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Shannon Marek, MD

Gastroenterology · San Marcos, TXNPI 1528282050

Payments from drug & device makers

$615,976in general payments, 2019–2025

Across 601 payments — averaging $1024.92 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

  • Gilead$495K
  • Pfizer$77K
  • E.r. Squibb & Sons, L.L.C.$37K
  • AbbVie$2K
  • Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$909
  • Bristol Myers Squibb$542
  • plus $3K from 31 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.

CompanyPaymentsTotal
Gilead137$494,595
Pfizer(2 entities)41$77,383
E.r. Squibb & Sons, L.L.C.5$37,172
AbbVie(2 entities)141$2,093
Salix Pharmaceuticals, A Division Of Bausch Health US, LLC69$909
Bristol Myers Squibb39$542
Johnson & Johnson(2 entities)34$538
QOL Medical, LLC18$418
Takeda Pharmaceuticals U.S.A., Inc.18$305
Janssen Scientific Affairs, LLC2$235
Sanofi7$176
Regeneron Healthcare Solutions, Inc.5$162
Lilly USA, LLC6$146
Phathom Pharmaceuticals, Inc.8$140
Intercept Pharmaceuticals, Inc.9$133
Ferring Pharmaceuticals Inc.9$122
Merck5$104
Madrigal Pharmaceuticals5$94
AMAG Pharmaceuticals, Inc.4$70
Ipsen Biopharmaceuticals, Inc3$67
Celltrion USA Inc.3$65
Shield Therapeutics Inc3$57
Ardelyx, Inc.3$46
Pharmacosmos Therapeutics Inc.2$45
Ironwood Pharmaceuticals, Inc3$44
Nestle Healthcare Nutrition Inc.2$40
Evoke Pharma, Inc.2$37
Amgen2$36
Aimmune Therapeutics, Inc.2$36
Daiichi Sankyo Inc.2$34
Romark Laboratories, LC3$31
Lucid Diagnostics Inc.1$24
Vivus LLC1$23
Braintree Laboratories, Inc.1$20
Azurity Pharmaceuticals, Inc.1$17
UCB, Inc.1$17
Gastrogpo, LLC4$0

How this compares

$615,976 in reported general payments places this provider in the 95th percentile of 1,350 gastroenterology providers in Texas.

See all gastroenterology providers in Texas →

Medicare billing

Part B allowed, 2024
$306,974
Medicare patients
599
Services billed
7,414

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 San Marcos

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Where these figures come from

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