Marilyn M. Landrum, MD
NPI 1285683987ActiveIndividual· Internal Medicine· Denison, TX
Internal Medicine (MD) in Denison, Texas, trained at Sanford School of Medicine of University of South Dakota (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $949,437 for 9,337 claims, against $200,103 paid for services in 2024. Amgen Inc. was the largest of 9 companies reporting payments in 2025, $380.39 in all, mostly food and beverage.
Overview
| NPI | 1285683987 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 9, 2006 |
| Last updated in NPPES | Jan 26, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | L0363 | TX |
| Pediatrics | 208000000X | L0363 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 322 |
|---|---|
| Services billed | 6,167 across 106 procedure codes |
| Paid by Medicare | $200,103 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,337 · 20,723 30-day fills |
|---|---|
| Patients | 522 |
| Total drug cost | $949,437 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Sanford School of Medicine of University of South Dakota |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Legacy Healthcare Services IncGreenville, SC · 3,223 clinicians
- TexomacareDurant, OK · 47 clinicians
Hospital affiliations
- Alliancehealth DurantDurant, OK
- Texoma Medical CenterDenison, TX
Other facilities
- Choice Health at Home - AntlersHome health agency · Durant, OK
- Tmc Home Health of DurantHome health agency · Durant, OK
Industry payments (Open Payments)
- 2025$380.39 · 22 payments from 9 companies
- 2024$462.65 · 27 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $105.37 | 6 |
| Astellas Pharma US Inc | $66.52 | 4 |
| Pfizer Inc. | $66.16 | 4 |
| Novo Nordisk Inc | $39.40 | 2 |
| Astrazeneca Pharmaceuticals LP | $32.69 | 2 |
What the 2025 payments were for
- Food and Beverage$380.39 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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