Gregory Shannon, MD
Gastroenterology · Sugar Land, TXNPI 1730148495
Payments from drug & device makers
Across 478 payments — averaging $1211.39 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Genentech, Inc.$509K
- Eli Lilly$43K
- Bausch Health US, LLC$19K
- AbbVie$2K
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$1K
- Takeda Pharmaceuticals U.S.A., Inc.$759
- plus $4K from 25 others
Across 1 payment — averaging $859.89 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Eli Lilly$860
General payments by program year
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 |
|---|---|---|
| Genentech, Inc. | 56 | $508,774 |
| Eli Lilly | 5 | $42,971 |
| Bausch Health US, LLC | 5 | $19,250 |
| AbbVie(2 entities) | 90 | $1,678 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 89 | $1,381 |
| Takeda Pharmaceuticals U.S.A., Inc. | 36 | $759 |
| Ironwood Pharmaceuticals, Inc | 34 | $599 |
| Braintree Laboratories, Inc. | 16 | $410 |
| Johnson & Johnson | 24 | $406 |
| Nestle Healthcare Nutrition Inc. | 16 | $373 |
| Bristol Myers Squibb | 23 | $371 |
| Aimmune Therapeutics, Inc. | 11 | $271 |
| Merck | 13 | $250 |
| E.r. Squibb & Sons, L.L.C. | 2 | $217 |
| Pfizer | 12 | $200 |
| Lilly USA, LLC | 5 | $154 |
| Redhill Biopharma Inc. | 7 | $149 |
| Ardelyx, Inc. | 6 | $148 |
| Medtronic | 1 | $148 |
| Sanofi | 3 | $104 |
| Gilead | 6 | $102 |
| Ferring Pharmaceuticals Inc. | 6 | $91 |
| Evoke Pharma, Inc. | 3 | $58 |
| Phathom Pharmaceuticals, Inc. | 1 | $36 |
| Ipsen Biopharmaceuticals, Inc | 1 | $30 |
| Madrigal Pharmaceuticals | 1 | $28 |
| Vivus LLC | 2 | $22 |
| Shire North American Group Inc | 1 | $21 |
| QOL Medical, LLC | 1 | $19 |
| Alfasigma USA, Inc. | 1 | $13 |
| Olympus America Inc. | 1 | $12 |
How this compares
$579,046 in reported general payments places this provider in the 95th percentile of 1,350 gastroenterology providers in Texas.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Other gastroenterology in Sugar Land
- Eric LawitzSan Antonio$59.5M
- George DuvallTyler$17.5M
- John FordtranDallas$9.9M
- Timothy RitterSouthlake$7.7M
- Parvez MantryDallas$6.4M
- Mazen NoureddinHouston$6.1M
- Nadege GunnWaco$5.7M
- Michael BrownDallas$5.5M
- James MaherHouston$5.3M
- Stephen HarrisonLive Oak$5.3M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.