William R. Kessler, MD
NPI 1114976685ActiveIndividual· Internal Medicine, Gastroenterology· Indianapolis, IN
Internal Medicine, Gastroenterology (MD) in Indianapolis, Indiana, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $108,281 for 806 claims, against $43,424 paid for services in 2024. Takeda Pharmaceuticals U.S.A., Inc. was the largest of 13 companies reporting payments in 2025, $544.59 in all, mostly food and beverage.
Overview
| NPI | 1114976685 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 10, 2006 |
| Last updated in NPPES | Jan 13, 2021 |
| Certified by provider | Jan 13, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 010S3971A | IN |
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 (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 271 |
|---|---|
| Services billed | 369 across 29 procedure codes |
| Paid by Medicare | $43,424 |
Part D prescriptions in 2024
| Prescriptions (claims) | 806 · 1,296 30-day fills |
|---|---|
| Patients | 403 |
| Total drug cost | $108,281 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Gastroenterology |
Medical group
- Witham Memorial HospitalZionsville, IN · 108 clinicians
Hospital affiliation
- Witham Health ServicesLebanon, IN
Industry payments (Open Payments)
- 2025$544.59 · 24 payments from 13 companies
- 2024$286.89 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc. | $127.12 | 5 |
| Phathom Pharmaceuticals, Inc. | $92.35 | 4 |
| Abbvie Inc. | $55.35 | 3 |
| Eisai Inc. | $51.23 | 2 |
| Ardelyx, Inc. | $42.77 | 2 |
What the 2025 payments were for
- Food and Beverage$544.59 · 24 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 140 gastroenterologists in Indianapolis · All gastroenterologists in Indiana