Vivian Abenaa Asamoah, MD
NPI 1326191081ActiveIndividual· Internal Medicine, Gastroenterology· Katy, TX
Internal Medicine, Gastroenterology (MD) with Houston Gastro Institute PLLC, practicing in Katy, Texas. Their prescriptions cost Medicare Part D more than their services did: $289,779 for 683 claims, against $109,905 paid for services in 2024. Redhill Biopharma Inc. was the largest of 17 companies reporting payments in 2025, $10,619 in all, mostly speaking and faculty fees. Lists Houston Methodist West Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1326191081 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 18, 2007 |
| Last updated in NPPES | Oct 14, 2026 |
| Certified by provider | Oct 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | P0163 | TX |
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 (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 337 |
|---|---|
| Services billed | 1,263 across 31 procedure codes |
| Paid by Medicare | $109,905 |
Part D prescriptions in 2024
| Prescriptions (claims) | 683 · 1,155 30-day fills |
|---|---|
| Patients | 232 |
| Total drug cost | $289,779 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Houston Gastro Institute PLLCKaty, TX · 2 clinicians
Hospital affiliations
- Houston Methodist West HospitalHouston, TX
- Memorial Hermann Katy HospitalKaty, TX
Industry payments (Open Payments)
- 2025$10,619 · 69 payments from 17 companies
- 2024$3,085 · 107 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Redhill Biopharma Inc. | $9,249 | 12 |
| Genzyme Corporation | $233.09 | 4 |
| Pfizer Inc. | $203.19 | 12 |
| Abbvie Inc. | $180.54 | 12 |
| Neuraxis, Inc. | $167.85 | 3 |
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$9,000 · 2 payments
- Food and Beverage$1,619 · 67 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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