Shanker Das Kundumadam, MD
NPI 1720475403ActiveIndividual· Internal Medicine, Gastroenterology· Festus, MO
Internal Medicine, Gastroenterology (MD) with Mercy Clinic Gastroenterology LLC, practicing in Festus, Missouri. Their prescriptions cost Medicare Part D more than their services did: $373,167 for 519 claims, against $56,124 paid for services in 2024. Phathom Pharmaceuticals, Inc. was the largest of 9 companies reporting payments in 2025, $687.53 in all, mostly food and beverage. Lists Mercy Hospital Jefferson and 1 other hospital as hospital affiliations.
Overview
| NPI | 1720475403 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 21, 2015 |
| Last updated in NPPES | Aug 29, 2025 |
| Certified by provider | Aug 29, 2025 |
| Reactivated | Dec 22, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 2024046631 | MO |
| Internal Medicine, Gastroenterology | 207RG0100X | MD-49141 | IA |
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 (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 287 |
|---|---|
| Services billed | 537 across 45 procedure codes |
| Paid by Medicare | $56,124 |
Part D prescriptions in 2024
| Prescriptions (claims) | 519 · 653 30-day fills |
|---|---|
| Patients | 350 |
| Total drug cost | $373,167 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical group
- Mercy Clinic Gastroenterology LLCWashington, MO · 67 clinicians
Hospital affiliations
- Mercy Hospital JeffersonCrystal City, MO
- Mercy Hospital SouthSaint Louis, MO
Industry payments (Open Payments)
- 2025$687.53 · 30 payments from 9 companies
- 2024$576.16 · 25 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $192.47 | 4 |
| Abbvie Inc. | $182.10 | 10 |
| Regeneron Healthcare Solutions, Inc. | $67.92 | 3 |
| Celltrion USA Inc. | $66.69 | 4 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $55.62 | 3 |
What the 2025 payments were for
- Food and Beverage$687.53 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Festus
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- 1720458797