Dean Chang, MD
Gastroenterology · Hamden, CTNPI 1770564247
Payments from drug & device makers
Across 640 payments — averaging $25.68 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Gilead$5K
- AbbVie$4K
- Madrigal Pharmaceuticals$805
- Bristol Myers Squibb$795
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$715
- QOL Medical, LLC$704
- plus $5K from 30 others
What the payments were for
- Consulting fees$2,06013%
- Food & beverage$14,37487%
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 |
|---|---|---|
| Gilead | 156 | $4,903 |
| AbbVie(2 entities) | 187 | $3,775 |
| Madrigal Pharmaceuticals | 25 | $805 |
| Bristol Myers Squibb | 32 | $795 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 38 | $715 |
| QOL Medical, LLC | 23 | $704 |
| Ardelyx, Inc. | 20 | $565 |
| Johnson & Johnson | 18 | $544 |
| Takeda Pharmaceuticals U.S.A., Inc. | 24 | $533 |
| Redhill Biopharma Inc. | 7 | $358 |
| Aimmune Therapeutics, Inc. | 5 | $322 |
| Pfizer | 17 | $302 |
| AstraZeneca | 3 | $249 |
| Ironwood Pharmaceuticals, Inc | 12 | $240 |
| Intercept Pharmaceuticals, Inc. | 11 | $208 |
| Phathom Pharmaceuticals, Inc. | 5 | $201 |
| E.r. Squibb & Sons, L.L.C. | 2 | $169 |
| Regeneron Healthcare Solutions, Inc. | 7 | $165 |
| Sanofi | 6 | $147 |
| Ferring Pharmaceuticals Inc. | 10 | $144 |
| Lilly USA, LLC | 6 | $128 |
| Pentax Of America, Inc. | 4 | $65 |
| Ipsen Biopharmaceuticals, Inc | 3 | $64 |
| Fresenius Kabi USA, LLC | 3 | $63 |
| Shionogi Inc | 3 | $47 |
| Braintree Laboratories, Inc. | 2 | $34 |
| Boston Scientific | 2 | $29 |
| Mirum Pharmaceuticals, Inc. | 1 | $23 |
| Nestle Healthcare Nutrition Inc. | 1 | $23 |
| Digestive Care, Inc. | 1 | $22 |
| Intra-sana Laboratories | 1 | $20 |
| Vivus LLC | 1 | $17 |
| Tempus AI, Inc | 1 | $16 |
| Merck | 1 | $14 |
| Portola Pharmaceuticals, LLC | 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
$16,434 in reported general payments places this provider in the 80th percentile of 326 gastroenterology providers in Connecticut.
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 |
|---|---|---|
| ZeposiaOzanimod Hydrochloride | 15 | $119,192 |
| CreonLipase/Protease/Amylase | 58 | $113,345 |
| LinzessLinaclotide | 51 | $47,021 |
| MotegrityPrucalopride Succinate | 21 | $25,600 |
| Dexlansoprazole DrDexlansoprazole | 104 | $24,413 |
| TrulancePlecanatide | 16 | $13,571 |
| Mesalamine | 31 | $13,024 |
| Ursodiol | 44 | $9,432 |
| Mesalamine DrMesalamine | 11 | $4,847 |
| Mesalamine ErMesalamine | 15 | $4,228 |
| Pantoprazole Sodium | 232 | $3,049 |
| Ondansetron Hcl | 14 | $2,223 |
| Rabeprazole Sodium | 44 | $1,809 |
| Dicyclomine Hcl | 40 | $1,586 |
| Omeprazole | 92 | $1,239 |
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 |
|---|---|---|
| AbbVieCreon, Linzess | $3,775 | $160,366109 claims |
| E.r. Squibb & Sons, L.L.C.Zeposia | $169 | $119,19215 claims |
| Takeda Pharmaceuticals U.S.A., Inc.Motegrity | $533 | $25,60021 claims |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLCTrulance | $715 | $13,57116 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 80th percentile of 326 gastroenterology providers in Connecticut.
Other gastroenterology in Hamden
- Paul FeuerstadtHamden$1.4M
- Renuka UmashankerHamden$197K
- David HassHamden$190K
- Pramod MistryNew Haven$6M
- Salam ZakkoBristol$2.7M
- Angelo ParedesMiddletown$1.3M
- James FrestonFarmington$778K
- Jill GaidosNew Haven$750K
- Houman RezaizadehFarmington$720K
- James BoyerNew Haven$648K
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.