John Chang, MD
Gastroenterology · San Diego, CANPI 1265594527
Payments from drug & device makers
Across 27 payments — averaging $2903.69 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Takeda Pharmaceuticals U.S.A., Inc.$46K
- AbbVie$18K
- Merck$14K
- Boston Scientific$34
What the payments were for
- Consulting fees$29,50092%
- Speaking & faculty fees$30%
- Travel & lodging$2,3127%
- Food & beverage$2321%
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 |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc. | 6 | $46,355 |
| AbbVie | 11 | $18,477 |
| Merck | 8 | $13,534 |
| Boston Scientific | 2 | $34 |
How this compares
$78,400 in reported general payments places this provider in the 85th percentile of 1,885 gastroenterology providers in California.
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 |
|---|---|---|
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 124 | $7,902 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 71 | $1,137 |
| Peg-3350 And ElectrolytesPeg3350/Sod Sulf,bicarb,cl/Kcl | 44 | $748 |
| Peg3350-Sod Sul-Nacl-Kcl-Asb-CPeg3350/Sod Sul/Nacl/Kcl/Asb/C | 14 | $645 |
| Omeprazole | 27 | $141 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in San Diego
- Brigid BolandSan Diego$2.4M
- William SandbornSan Diego$2.2M
- Naveen GaraSan Diego$1.5M
- Michael BennettSan Diego$1.5M
- Taddese DestaSan Diego$1.4M
- Hyun KimSan Diego$1.3M
- Vijayalak PrathaSan Diego$1.2M
- David KunkelSan Diego$679K
- Peter WinkleCypress$116.7M
- Manuchehr DaraniSanta Ana$17.7M
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.