Food & beverage$1,77845%
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 |
|---|---|---|
| Stryker | 15 | $2,327 |
| Medtronic(2 entities) | 8 | $929 |
| Si-bone, Inc. | 4 | $328 |
| Histosonics, Inc. | 1 | $171 |
| Kuros Biosciences USA, Inc | 1 | $110 |
| Arthrex | 1 | $90 |
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.
- EVEREST SPINAL SYSTEM$1,907
- MAZOR X SYSTEM$333
- iFuse Implant$262
- UNID_PASS$175
- CD HORIZON SPINAL SYSTEM$159
- AIRO$150
- MagnetOs$110
How this compares
$3,955 in reported general payments places this provider in the 70th percentile of 20 neurological surgery providers in South Dakota.
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 |
|---|---|---|
| Gabapentin | 31 | $481 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 23 | $188 |
| Levetiracetam | 22 | $175 |
| Tramadol Hcl | 16 | $62 |
| Cyclobenzaprine Hcl | 12 | $40 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Dakota Dunes
- Luis Diaz-AguilarDakota Dunes$5K
- Quentin DurwardDakota Dunes$3K
- Matthew JohnsonDakota Dunes$1K
- Grant ShumakerDakota Dunes$516
- Ralph ReederDakota Dunes$272
- Thorir RagnarssonDakota Dunes$50
- Jonathan WilsonRapid City$153K
- Shawn VuongSioux Falls$39K
- George YangSioux Falls$7K
- Seokchun LimSioux Falls$4K
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.