Mark J. Corso, M.D.
NPI 1578635090ActiveIndividual· Specialist· Newark, DE
Specialist (M.D.) in Newark, Delaware, trained at Hahnemann University College of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $435,497 for 1,240 claims, against $245,851 paid for services in 2024. Janssen Biotech, Inc. was the largest of 9 companies reporting payments in 2025, $312.96 in all, mostly food and beverage.
Overview
| NPI | 1578635090 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 14, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | C1-0006956 | DE |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (DE) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 822 |
|---|---|
| Services billed | 6,496 across 48 procedure codes |
| Paid by Medicare | $245,851 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,240 · 3,282 30-day fills |
|---|---|
| Patients | 359 |
| Total drug cost | $435,497 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Hahnemann University College of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Christiana Care Health Services IncNewark, DE · 1,483 clinicians
- Delaware Center for Digestive Care LLCNewark, DE · 66 clinicians
Hospital affiliations
- Christiana HospitalNewark, DE
- Union Hospital of Cecil CountyElkton, MD
Industry payments (Open Payments)
- 2025$312.96 · 16 payments from 9 companies
- 2024$645.39 · 27 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $56.42 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $50.83 | 2 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $43.36 | 2 |
| Abbvie Inc. | $36.52 | 2 |
| Phathom Pharmaceuticals, Inc. | $31.45 | 3 |
What the 2025 payments were for
- Food and Beverage$312.96 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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