Jonathon Casey Chapman, MD
NPI 1689867434ActiveIndividual· Internal Medicine, Gastroenterology· Baton Rouge, LA
Internal Medicine, Gastroenterology (MD) in Baton Rouge, Louisiana, trained at Louisiana State University School of Medicine in New Orleans (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $3,093,995 for 386 claims, against $4,913 paid for services in 2024. Abbvie Inc. was the largest of 18 companies reporting payments in 2025, $159,631 in all, mostly speaking and faculty fees.
Overview
| NPI | 1689867434 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 24, 2007 |
| Last updated in NPPES | Nov 9, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD 201621 | LA |
| Internal Medicine | 207R00000X | 201621 | 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 | 36 |
|---|---|
| Services billed | 62 across 11 procedure codes |
| Paid by Medicare | $4,913 |
Part D prescriptions in 2024
| Prescriptions (claims) | 386 · 523 30-day fills |
|---|---|
| Patients | 77 |
| Total drug cost | $3,093,995 |
| Generic share | 33% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in New Orleans |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Gastroenterology |
Medical groups
- Texas Digestive Disease Consultants, PLLCFlower Mound, TX · 608 clinicians
- Lsuhn Billing LLCLafayette, LA · 206 clinicians
- Baton Rouge General Medical CenterBaton Rouge, LA · 56 clinicians
Hospital affiliation
- Baton Rouge General Medical CenterBaton Rouge, LA
Industry payments (Open Payments)
- 2025$159,631 · 194 payments from 18 companies
- 2024$152,566 · 307 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $106,481 | 65 |
| Lilly USA, LLC | $12,916 | 16 |
| Medtronic, Inc. | $11,540 | 14 |
| Biocon Biologics Inc | $9,741 | 4 |
| Janssen Biotech, Inc. | $6,890 | 29 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$81,300 · 22 payments
- Consulting Fee$61,450 · 12 payments
- Travel and Lodging$12,759 · 22 payments
- Food and Beverage$4,122 · 138 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