Madhu B. Challapalli, MD
NPI 1609847029ActiveIndividual· Internal Medicine, Cardiovascular Disease· San Antonio, TX
Internal Medicine, Cardiovascular Disease (MD) in San Antonio, Texas, trained at Texas Tech University Health Science Center School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $237,774 for 1,384 claims, against $97,175 paid for services in 2024. Amgen Inc. was the largest of 4 companies reporting payments in 2025, $344.47 in all, mostly food and beverage.
Overview
| NPI | 1609847029 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 1, 2006 |
| Last updated in NPPES | Sep 16, 2026 |
| Certified by provider | Sep 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | L0999 | TX |
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 - Radiation Oncology (NV); Practitioner - Cardiovascular Disease (Cardiology) (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 505 |
|---|---|
| Services billed | 1,110 across 35 procedure codes |
| Paid by Medicare | $97,175 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,384 · 3,383 30-day fills |
|---|---|
| Patients | 225 |
| Total drug cost | $237,774 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Texas Tech University Health Science Center School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Internal Medicine |
Medical groups
- Christus Trinity Clinic TexasTyler, TX · 1,540 clinicians
- Challapalli Cardiology PCReno, NV · 8 clinicians
Hospital affiliation
- Christus Santa Rosa Hospital-San MarcosSan Marcos, TX
Industry payments (Open Payments)
- 2025$344.47 · 8 payments from 4 companies
- 2024$662.97 · 8 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $215.92 | 2 |
| Novo Nordisk Inc | $76.99 | 4 |
| Abiomed | $36.25 | 1 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $15.31 | 1 |
What the 2025 payments were for
- Food and Beverage$344.47 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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