Jan Vargas Machaj, MD
Neurological Surgery · Greenville, SCNPI 1225323488
Payments from drug & device makers
What this record shows
The money is spread across several categories — royalties or licence payments (51.8%), consulting fees and food and beverage — rather than concentrated in one kind of arrangement. 18 manufacturers reported payments, led by Viz.ai, Inc. at 54.2% of the total. Reporting peaked in 2021 at $120,535 and has fallen 90.1% since, to $11,930 in 2025. Among neurological surgery clinicians in SC 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 306 payments — averaging $677.07 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Viz.ai, Inc.$112K
- Qapel Medical Inc$25K
- Imperative Care, Inc$19K
- Siemens Medical Solutions USA, Inc.$16K
- Medtronic$10K
- Integra Lifesciences Corporation$6K
- plus $19K from 12 others
Across 66 payments — averaging $5951.98 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.
- Imperative Care, Inc$356K
- Medical Device Business Services, Inc.$21K
- Penumbra, Inc.$16K
Across 5 payments — averaging $11,291 each. An ownership or investment interest held by the physician or an immediate family member.
- Imperative Care, Inc$56K
What the payments were for
- Royalty or licence$107,30052%
- Consulting fees$65,38532%
- Speaking & faculty fees$8,8684%
- Travel & lodging$11,0645%
- Food & beverage$14,5667%
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 |
|---|---|---|
| Viz.ai, Inc. | 10 | $112,230 |
| Qapel Medical Inc | 7 | $24,993 |
| Imperative Care, Inc | 52 | $19,006 |
| Siemens Medical Solutions USA, Inc. | 46 | $16,157 |
| Medtronic(2 entities) | 92 | $9,581 |
| Integra Lifesciences Corporation | 4 | $6,217 |
| Scientia Vascular | 3 | $5,035 |
| Medical Device Business Services, Inc. | 11 | $4,753 |
| Microvention, Inc. | 16 | $4,729 |
| Penumbra, Inc. | 14 | $1,422 |
| Stryker | 16 | $898 |
| Johnson & Johnson | 24 | $846 |
| Corindus Inc. | 5 | $407 |
| Depuy Synthes Products, Inc. | 1 | $375 |
| Inspiremd Ltd | 2 | $336 |
| Rapid Medical Ltd | 1 | $148 |
| Shockwave Medical, Inc | 1 | $28 |
| Cordis US CORP. | 1 | $22 |
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.
- Viz.AI LVO$112,035
- CorPath GRX$9,465
- Pipeline$7,466
- CODMAN CERTAS$6,000
- DURASEAL EXACT$6,000
- CODMAN HAKIM PRECISION VALVE$6,000
- CUSA CLARITY$6,000
- ZOOM RDL RADIAL ACCESS SYSTEM, 103CM$4,296
- CorPath Imaging System$4,000
- EMBOGUARD$3,395
- TracStarLargeDistalPlatform$3,320
- Zoom88LargeDistalPlatform$3,320
- Zoom88_TLargeDitalPlatform$3,320
- ZoomReperfusionCatheter$3,320
- ZOOM 88-T LARGE DISTAL PLATFORM$2,420
- Penumbra System$983
- WEB$560
- STENT$554
- Embotrap$479
- ZOOM REPERFUSION CATHETER$385
How this compares
$207,184 in reported general payments places this provider in the 95th percentile of 114 neurological surgery providers in South Carolina.
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 Greenville
- James WigintonGreenville$18K
- Tyler SparksGreenville$16K
- Christie MinaGreenville$13K
- Samuel AsanteGreenville$12K
- Phillip HodgeGreenville$10K
- Sharon WebbGreenville$5K
- Earl TroupGreenville$3K
- Alejandro SpiottaCharleston$894K
- David JonesRock Hill$540K
- Sabino DagostinoLadson$425K
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.