Mark W. Greenwell, M.D.
NPI 1184681371ActiveIndividual· Internal Medicine, Nephrology· Paris, TX
Internal Medicine, Nephrology (M.D.) in Paris, Texas, trained at University of Texas Medical School at Houston (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $834,066 for 2,807 claims, against $194,372 paid for services in 2024. Novartis Pharmaceuticals Corporation reported $24.52 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1184681371 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 1, 2006 |
| Last updated in NPPES | Apr 20, 2023 |
| Certified by provider | Apr 20, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | P3725 | TX |
| Internal Medicine, Nephrology | 207RN0300X | 29498 | OK |
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 - Nephrology (OK); Practitioner - Nephrology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 622 |
|---|---|
| Services billed | 2,294 across 20 procedure codes |
| Paid by Medicare | $194,372 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,807 · 5,369 30-day fills |
|---|---|
| Patients | 460 |
| Total drug cost | $834,066 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at Houston |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Tyler Nephrology Associates PATyler, TX · 27 clinicians
Hospital affiliations
- Christus Mother Frances HospitalTyler, TX
- Christus Mother Frances Hospital Sulphur SpringsSulphur Springs, TX
- McCurtain Memorial HospitalIdabel, OK
- Paris Regional Medical CenterParis, TX
- Titus Regional Medical CenterMount Pleasant, TX
Other facilities
- Davita Idabel DialysisDialysis facility · Idabel, OK
- Rcg ParisDialysis facility · Paris, TX
- Zz_closed_fmcna - Idabel DxDialysis facility · Idabel, OK
- Paris Regional Medical CenterInpatient rehabilitation facility · Paris, TX
Industry payments (Open Payments)
- 2025$24.52 · 1 payment from 1 company
- 2024$23.12 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $24.52 | 1 |
What the 2025 payments were for
- Food and Beverage$24.52 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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