Thomas Walter Abernathy Jr., M.D.
NPI 1538105697ActiveIndividual· Internal Medicine, Gastroenterology· Catonsville, MD
Internal Medicine, Gastroenterology (M.D.) in Catonsville, Maryland, trained at Drexel University College of Medicine (class of 1999). In 2024 Medicare paid $142,673 for 384 patients, and Part D covered 588 of their prescriptions, 80% of them generic. Janssen Biotech, Inc. was the largest of 17 companies reporting payments in 2025, $1,481 in all, mostly food and beverage.
Overview
| NPI | 1538105697 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 20, 2006 |
| Last updated in NPPES | Aug 8, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | D0061137 | MD |
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 (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 384 |
|---|---|
| Services billed | 4,320 across 45 procedure codes |
| Paid by Medicare | $142,673 |
Part D prescriptions in 2024
| Prescriptions (claims) | 588 · 872 30-day fills |
|---|---|
| Patients | 238 |
| Total drug cost | $120,806 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | Drexel University College of Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Chesapeake Digestive Associates, PCColumbia, MD · 38 clinicians
Hospital affiliation
- Saint Agnes HospitalBaltimore, MD
Industry payments (Open Payments)
- 2025$1,481 · 63 payments from 17 companies
- 2024$1,576 · 71 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $316.93 | 10 |
| Takeda Pharmaceuticals U.S.A., Inc. | $244.71 | 10 |
| Abbvie Inc. | $197.13 | 10 |
| Genzyme Corporation | $154.16 | 6 |
| Pfizer Inc. | $95.33 | 5 |
What the 2025 payments were for
- Food and Beverage$1,387 · 61 payments
- Education$93.24 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 gastroenterologists in Catonsville · All gastroenterologists in Maryland