John Nerva, MD
Neurological Surgery · Milwaukee, WINPI 1255652426
Payments from drug & device makers
What this record shows
8 manufacturers reported payments, led by Medtronic at 47.9% of the total. Reporting peaked in 2022 at $2,912 and has fallen 91.7% since, to $240 in 2025.
Across 105 payments — averaging $63.57 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$3K
- Globus Medical$2K
- Microvention, Inc.$842
- Balt USA, LLC$382
- Penumbra, Inc.$269
- Stryker$263
- plus $75 from 2 others
What the payments were for
- Travel & lodging$3,36350%
- Food & beverage$3,31250%
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 |
|---|---|---|
| Medtronic(2 entities) | 30 | $3,199 |
| Globus Medical | 53 | $1,644 |
| Microvention, Inc. | 8 | $842 |
| Balt USA, LLC | 3 | $382 |
| Penumbra, Inc. | 2 | $269 |
| Stryker | 5 | $263 |
| Johnson & Johnson | 3 | $51 |
| Abbott | 1 | $24 |
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.
- SOLITAIRE X$2,207
- WEB$592
- Pipeline$413
- Optima Coil System$316
- UNIVERSAL NEURO$174
- Penumbra Coil 400$170
- COALITION AGX$141
How this compares
$6,675 in reported general payments places this provider in the 75th 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.
Other neurological surgery in Milwaukee
- Amin KassamMilwaukee$1M
- Max LeeMilwaukee$456K
- Kevin WojcikMilwaukee$58K
- Saman ShabaniMilwaukee$56K
- Marjorie WangMilwaukee$52K
- Nathan ZwagermanMilwaukee$34K
- Dan HeffezMilwaukee$31K
- Kunal GuptaMilwaukee$26K
- Walter JacobsenMilwaukee$19K
- Erickson TorioMilwaukee$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.