Michael Wemhoff, MD
Neurological Surgery · Downers Grove, ILNPI 1083906838
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 96.8% of the total across 42 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. Medtronic accounts for 84.8% of it on its own, with 5 other manufacturers making up the rest. Reporting peaked in 2019 at $405 and has fallen 52.8% since, to $191 in 2024. That places this record below the midpoint for neurological surgery clinicians in IL, where the typical reported total is $2,724.
Across 42 payments — averaging $44.86 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$2K
- Zimvie Inc.$141
- DJO, LLC$49
- Centinel Spine, LLC$47
- Stryker$30
- Si-bone, Inc.$19
What the payments were for
- Travel & lodging$603%
- Food & beverage$1,82497%
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 |
|---|---|---|
| Medtronic(2 entities) | 36 | $1,598 |
| Zimvie Inc. | 1 | $141 |
| DJO, LLC | 2 | $49 |
| Centinel Spine, LLC | 1 | $47 |
| Stryker | 1 | $30 |
| Si-bone, Inc. | 1 | $19 |
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.
- CD HORIZON$428
- MAZOR X SYSTEM$175
- Mazor X Stealth Edition$165
- Mobi-C$141
How this compares
$1,884 in reported general payments places this provider in the 45th percentile of 302 neurological surgery providers in Illinois.
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 | 23 | $251 |
| Tramadol Hcl | 11 | $13 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Downers Grove
- Egon DoppenbergDowners Grove$100K
- Tyler KoskiChicago$2.3M
- Vincent TraynelisChicago$1.8M
- Sergey NeckryshChicago$1.6M
- Russell NockelsArlington Heights$1.4M
- Bruce FrankelSpringfield$1.3M
- Richard FesslerChicago$910K
- Julian BailesEvanston$666K
- John OtooleChicago$593K
- Patrick SugruePark Ridge$571K
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.