Mahan Ghiassi, MD
Neurological Surgery · Louisville, KYNPI 1285827725
Payments from drug & device makers
What this record shows
The money is spread across several categories — food and beverage (57.6%), consulting fees and travel and lodging — rather than concentrated in one kind of arrangement. 14 manufacturers reported payments, led by Medical Device Business Services, Inc. at 33.0% of the total. Reporting peaked in 2019 at $7,021 and has fallen 87.8% since, to $856 in 2025.
Across 199 payments — averaging $57.50 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medical Device Business Services, Inc.$4K
- Medtronic$3K
- Stryker$2K
- Microvention, Inc.$845
- Johnson & Johnson$492
- Penumbra, Inc.$246
- plus $510 from 8 others
Across 21 payments — averaging $740.71 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.
- Penumbra, Inc.$16K
What the payments were for
- Consulting fees$3,60031%
- Travel & lodging$1,23211%
- Food & beverage$6,59058%
- Education$200%
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 |
|---|---|---|
| Medical Device Business Services, Inc. | 6 | $3,777 |
| Medtronic(2 entities) | 89 | $3,081 |
| Stryker | 40 | $2,490 |
| Microvention, Inc. | 29 | $845 |
| Johnson & Johnson | 15 | $492 |
| Penumbra, Inc. | 4 | $246 |
| Terumo Medical Corporation | 8 | $178 |
| Scientia Vascular | 1 | $165 |
| Silk Road Medical, Inc. | 1 | $40 |
| CSL Behring | 2 | $40 |
| Integra Lifesciences Corporation | 1 | $29 |
| Portola Pharmaceuticals, LLC | 1 | $22 |
| Teleflex LLC | 1 | $18 |
| Asahi Intecc USA, Inc. | 1 | $18 |
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
$11,442 in reported general payments places this provider in the 70th percentile of 99 neurological surgery providers in Kentucky.
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 |
|---|---|---|
| ClopidogrelClopidogrel Bisulfate | 29 | $160 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Louisville
- Tom YaoLouisville$405K
- Joseph NeimatLouisville$196K
- Maria KoutourousiouLouisville$189K
- Shervin DashtiLouisville$146K
- Shawn AdamsLouisville$73K
- Nathaniel ToopLouisville$56K
- Thomas AltstadtLouisville$36K
- Brian WilliamsLouisville$33K
- Ajmal ZemmarLouisville$32K
- Redi RahmaniLouisville$29K
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.