Vincent Grzywacz, MD
Radiation Oncology · Charleston, SCNPI 1033603592
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 15 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 8 manufacturers reported payments, led by Novocure Inc. at 49.8% of the total. That places this record below the midpoint for radiation oncology clinicians in SC, where the typical reported total is $680.
Across 15 payments — averaging $38.29 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Novocure Inc.$286
- Siemens Medical Solutions USA, Inc.$74
- Novartis$60
- GT Medical Technologies, Inc$40
- Merck$34
- Boston Scientific$34
- plus $46 from 2 others
What the payments were for
- Food & beverage$574100%
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 |
|---|---|---|
| Novocure Inc. | 5 | $286 |
| Siemens Medical Solutions USA, Inc. | 2 | $74 |
| Novartis | 3 | $60 |
| GT Medical Technologies, Inc | 1 | $40 |
| Merck | 1 | $34 |
| Boston Scientific | 1 | $34 |
| Bioprotect Medical, Inc. | 1 | $31 |
| Tactile Systems Technology Inc | 1 | $14 |
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.
- Optune$140
How this compares
$574 in reported general payments places this provider in the 45th percentile of 72 radiation oncology 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 radiation oncology in Charleston
- Clinton MedberyCharleston$37K
- Brian LallyCharleston$29K
- David MarshallCharleston$8K
- Margaret MacdowellCharleston$1K
- Stephen RameyCharleston$1K
- Harriet Eldredge HindyCharleston$924
- Stephanie MyersCharleston$785
- Bradley DepaoliCharleston$763
- Samuel CooperCharleston$637
- Anand SharmaCharleston$563
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.