Margaret Zhou, MD
Gastroenterology · Stanford, CANPI 1184157992
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $241,601 of the $287,935 with a category attached, or 83.9%. Capsovision, Inc. accounts for 83.9% of it on its own, with 11 other manufacturers making up the rest. 2025 is the largest year on record at $163,013, more than ten times the $122 reported in 2021. Among gastroenterology clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 79 payments — averaging $3644.75 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Capsovision, Inc.$242K
- Boston Scientific$42K
- Olympus Corporation Of The Americas$2K
- Ovesco Endoscopy USA, Inc.$876
- Creo Medical Inc.$426
- ERBE USA Inc$205
- plus $738 from 6 others
What the payments were for
- Consulting fees$241,60184%
- Grants$37,50013%
- Travel & lodging$6,1692%
- Food & beverage$2,4271%
- Education$2390%
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 |
|---|---|---|
| Capsovision, Inc. | 18 | $241,601 |
| Boston Scientific | 34 | $41,942 |
| Olympus Corporation Of The Americas | 15 | $2,147 |
| Ovesco Endoscopy USA, Inc. | 1 | $876 |
| Creo Medical Inc. | 2 | $426 |
| ERBE USA Inc | 1 | $205 |
| Medtronic | 3 | $158 |
| Olympus America Inc. | 1 | $138 |
| Lucid Diagnostics Inc. | 1 | $124 |
| AbbVie | 1 | $122 |
| Aadi Bioscience, Inc. | 1 | $105 |
| Steris Corporation | 1 | $92 |
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.
- CapsoCam Colon$241,601
- GENERAL - THERAPIES$25,000
- Single Use Electrosurgical Knife KD-655$1,875
- DISPOSABLE DISTAL ATTACHMENT$1,875
- Resolution 360 Clip$1,528
- Olympus$1,170
- Speedboat Ultraslim (SB1L)$389
- ACQUIRE$239
- VIO3 EJ2$205
- EXALT Model D$150
- AXIOS$143
- VISIGLIDE$138
- Humira$122
- FYARRO$105
How this compares
$287,935 in reported general payments places this provider in the 95th 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 |
|---|---|---|
| Peg 3350-ElectrolyteSodium Chloride/Nahco3/Kcl/Peg | 25 | $508 |
| Omeprazole | 21 | $220 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 11 | $216 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Stanford
- Joo HwangStanford$1M
- Shai FriedlandStanford$452K
- Mike WeiStanford$382K
- Andrew LiStanford$217K
- Walter ParkStanford$216K
- Paul KwoStanford$150K
- Bennett RothLos Angeles$2.8M
- Douglas NguyenMission Viejo$2M
- Sammy SaabLos Angeles$1.9M
- Kenneth ChangNewport Beach$1.3M
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.