Has John Chan, MD received payments from drug or device companies?

Yes. Drug and device makers reported $535 in general payments to John Chan, MD across 11 transactions between 2019–2025. Most Open Payments records nationally are meals worth under $20; a reported payment is not evidence of wrongdoing.

Does a payment mean John Chan, MD did something wrong?

No. Federal law requires drug and device makers to report almost every transfer of value to a physician, including a $14 sandwich at a lunch presentation. Consulting fees, research funding and royalties to device inventors are ordinary, legal parts of medicine. This site reports what was disclosed; it makes no allegation.

Where does this information about John Chan, MD come from?

The U.S. Centers for Medicare & Medicaid Services. Payments come from Open Payments, published under the Physician Payments Sunshine Act. Billing and prescribing figures come from the Medicare Physician & Other Practitioners and Part D Prescriber public use files for 2024.

John Chan, MD

Ophthalmology · Union City, CANPI 1609928837

Payments from drug & device makers

What this record shows

Almost everything reported here is food and beverage — 97.7% of the total across 11 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 7 manufacturers reported payments, led by Alcon at 28.9% of the total. That places this record below the midpoint for ophthalmology clinicians in CA, where the typical reported total is $1,218.

$535in general payments, 2019–2025

Across 11 payments — averaging $48.64 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Alcon$155
AbbVie$133
Apellis Pharmaceuticals, Inc.$74
Clovis Oncology, Inc.$48
Bausch & Lomb Americas Inc.$47
Merck$43
plus $35 from 1 others

$25,110in research payments, 2019–2025

Across 5 payments — averaging $5022.07 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.

Astrazeneca UK Limited$18K
Merck$6K
E.r. Squibb & Sons, L.L.C.$894

What the payments were for

Travel & lodging$122%
Food & beverage$52398%

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
Alcon	2	$155
AbbVie	1	$133
Apellis Pharmaceuticals, Inc.	1	$74
Clovis Oncology, Inc.	4	$48
Bausch & Lomb Americas Inc.	1	$47
Merck	1	$43
Davol Inc.	1	$35

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.

Elahere$133

How this compares

$535 in reported general payments places this provider in the 30th percentile of 2,513 ophthalmology providers in California.

See all ophthalmology providers in California →

Medicare billing

Part B allowed, 2024

$5,323

Medicare patients

Services billed

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
Cyclosporine	62	$8,788
Latanoprost	486	$8,044
Timolol Maleate	267	$6,071
Dorzolamide-TimololDorzolamide Hcl/Timolol Maleat	173	$4,423
Brimonidine Tartrate	123	$3,007
Prednisolone Acetate	47	$2,476
Bimatoprost	20	$2,370
Dorzolamide Hcl	23	$608
Neomycin-Polymyxin-DexamethNeomycin/Polymyxin B/Dexametha	44	$567
ErythromycinErythromycin Base	32	$439
Ofloxacin	23	$369
Polymyxin B Sul-TrimethoprimPolymyxin B Sulf/Trimethoprim	21	$268
Acyclovir	11	$211

Paid to pharmacies, not to this prescriber.

Other ophthalmology in Union City

Daniel SchwartzSan Francisco$8M
Michael BerlinWest Hollywood$5.7M
Gilbert KlimanMenlo Park$1.5M
Kuldev SinghStanford$1.5M
Raymond DouglasBeverly Hills$1.3M
John AffeldtLoma Linda$1.1M
Srinivas SaddaPasadena$1M
Sheri RowenNewport Beach$1M
Savak TeymoorianLaguna Hills$955K
Andrew MoshfeghiLos Angeles$895K

See the full list for California →

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.

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