Luis A. Armstrong, M.D.
NPI 1952411670ActiveIndividual· Internal Medicine, Gastroenterology· Casper, WY
Internal Medicine, Gastroenterology (M.D.) in Casper, Wyoming, trained at Ponce School of Medicine (class of 2000). Their prescriptions cost Medicare Part D more than their services did: $806,371 for 1,178 claims, against $59,979 paid for services in 2024. Janssen Biotech, Inc. was the largest of 9 companies reporting payments in 2025, $388.11 in all, mostly food and beverage.
Overview
| NPI | 1952411670 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 30, 2006 |
| Last updated in NPPES | Nov 8, 2024 |
| Certified by provider | Nov 8, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | M3867 | 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); Practitioner - Gastroenterology (WY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 271 |
|---|---|
| Services billed | 582 across 49 procedure codes |
| Paid by Medicare | $59,979 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,178 · 2,453 30-day fills |
|---|---|
| Patients | 393 |
| Total drug cost | $806,371 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | Ponce School of Medicine |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Gastroenterology |
Medical group
- Digestive Care Specialists, LLCCasper, WY · 8 clinicians
Hospital affiliations
- Banner Wyoming Medical CenterCasper, WY
- Campbell County HealthGillette, WY
- Memorial Hospital of Converse CountyDouglas, WY
- Sagewest Health CareRiverton, WY
- Summit Medical CenterCasper, WY
Industry payments (Open Payments)
- 2025$388.11 · 16 payments from 9 companies
- 2024$376.65 · 17 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $111.60 | 5 |
| Takeda Pharmaceuticals U.S.A., Inc. | $63.15 | 3 |
| Fujifilm Healthcare Americas Corporation | $56.88 | 1 |
| Phathom Pharmaceuticals, Inc. | $43.75 | 1 |
| Abbvie Inc. | $42.00 | 2 |
What the 2025 payments were for
- Food and Beverage$388.11 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Gastroenterology providers in Wyoming →