John Walker McDonald Sr., M.D.
NPI 1386834281ActiveIndividual· Internal Medicine, Gastroenterology· Baton Rouge, LA
Internal Medicine, Gastroenterology (M.D.) in Baton Rouge, Louisiana, trained at Louisiana State University School of Medicine in Shreveport (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $384,992 for 1,520 claims, against $206,863 paid for services in 2024. Abbvie Inc. was the largest of 10 companies reporting payments in 2025, $641.67 in all, mostly food and beverage.
Overview
| NPI | 1386834281 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 26, 2007 |
| Last updated in NPPES | Nov 7, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD.200458 | LA |
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 (LA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 402 |
|---|---|
| Services billed | 9,067 across 56 procedure codes |
| Paid by Medicare | $206,863 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,520 · 2,450 30-day fills |
|---|---|
| Patients | 481 |
| Total drug cost | $384,992 |
| Generic share | 73% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in Shreveport |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Texas Digestive Disease Consultants, PLLCFlower Mound, TX · 608 clinicians
- Lsuhn Billing LLCLafayette, LA · 206 clinicians
Hospital affiliations
- Baton Rouge General Medical CenterBaton Rouge, LA
- Our Lady of the Lake Regional Medical CenterBaton Rouge, LA
- West Feliciana Parish HospitalSaint Francisville, LA
- Womans HospitalBaton Rouge, LA
Industry payments (Open Payments)
- 2025$641.67 · 41 payments from 10 companies
- 2024$847.46 · 45 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $240.07 | 17 |
| Pfizer Inc. | $77.35 | 5 |
| Ardelyx, Inc. | $75.57 | 4 |
| Gilead Sciences, Inc. | $59.54 | 3 |
| Genzyme Corporation | $52.76 | 3 |
What the 2025 payments were for
- Food and Beverage$641.67 · 41 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 52 gastroenterologists in Baton Rouge · All gastroenterologists in Louisiana