Gregory Zwack, MD
Otolaryngology · Wilmington, NCNPI 1104857358
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $2,607 of the $3,538 with a category attached, or 73.7%. 23 manufacturers reported payments, led by Medtronic at 35.1% of the total. Reporting peaked in 2022 at $1,420 and has fallen 80.8% since, to $272 in 2025.
Across 98 payments — averaging $36.10 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$1K
- GSK$523
- Sanofi$404
- Intersect ENT, Inc.$384
- Aerin Medical Inc.$223
- Regeneron Healthcare Solutions, Inc.$158
- plus $602 from 17 others
What the payments were for
- Travel & lodging$88125%
- Food & beverage$2,60774%
- Education$501%
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 |
|---|---|---|
| Medtronic(2 entities) | 19 | $1,244 |
| GSK | 20 | $523 |
| Sanofi | 14 | $404 |
| Intersect ENT, Inc. | 5 | $384 |
| Aerin Medical Inc. | 7 | $223 |
| Regeneron Healthcare Solutions, Inc. | 5 | $158 |
| Optinose US, Inc. | 6 | $123 |
| Advanced Bionics, LLC | 1 | $94 |
| Smith+Nephew | 1 | $50 |
| Amgen | 3 | $49 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 3 | $45 |
| Novo Nordisk | 2 | $30 |
| Grifols USA, LLC | 2 | $30 |
| Stryker | 1 | $28 |
| Inspire Medical Systems, Inc. | 1 | $26 |
| Phathom Pharmaceuticals, Inc. | 1 | $20 |
| Acclarent, Inc | 1 | $20 |
| Phadia US Inc. | 1 | $17 |
| Boston Scientific | 1 | $16 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $15 |
| Kowa Pharmaceuticals America, Inc. | 1 | $14 |
| AbbVie | 1 | $13 |
| Arbor Pharmaceuticals, Inc. | 1 | $12 |
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.
- STEALTHSTATION S8 PLATFORM$807
- NUCALA$243
- SINUVA$234
How this compares
$3,538 in reported general payments places this provider in the 80th percentile of 362 otolaryngology providers in North 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Dupixent PenDupilumab | 14 | $50,505 |
| Ipratropium Bromide | 102 | $3,033 |
| Ciprofloxacin-DexamethasoneCiprofloxacin Hcl/Dexameth | 23 | $2,705 |
| Montelukast Sodium | 84 | $640 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 37 | $383 |
| Esomeprazole Magnesium | 11 | $164 |
| Prednisone | 41 | $152 |
| Doxycycline Hyclate | 13 | $126 |
| Mupirocin | 16 | $125 |
| Levothyroxine Sodium | 11 | $91 |
| Fluticasone Propionate | 13 | $77 |
| Meclizine Hcl | 15 | $68 |
Paid to pharmacies, not to this prescriber.
Other otolaryngology in Wilmington
- Stuart HardyWilmington$5K
- S VonbibersteinWilmington$5K
- John RocheWilmington$4K
- David JangDurham$324K
- Robert FerrisRaleigh$258K
- Adam ZanationHickory$227K
- Brent SeniorChapel Hill$91K
- Charles EbertChapel Hill$57K
- Adam CampbellWinston Salem$47K
- Harold PillsburyChapel Hill$42K
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.