Gregory Shannon, MD
Gastroenterology · Sugar Land, TXNPI 1730148495
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 95.9% of the total across 413 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. It is spread thinly across 29 manufacturers, the largest accounting for just 20.6% — the pattern of someone who eats at a lot of different presentations.
Across 413 payments — averaging $19.73 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$2K
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$1K
- Takeda Pharmaceuticals U.S.A., Inc.$759
- Ironwood Pharmaceuticals, Inc$599
- Braintree Laboratories, Inc.$410
- Johnson & Johnson$406
- plus $3K from 23 others
Across 66 payments — averaging $8663.03 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.
- Genentech, Inc.$509K
- Eli Lilly$44K
- Bausch Health US, LLC$19K
What the payments were for
- Food & beverage$7,81596%
- Education$471%
- Gifts$2853%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| 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 |
| Genentech, Inc. | 1 | $95 |
| 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 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$8,146 in reported general payments places this provider in the 75th 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| LinzessLinaclotide | 71 | $59,857 |
| ZenpepLipase/Protease/Amylase | 22 | $40,255 |
| Mesalamine | 51 | $25,981 |
| ClenpiqSod Picosulf/Mag Ox/Citric Ac | 126 | $21,596 |
| Sucralfate | 147 | $15,857 |
| Peg 3350-ElectrolyteSodium Chloride/Nahco3/Kcl/Peg | 498 | $10,308 |
| Omeprazole | 522 | $7,534 |
| Famotidine | 478 | $6,183 |
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 102 | $5,974 |
| Dexlansoprazole DrDexlansoprazole | 14 | $3,796 |
| Mesalamine ErMesalamine | 13 | $2,587 |
| SutabSod Sulf/Pot Chloride/Mag Sulf | 13 | $2,065 |
| Lubiprostone | 11 | $1,646 |
| CholestyramineCholestyramine (With Sugar) | 23 | $1,568 |
| Dicyclomine Hcl | 26 | $921 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| AbbVieLinzess | $1,678 | $59,85771 claims |
| Aimmune Therapeutics, Inc.Zenpep | $271 | $40,25522 claims |
| Ferring Pharmaceuticals Inc.Clenpiq | $91 | $21,596126 claims |
| Braintree Laboratories, Inc.Sutab | $410 | $2,06513 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 75th percentile of 1,350 gastroenterology providers in Texas.
Other gastroenterology in Sugar Land
- Charles PhanSugar Land$139K
- John FordtranDallas$9.9M
- Michael BrownDallas$5.5M
- Bincy AbrahamHouston$1.6M
- Mazen NoureddinHouston$1.5M
- Stephen PappasHouston$1.4M
- Anish PatelFort Sam Houston$1.3M
- Timothy RitterSouthlake$961K
- Parvez MantryDallas$958K
- Nadege GunnWaco$933K
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.