George Katsamakis, MD
Neurology · Lake Barrington, ILNPI 1174502835
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (47.8%), consulting fees and food and beverage — rather than concentrated in one kind of arrangement. It is spread thinly across 48 manufacturers, the largest accounting for just 22.6%. Reporting peaked in 2019 at $70,056 and has fallen 58.5% since, to $29,088 in 2025. Among neurology clinicians in IL with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 658 payments — averaging $288.65 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Biogen$43K
- Sanofi$28K
- Genentech USA, Inc.$27K
- EMD Serono, Inc.$26K
- TG Therapeutics, Inc.$25K
- Ares Trading SA$23K
- plus $18K from 42 others
Across 99 payments — averaging $2123.34 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Biogen$94K
- EMD Serono, Inc.$72K
- Jazz Pharmaceuticals Inc.$17K
- Bristol Myers Squibb$15K
- AstraZeneca$12K
- Ares Trading SA$765
What the payments were for
- Consulting fees$68,90936%
- Speaking & faculty fees$90,74948%
- Travel & lodging$13,2297%
- Food & beverage$16,8789%
- Education$1700%
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.
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.
How this compares
$189,934 in reported general payments places this provider in the 95th percentile of 790 neurology 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 |
|---|---|---|
| Kesimpta PenOfatumumab | 56 | $522,390 |
| TecfideraDimethyl Fumarate | 34 | $310,576 |
| MayzentSiponimod | 13 | $122,142 |
| Avonex Pen (4 Pack)Interferon Beta-1a | 13 | $107,514 |
| Dalfampridine ErDalfampridine | 224 | $89,440 |
| Teriflunomide | 37 | $78,720 |
| GlatopaGlatiramer Acetate | 11 | $29,786 |
| MyrbetriqMirabegron | 36 | $22,166 |
| Baclofen | 280 | $7,917 |
| Gabapentin | 255 | $7,726 |
| Lacosamide | 22 | $6,905 |
| XareltoRivaroxaban | 13 | $6,873 |
| NeurontinGabapentin | 12 | $5,684 |
| Dimethyl Fumarate | 22 | $3,441 |
| Lisdexamfetamine Dimesylate | 14 | $3,041 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| BiogenTecfidera | $42,889 | $310,57634 claims |
| NovartisMayzent | $6,269 | $122,14213 claims |
| Johnson & JohnsonXarelto | $45 | $6,87313 claims |
| Upsher-smith Laboratories LLCTopiramate | $20 | $48757 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 95th percentile of 790 neurology providers in Illinois.
Other neurology in Lake Barrington
- Andrew GordonLake Barrington$765K
- Daniele AndersonLake Barrington$191K
- Augusto MiravalleChicago$1.4M
- Lori GuytonHerrin$1.1M
- Daniel WynnNorthbrook$812K
- Arthur ItkinPalos Heights$808K
- Martha McGrawWinfield$625K
- Reuben ValenzuelaPeoria$590K
- Adil JavedChicago$584K
- Tyler KaplanMaywood$549K
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.