Has Hyun Don Yun received payments from drug or device companies?

Yes. Drug and device makers reported $7,278 in general payments to Hyun Don Yun across 211 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 Hyun Don Yun 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 Hyun Don Yun 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.

Hyun Don Yun

Hematology & Oncology · Riverside, CANPI 1508090473

Payments from drug & device makers

What this record shows

The money is spread across several categories — food and beverage (55.9%), consulting fees and speaking fees — rather than concentrated in one kind of arrangement. It is spread thinly across 51 manufacturers, the largest accounting for just 19.7%.

$7,278in general payments, 2019–2025

Across 211 payments — averaging $34.49 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Daiichi Sankyo Inc.$1K
AstraZeneca$1K
Cardinal Health 110 LLC$550
Beigene USA, Inc.$545
Novartis$488
Bristol Myers Squibb$305
plus $3K from 45 others

What the payments were for

Consulting fees$2,25031%
Speaking & faculty fees$76010%
Food & beverage$4,07056%
Education$1983%

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
Daiichi Sankyo Inc.	5	$1,433
AstraZeneca(2 entities)	8	$1,176
Cardinal Health 110 LLC	2	$550
Beigene USA, Inc.	23	$545
Novartis	25	$488
Bristol Myers Squibb	19	$305
Johnson & Johnson	10	$238
Astellas Pharma US Inc	6	$200
E.r. Squibb & Sons, L.L.C.	11	$195
Pharmacyclics LLC, An Abbvie Company	7	$171
Takeda Pharmaceuticals U.S.A., Inc.	3	$144
AVEO Pharmaceuticals, Inc.	4	$103
Rigel Pharmaceuticals, Inc.	4	$103
Pfizer	5	$97
Lilly USA, LLC	7	$97
Amgen	5	$93
Puma Biotechnology, Inc.	4	$93
Seagen Inc.	4	$91
Bayer	4	$88
Ipsen Biopharmaceuticals, Inc	4	$86
Sanofi	5	$83
Merck	4	$76
Genentech USA, Inc.	3	$64
Incyte Corporation	3	$59
Dova Pharmaceuticals	2	$49
Global Blood Therapeutics, Inc.	3	$47
Karyopharm Therapeutics Inc.	2	$44
Boehringer Ingelheim	2	$42
Acrotech Biopharma Inc.	2	$38
Eisai Inc.	2	$34
GSK	1	$33
Alnylam Pharmaceuticals Inc.	2	$29
EMD Serono, Inc.	2	$28
Jazz Pharmaceuticals Inc.	1	$28
AMAG Pharmaceuticals, Inc.	1	$25
Morphosys, US Inc.	1	$25
Taiho Oncology, Inc.	1	$24
Philips North America LLC	1	$23
Beone Medicines USA, Inc.	1	$22
AbbVie	1	$21
Mylan Institutional Inc.	1	$21
Epizyme, Inc.	1	$21
Regeneron Healthcare Solutions, Inc.	1	$19
Servier Pharmaceuticals LLC	1	$19
Blueprint Medicines Corporation	1	$17
Emmaus Medical, Inc.	1	$17
CSL Behring	1	$17
Octapharma USA, Inc.	1	$15
Deciphera Pharmaceuticals Inc.	1	$15
Kyowa Kirin, Inc.	1	$14
Chiesi USA, 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.

VANFLYTa$650
IMFINZI$525
Truqap$525

How this compares

$7,278 in reported general payments places this provider in the 60th percentile of 1,363 hematology & oncology providers in California.

See all hematology & oncology providers in California →

Other hematology & oncology in Riverside

Dennis SlamonLos Angeles$3.1M
Sandra HorningStanford$2.5M
Mohammadbagher ZiariCorona$2.5M
George YaghmourLos Angeles$1.9M
Robert VescioWest Hollywood$1.1M
Kevin KellyLos Angeles$894K
Johnny ChangEncino$884K
Nitin RohatgiSacramento$814K
Omid HamidSanta Monica$809K
Catherine CoombsOrange$786K

See the full list for California →

Where these figures come from

Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
Identity: NPPES NPI Registry, July 2026.

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