Derek John Feussner, M.D.
NPI 1396004479ActiveIndividual· Internal Medicine, Gastroenterology· Charleston, SC
Internal Medicine, Gastroenterology (M.D.) in Charleston, South Carolina, trained at Medical University of South Carolina College of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $1,072,943 for 1,671 claims, against $131,434 paid for services in 2024. Abbvie Inc. was the largest of 26 companies reporting payments in 2025, $2,815 in all, mostly food and beverage.
Overview
| NPI | 1396004479 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 10, 2012 |
| Last updated in NPPES | May 13, 2024 |
| Certified by provider | May 13, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | LL38558 | SC |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Gastroenterology (SC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 543 |
|---|---|
| Services billed | 1,185 across 42 procedure codes |
| Paid by Medicare | $131,434 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,671 · 3,323 30-day fills |
|---|---|
| Patients | 556 |
| Total drug cost | $1,072,943 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | Medical University of South Carolina College of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Palmetto Digestive Disease PACharleston, SC · 11 clinicians
Hospital affiliations
- Bon Secours-St Francis Xavier HospitalCharleston, SC
- Mount Pleasant HospitalMount Pleasant, SC
- Novant Health East Cooper Medical CenterMount Pleasant, SC
- Roper HospitalCharleston, SC
- Roper St Francis Hospital-Berkeley IncSummerville, SC
Industry payments (Open Payments)
- 2025$2,815 · 155 payments from 26 companies
- 2024$3,050 · 156 payments from 22 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $889.90 | 51 |
| Janssen Biotech, Inc. | $355.87 | 26 |
| Ardelyx, Inc. | $203.41 | 10 |
| Regeneron Healthcare Solutions, Inc. | $202.58 | 8 |
| Madrigal Pharmaceuticals | $198.31 | 11 |
What the 2025 payments were for
- Food and Beverage$2,815 · 155 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 63 gastroenterologists in Charleston · All gastroenterologists in South Carolina