John Vierling
Gastroenterology · Houston, TXNPI 1043390388
Payments from drug & device makers
$2,809,227in general payments, 2019–2025
Across 591 payments — averaging $4753.35 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intercept Pharmaceuticals, Inc.$845K
- Gilead$518K
- Novartis$320K
- AbbVie$311K
- E.r. Squibb & Sons, L.L.C.$270K
- Pfizer$150K
- plus $396K from 17 others
General payments by program year
19
20
21
22
23
24
25
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Intercept Pharmaceuticals, Inc. | 197 | $844,714 |
| Gilead | 156 | $518,473 |
| Novartis | 12 | $320,269 |
| AbbVie(2 entities) | 55 | $310,515 |
| E.r. Squibb & Sons, L.L.C. | 14 | $269,589 |
| Pfizer | 21 | $149,930 |
| Merck | 24 | $75,121 |
| Intercept Pharma Europe Ltd. | 15 | $71,062 |
| Eiger Biopharmaceuticals, Inc. | 15 | $55,915 |
| Mallinckrodt Enterprises LLC | 21 | $31,572 |
| AstraZeneca | 10 | $26,536 |
| Ipsen Biopharmaceuticals, Inc | 10 | $25,209 |
| Mallinckrodt Hospital Products Inc. | 8 | $24,359 |
| Ipsen Pharma SAS | 3 | $23,965 |
| Eli Lilly | 4 | $22,663 |
| GSK | 17 | $17,816 |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $9,996 |
| Ipsen Innovation | 1 | $3,735 |
| Orphalan Inc | 2 | $3,172 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 1 | $2,500 |
| Amgen | 1 | $1,950 |
| Fujifilm Wako Diagnostics U.S.A. Corporation | 1 | $126 |
| Perspectum Diagnostics Ltd | 1 | $45 |
How this compares
$2,809,227 in reported general payments places this provider in the 95th percentile of 1,350 gastroenterology providers in Texas.
Other gastroenterology in Houston
- Mazen NoureddinHouston$6.1M
- James MaherHouston$5.3M
- Uma MohanHouston$5M
- Bincy AbrahamHouston$2.5M
- Jason HouHouston$2.3M
- Jignesh ShahHouston$1.7M
- Mouhamad Al-SabbaghHouston$1.6M
- Mohamed OthmanHouston$1.6M
- Harry OjeasHouston$1.5M
- Stephen PappasHouston$1.4M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.