William Chastant, MD
NPI 1770087504ActiveIndividual· Internal Medicine, Gastroenterology· Lafayette, LA
Internal Medicine, Gastroenterology (MD) in Lafayette, Louisiana, trained at Louisiana State University School of Medicine in New Orleans (class of 2018). In 2024 Medicare paid $49,849 for 248 patients, and Part D covered 140 of their prescriptions, 81% of them generic. Abbvie Inc. was the largest of 9 companies reporting payments in 2025, $1,002 in all, mostly food and beverage.
Overview
| NPI | 1770087504 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 19, 2018 |
| Last updated in NPPES | Jul 29, 2024 |
| Certified by provider | Jul 29, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 327114 | LA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | 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 | 248 |
|---|---|
| Services billed | 592 across 40 procedure codes |
| Paid by Medicare | $49,849 |
Part D prescriptions in 2024
| Prescriptions (claims) | 140 · 168 30-day fills |
|---|---|
| Patients | 74 |
| Total drug cost | $8,915 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in New Orleans |
|---|---|
| Graduation year | 2018 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Louisiana Gastroenterology Associates LLCLafayette, LA · 28 clinicians
Hospital affiliations
- Ochsner Lafayette General Medical CenterLafayette, LA
- Our Lady of Lourdes Regional Medical Center, IncLafayette, LA
Industry payments (Open Payments)
- 2025$1,002 · 55 payments from 9 companies
- 2024$1,073 · 53 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $312.77 | 16 |
| Janssen Biotech, Inc. | $243.38 | 10 |
| Ardelyx, Inc. | $148.09 | 8 |
| Takeda Pharmaceuticals U.S.A., Inc. | $106.74 | 6 |
| Phathom Pharmaceuticals, Inc. | $93.24 | 9 |
What the 2025 payments were for
- Food and Beverage$941.86 · 53 payments
- Education$60.23 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 28 gastroenterologists in Lafayette · All gastroenterologists in Louisiana