Hassaan Zia, MD
Gastroenterology · Milwaukee, WINPI 1669887519
Payments from drug & device makers
What this record shows
The money is spread across several categories — food and beverage (46.8%), travel and lodging and grants — rather than concentrated in one kind of arrangement. 22 manufacturers reported payments, led by Olympus Corporation Of The Americas at 32.6% of the total. Reporting peaked in 2023 at $2,376 and has fallen 80.6% since, to $461 in 2025. Among gastroenterology clinicians in WI with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 198 payments — averaging $43.69 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Olympus Corporation Of The Americas$3K
- Boston Scientific$2K
- AbbVie$828
- Cook Medical LLC$800
- Johnson & Johnson$437
- Apollo Endosurgery US Inc$320
- plus $2K from 16 others
What the payments were for
- Grants$8009%
- Travel & lodging$3,80444%
- Food & beverage$4,04647%
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 |
|---|---|---|
| Olympus Corporation Of The Americas | 25 | $2,824 |
| Boston Scientific | 18 | $1,695 |
| AbbVie | 49 | $828 |
| Cook Medical LLC | 5 | $800 |
| Johnson & Johnson | 29 | $437 |
| Apollo Endosurgery US Inc | 3 | $320 |
| Daiichi Sankyo Inc. | 9 | $249 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 13 | $231 |
| Pfizer | 12 | $197 |
| ERBE USA Inc | 3 | $192 |
| Takeda Pharmaceuticals U.S.A., Inc. | 12 | $185 |
| E.r. Squibb & Sons, L.L.C. | 1 | $125 |
| Bristol Myers Squibb | 5 | $116 |
| Olympus America Inc. | 1 | $85 |
| Perspectum Diagnostics Ltd | 1 | $83 |
| Sanofi | 3 | $81 |
| Gilead | 3 | $71 |
| Janssen Scientific Affairs, LLC | 1 | $50 |
| Amgen | 2 | $45 |
| Mallinckrodt Hospital Products Inc. | 1 | $15 |
| Braintree Laboratories, Inc. | 1 | $15 |
| Micro-tech Endoscopy USA, Inc. | 1 | $4 |
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.
- Single Use Electrosurgical Knife KD-655$2,390
- DISPOSABLE DISTAL ATTACHMENT$2,390
- Olympus$1,387
- ORISE$616
- GENERAL - THERAPIES$279
- OverStitch Endoscopic Suturing System$230
- AXIOS$150
- INJECTAFER$125
- ZEPOSIA$125
- EXALT MODEL D CONTROLLER$111
- ACQUIRE$105
- Erbe VIO3$100
How this compares
$8,650 in reported general payments places this provider in the 90th percentile of 285 gastroenterology providers in Wisconsin.
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 |
|---|---|---|
| Omeprazole | 71 | $666 |
| Gavilyte-CPeg3350/Sod Sulf,bicarb,cl/Kcl | 24 | $422 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 28 | $391 |
| Famotidine | 22 | $282 |
| Peg 3350-ElectrolyteSodium Chloride/Nahco3/Kcl/Peg | 11 | $194 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Milwaukee
- Daniel SteinMilwaukee$227K
- Poonam Beniwal-PatelMilwaukee$108K
- Matthew PellerMilwaukee$63K
- Chetan MittalMilwaukee$53K
- Patrick SanvansonMilwaukee$40K
- Nalini GudaMilwaukee$29K
- Kulwinder DuaMilwaukee$16K
- Lyndon HernandezMilwaukee$15K
- Sunil KapurMilwaukee$8K
- James Philip EstebanMilwaukee$7K
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.