Gene Chang, MD
Gastroenterology · Munster, INNPI 1033240411
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $10,507 of the $13,883 with a category attached, or 75.7%. 28 manufacturers reported payments, led by Braintree Laboratories, Inc. at 25.6% of the total. Reporting peaked in 2023 at $3,334 and has fallen 88.3% since, to $390 in 2025.
Across 571 payments — averaging $24.31 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Braintree Laboratories, Inc.$4K
- AbbVie$1K
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$1K
- Nestle Healthcare Nutrition Inc.$1K
- Boston Scientific$1K
- Johnson & Johnson$728
- plus $4K from 22 others
What the payments were for
- Grants$3,00022%
- Food & beverage$10,50776%
- Education$1321%
- Gifts$2442%
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 |
|---|---|---|
| Braintree Laboratories, Inc. | 38 | $3,550 |
| AbbVie(2 entities) | 141 | $1,465 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 116 | $1,463 |
| Nestle Healthcare Nutrition Inc. | 83 | $1,242 |
| Boston Scientific | 13 | $1,214 |
| Johnson & Johnson(3 entities) | 27 | $728 |
| Bristol Myers Squibb | 46 | $530 |
| Janssen Scientific Affairs, LLC | 4 | $464 |
| E.r. Squibb & Sons, L.L.C. | 4 | $350 |
| Takeda Pharmaceuticals U.S.A., Inc. | 28 | $339 |
| Olympus America Inc. | 3 | $321 |
| Sanofi | 7 | $276 |
| Medtronic | 2 | $207 |
| Steris Corporation | 2 | $204 |
| Ambu Inc. | 3 | $200 |
| Ironwood Pharmaceuticals, Inc | 11 | $165 |
| Gilead | 10 | $157 |
| Romark Laboratories, LC | 4 | $151 |
| Ardelyx, Inc. | 3 | $138 |
| Pfizer | 9 | $136 |
| Sanofi-aventis U.S. LLC | 1 | $125 |
| Madrigal Pharmaceuticals | 2 | $117 |
| GI Supply, Inc. | 1 | $116 |
| Merck | 5 | $82 |
| QOL Medical, LLC | 3 | $52 |
| UCB, Inc. | 2 | $35 |
| Vivus LLC | 2 | $33 |
| Aimmune Therapeutics, Inc. | 1 | $21 |
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.
- SUTAB$3,220
- STELARA$369
- Alinia$332
- ZEPOSIA$267
- ACQUIRE$262
- SUFLAVE$220
- EndoFlip$172
- Olympus Biliary Devices$162
- TRUFREEZE$159
- ORISE$150
- WATCHMAN FLX$144
- Monarch Platform$138
- DISEASE STATE$125
- SPYGLASS$123
- VISIGLIDE$122
- Watchman$114
- DUPIXENT$114
- LINX Reflux Management System$111
- REZDIFFRA$103
- XIFAXAN$100
How this compares
$13,883 in reported general payments places this provider in the 85th percentile of 323 gastroenterology providers in Indiana.
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 |
|---|---|---|
| ZenpepLipase/Protease/Amylase | 14 | $75,903 |
| SutabSod Sulf/Pot Chloride/Mag Sulf | 79 | $12,627 |
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 182 | $10,719 |
| Pantoprazole Sodium | 418 | $6,176 |
| Sucralfate | 14 | $743 |
| Gavilyte-CPeg3350/Sod Sulf,bicarb,cl/Kcl | 37 | $574 |
| Omeprazole | 56 | $432 |
| Famotidine | 23 | $160 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 12 | $149 |
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 |
|---|---|---|
| Aimmune Therapeutics, Inc.Zenpep | $21 | $75,90314 claims |
| Braintree Laboratories, Inc.Sutab | $3,550 | $12,62779 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 85th percentile of 323 gastroenterology providers in Indiana.
Other gastroenterology in Munster
- Anoop AppannagariMunster$120K
- Priti NuthakkiMunster$17K
- Michelle SrisuwananukornMunster$13K
- Navin KumarMunster$12K
- Mohsen KhanMunster$10K
- Douglas RexIndianapolis$557K
- Ajay JainIndianapolis$432K
- Jonathan ObertNew Albany$302K
- Monika FischerIndianapolis$258K
- Naga ChalasaniIndianapolis$255K
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.