David Sun, MD
Neurological Surgery · Louisville, KYNPI 1376690164
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $9,250 of the $13,110 with a category attached, or 70.6%. Monteris Medical Corporation accounts for 82.9% of it on its own, with 14 other manufacturers making up the rest. Reporting peaked in 2022 at $3,674 and has fallen 98.7% since, to $49 in 2025.
Across 51 payments — averaging $257.06 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Monteris Medical Corporation$11K
- DIXI Medical USA Corp$729
- GE HealthCare$551
- Stryker$497
- GT Medical Technologies, Inc$100
- NICO Corporation$92
- plus $279 from 9 others
Across 63 payments — averaging $3250.04 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.
- Monteris Medical Corporation$205K
What the payments were for
- Consulting fees$9,25071%
- Travel & lodging$1,32710%
- Food & beverage$2,51319%
- Education$200%
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 |
|---|---|---|
| Monteris Medical Corporation | 26 | $10,863 |
| DIXI Medical USA Corp | 1 | $729 |
| GE HealthCare | 4 | $551 |
| Stryker | 2 | $497 |
| GT Medical Technologies, Inc | 4 | $100 |
| NICO Corporation | 1 | $92 |
| CSL Behring | 4 | $78 |
| Portola Pharmaceuticals, LLC | 2 | $54 |
| Neuropace, Inc. | 1 | $49 |
| Johnson & Johnson | 1 | $25 |
| Servier Pharmaceuticals LLC | 1 | $21 |
| Baxter Healthcare | 1 | $15 |
| Arkis Biosciences Inc | 1 | $14 |
| Boston Scientific | 1 | $11 |
| Medtronic | 1 | $11 |
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.
- Neuroblate$10,258
- MAKO$469
How this compares
$13,110 in reported general payments places this provider in the 75th 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 |
|---|---|---|
| Dexamethasone | 20 | $181 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 36 | $136 |
| Mupirocin | 13 | $65 |
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.