Gregory Brennan, M.D.
NPI 1689017105ActiveIndividual· Internal Medicine, Gastroenterology· Mansfield, TX
Internal Medicine, Gastroenterology (M.D.) in Mansfield, Texas, trained at Tufts University School of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $441,622 for 1,083 claims, against $119,326 paid for services in 2024. Abbvie Inc. was the largest of 21 companies reporting payments in 2025, $1,384 in all, mostly food and beverage.
Overview
| NPI | 1689017105 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 15, 2013 |
| Last updated in NPPES | Aug 25, 2021 |
| Certified by provider | Aug 25, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | Q4044 | TX |
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 (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 314 |
|---|---|
| Services billed | 3,737 across 48 procedure codes |
| Paid by Medicare | $119,326 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,083 · 1,850 30-day fills |
|---|---|
| Patients | 429 |
| Total drug cost | $441,622 |
| Generic share | 73% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Gastroenterology |
Medical group
- Texas Digestive Disease Consultants, PLLCFlower Mound, TX · 608 clinicians
Hospital affiliation
- Texas Health Hospital MansfieldMansfield, TX
Industry payments (Open Payments)
- 2025$1,384 · 78 payments from 21 companies
- 2024$1,721 · 89 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $429.21 | 29 |
| Janssen Biotech, Inc. | $163.73 | 9 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $100.38 | 5 |
| Madrigal Pharmaceuticals | $96.79 | 5 |
| Pfizer Inc. | $92.16 | 5 |
What the 2025 payments were for
- Food and Beverage$1,384 · 78 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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