Chaithanya Mallikarjun, MD
NPI 1114101904ActiveIndividual· Internal Medicine, Gastroenterology· San Antonio, TX
Internal Medicine, Gastroenterology (MD) in San Antonio, Texas, trained at Tulane University School of Medicine (class of 2014). In 2024 Medicare paid $76,412 for 295 patients, and Part D covered 247 of their prescriptions, 81% of them generic. Abbvie Inc. was the largest of 21 companies reporting payments in 2025, $2,095 in all, mostly food and beverage.
Overview
| NPI | 1114101904 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Dec 28, 2007 |
| Last updated in NPPES | Nov 20, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | P9220 | TX |
| Internal Medicine, Hepatology | 207RI0008X | MD.201765 | 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 (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 295 |
|---|---|
| Services billed | 783 across 36 procedure codes |
| Paid by Medicare | $76,412 |
Part D prescriptions in 2024
| Prescriptions (claims) | 247 · 493 30-day fills |
|---|---|
| Patients | 116 |
| Total drug cost | $61,156 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Texas Digestive Disease Consultants, PLLCFlower Mound, TX · 608 clinicians
Hospital affiliations
- Baptist Medical CenterSan Antonio, TX
- Methodist HospitalSan Antonio, TX
- Methodist Hospital Stone OakSan Antonio, TX
Industry payments (Open Payments)
- 2025$2,095 · 109 payments from 21 companies
- 2024$1,980 · 106 payments from 24 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $461.83 | 29 |
| Janssen Biotech, Inc. | $328.46 | 16 |
| Lilly USA, LLC | $215.53 | 10 |
| Pfizer Inc. | $148.64 | 9 |
| Ipsen Biopharmaceuticals, Inc | $132.24 | 6 |
What the 2025 payments were for
- Food and Beverage$2,095 · 109 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 136 gastroenterologists in San Antonio · All gastroenterologists in Texas