Gregory K. Sewall, MD
NPI 1336195023ActiveIndividual· Otolaryngology· Wausau, WI
Otolaryngology (MD) in Wausau, Wisconsin, trained at Medical College of Wisconsin (class of 1999). 191 Medicare patients in 2024, $35,357 paid; nearly all of their 114 Part D prescriptions were generic (98%). Medtronic, Inc. was the largest of 3 companies reporting payments in 2025, $84.55 in all, mostly food and beverage.
Overview
| NPI | 1336195023 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 25, 2006 |
| Last updated in NPPES | Apr 13, 2020 |
| Certified by provider | Apr 13, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Otolaryngology Primary | 207Y00000X | 42332-020 | WI |
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 (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 191 |
|---|---|
| Services billed | 354 across 45 procedure codes |
| Paid by Medicare | $35,357 |
Part D prescriptions in 2024
| Prescriptions (claims) | 114 · 114 30-day fills |
|---|---|
| Patients | 63 |
| Total drug cost | $1,552 |
| Generic share | 98% of claims |
Education and affiliations
| Medical school | Medical College of Wisconsin |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Otolaryngology |
Medical groups
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.Rhinelander, WI · 574 clinicians
- ENT and Allergy Associates SCWausau, WI · 25 clinicians
Hospital affiliations
- Aspirus Medford Hospital & Clinics, IncMedford, WI
- Aspirus Wausau HospitalWausau, WI
- Howard Young Medical CenterWoodruff, WI
Industry payments (Open Payments)
- 2025$84.55 · 4 payments from 3 companies
- 2024$74.35 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $34.73 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $27.79 | 1 |
| Regeneron Healthcare Solutions, Inc. | $22.03 | 1 |
What the 2025 payments were for
- Food and Beverage$84.55 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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