John Gnann, MD
Infectious Disease · Charleston, SCNPI 1467498659
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $33,901 of the $39,149 with a category attached, or 86.6%. 5 manufacturers reported payments, led by GSK at 48.5% of the total. Among infectious disease 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 40 payments — averaging $978.71 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GSK$19K
- Biocryst Pharmaceuticals, Inc.$15K
- Merck Kgaa$3K
- Modernatx, Inc.$2K
- Perrigo Company PLC$450
Across 1 payment — averaging $1000.00 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.
- Gilead$1K
What the payments were for
- Consulting fees$33,90187%
- Speaking & faculty fees$2,7207%
- Travel & lodging$1,9135%
- Food & beverage$6152%
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 |
|---|---|---|
| GSK | 33 | $19,004 |
| Biocryst Pharmaceuticals, Inc. | 4 | $14,550 |
| Merck Kgaa | 1 | $2,720 |
| Modernatx, Inc. | 1 | $2,425 |
| Perrigo Company PLC | 1 | $450 |
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
$39,149 in reported general payments places this provider in the 95th percentile of 102 infectious disease 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 infectious disease in Charleston
- Toby FugateCharleston$136K
- John McKinnonCharleston$85K
- Scott CurryCharleston$8K
- Kent StockCharleston$8K
- Cameron SelentCharleston$6K
- Taylor StrowmanCharleston$5K
- Eric MeissnerCharleston$4K
- Drew CharlesCharleston$2K
- Susan DormanCharleston$2K
- Joseph JohnCharleston$2K
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.