William Kemp, MD
Neurological Surgery · Madison, WINPI 1306251947
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $4,918 of the $7,878 with a category attached, or 62.4%. Alphatec Spine, Inc accounts for 60.2% of it on its own, with 7 other manufacturers making up the rest. Reporting peaked in 2023 at $5,088 and has fallen 69.6% since, to $1,548 in 2025.
Across 39 payments — averaging $202.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Alphatec Spine, Inc$5K
- Globus Medical$1K
- Medtronic$731
- Stryker$603
- Augmedics Inc.$250
- Heron Therapeutics, Inc.$109
- plus $58 from 2 others
What the payments were for
- Travel & lodging$4,91862%
- Food & beverage$2,96038%
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 |
|---|---|---|
| Alphatec Spine, Inc | 8 | $4,746 |
| Globus Medical | 7 | $1,380 |
| Medtronic | 11 | $731 |
| Stryker | 7 | $603 |
| Augmedics Inc. | 3 | $250 |
| Heron Therapeutics, Inc. | 1 | $109 |
| AbbVie | 1 | $33 |
| Orthofix Medical, Inc. | 1 | $26 |
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.
- Other - Miscellaneous$3,940
- Excelsius - GPS$1,263
- OZARK CERVICAL PLATE SYSTEM$159
- CAPRI CORPECTOMY CAGE SYSTEM$145
- N/A$145
- MAZOR X SYSTEM$128
- Invictus MIS$126
- SERRATO$113
- APONVIE$109
How this compares
$7,878 in reported general payments places this provider in the 80th percentile of 133 neurological surgery providers in Wisconsin.
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 |
|---|---|---|
| Methylprednisolone | 45 | $291 |
| Oxycodone Hcl | 19 | $219 |
| Naproxen | 34 | $217 |
| Methocarbamol | 22 | $199 |
| Gabapentin | 12 | $140 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 12 | $113 |
| Tizanidine Hcl | 17 | $109 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 15 | $49 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Madison
- Azam AhmedMadison$35K
- Mustafa BaskayaMadison$23K
- Christopher BaggottMadison$20K
- Daniel BurkettMadison$19K
- Brian SnyderMadison$9K
- Sanjay BhatiaMadison$9K
- Gregory TrostMadison$5K
- Michael KoltzMadison$5K
- Laura McGuireMadison$4K
- David NiemannMadison$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.