Lavanya Viswanathan, M.D., M.S.
NPI 1982996708ActiveIndividual· Internal Medicine, Gastroenterology· Houston, TX
Internal Medicine, Gastroenterology (M.D., M.S.) with Physicians Referral Service, practicing in Houston, Texas. Medicare paid $30,589 for services to 178 patients in 2024. Ardelyx, Inc. was the largest of 4 companies reporting payments in 2025, $49,488 in all, mostly speaking and faculty fees.
Overview
| NPI | 1982996708 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., M.S. |
| Sole proprietor | No |
| NPI issued | May 12, 2011 |
| Last updated in NPPES | Jun 7, 2024 |
| Certified by provider | Jun 7, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | U8152 | TX |
| Internal Medicine, Gastroenterology | 207RG0100X | A156541 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA); Practitioner - Gastroenterology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 178 |
|---|---|
| Services billed | 259 across 28 procedure codes |
| Paid by Medicare | $30,589 |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical group
- Physicians Referral ServiceHouston, TX · 2,765 clinicians
Industry payments (Open Payments)
- 2025$49,488 · 55 payments from 4 companies
- 2024$20,139 · 33 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $44,100 | 43 |
| Qol Medical, LLC | $5,141 | 10 |
| Lilly USA, LLC | $124.40 | 1 |
| Medtronic, Inc. | $123.32 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$40,375 · 21 payments
- Honoraria$4,500 · 1 payment
- Travel and Lodging$2,603 · 10 payments
- Food and Beverage$2,010 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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