Marshall Scott Irby, M.D.
NPI 1679560411ActiveIndividual· Internal Medicine, Pulmonary Disease· Monroe, LA
Internal Medicine, Pulmonary Disease (M.D.) in Monroe, Louisiana, licensed in LA, with an NPI issued in October 2005. Their prescriptions cost Medicare Part D more than their services did: $989,903 for 1,808 claims, against $82,775 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 8 companies reporting payments in 2025, $606.84 in all, mostly food and beverage. Lists Fmol Health St Francis and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1679560411 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 5, 2005 |
| Last updated in NPPES | Jan 16, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | 08027R | LA |
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 (LA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 426 |
|---|---|
| Services billed | 1,260 across 6 procedure codes |
| Paid by Medicare | $82,775 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,808 · 2,556 30-day fills |
|---|---|
| Patients | 287 |
| Total drug cost | $989,903 |
| Generic share | 43% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pulmonary Disease |
Hospital affiliations
- Fmol Health St FrancisMonroe, LA
- Franklin Medical CenterWinnsboro, LA
- Monroe Surgical HospitalMonroe, LA
- Richardson Medical CenterRayville, LA
- West Carroll Memorial HospitalOak Grove, LA
Industry payments (Open Payments)
- 2025$606.84 · 29 payments from 8 companies
- 2024$576.26 · 26 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $135.85 | 7 |
| Astrazeneca Pharmaceuticals LP | $128.48 | 6 |
| Verona Pharma, Inc. | $115.42 | 5 |
| Viatris Specialty LLC | $77.85 | 4 |
| Grifols USA, LLC | $69.67 | 3 |
What the 2025 payments were for
- Food and Beverage$606.84 · 29 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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