Gregory Charles Zwack, MD
NPI 1104857358ActiveIndividual· Otolaryngology· Wilmington, NC
Otolaryngology (MD) in Wilmington, North Carolina, trained at Jefferson Medical College of Thomas Jefferson University (class of 1992). In 2024 Medicare paid $130,625 for 656 patients, and Part D covered 497 of their prescriptions, 89% of them generic. Aerin Medical Inc. was the largest of 4 companies reporting payments in 2025, $272.02 in all, mostly food and beverage.
Overview
| NPI | 1104857358 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 6, 2006 |
| Last updated in NPPES | Jan 31, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Otolaryngology Primary | 207Y00000X | 2009-01440 | NC |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Otolaryngology (NC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 656 |
|---|---|
| Services billed | 1,910 across 77 procedure codes |
| Paid by Medicare | $130,625 |
Part D prescriptions in 2024
| Prescriptions (claims) | 497 · 675 30-day fills |
|---|---|
| Patients | 199 |
| Total drug cost | $115,517 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Otolaryngology |
Medical group
- Wilmington Health PLLCWilmington, NC · 369 clinicians
Hospital affiliation
- Novant Health New Hanover Regional Medical CenterWilmington, NC
Industry payments (Open Payments)
- 2025$272.02 · 11 payments from 4 companies
- 2024$571.12 · 19 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aerin Medical Inc. | $117.19 | 4 |
| Glaxosmithkline, LLC. | $68.19 | 4 |
| Genzyme Corporation | $58.51 | 2 |
| Stryker Corporation | $28.13 | 1 |
What the 2025 payments were for
- Food and Beverage$272.02 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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