John S. Smiarowski, M.D.
NPI 1568462851ActiveIndividual· Internal Medicine, Gastroenterology· Monroe, LA
Internal Medicine, Gastroenterology (M.D.) in Monroe, Louisiana, trained at Yale University School of Medicine (class of 1971). Their prescriptions cost Medicare Part D more than their services did: $87,210 for 616 claims, against $12,181 paid for services in 2024. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $770.49 in all, mostly food and beverage.
Overview
| NPI | 1568462851 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 28, 2005 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 05444R | 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 - Gastroenterology (LA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 168 |
|---|---|
| Services billed | 204 across 8 procedure codes |
| Paid by Medicare | $12,181 |
Part D prescriptions in 2024
| Prescriptions (claims) | 616 · 1,027 30-day fills |
|---|---|
| Patients | 146 |
| Total drug cost | $87,210 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | Yale University School of Medicine |
|---|---|
| Graduation year | 1971 |
| Medicare specialty | Gastroenterology |
Medical group
- Gastroenterology Clinic, A Professional Medical CorporationMonroe, LA · 15 clinicians
Hospital affiliations
- Fmol Health St FrancisMonroe, LA
- Glenwood Regional Medical CenterWest Monroe, LA
Industry payments (Open Payments)
- 2025$770.49 · 32 payments from 11 companies
- 2024$949.30 · 39 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $279.04 | 13 |
| Janssen Biotech, Inc. | $136.08 | 3 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $103.81 | 1 |
| Ardelyx, Inc. | $78.08 | 5 |
| Takeda Pharmaceuticals U.S.A., Inc. | $34.61 | 2 |
What the 2025 payments were for
- Food and Beverage$770.49 · 32 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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