Chien Chen
Radiation Oncology · la Jolla, CANPI 1083947717
Payments from drug & device makers
Across 13 payments — averaging $98.12 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Brainlab, Inc.$1K
- Johnson & Johnson$128
- Eisai Inc.$42
- Daiichi Sankyo Inc.$24
- EMD Serono, Inc.$18
- E.r. Squibb & Sons, L.L.C.$15
- plus $14 from 1 others
What the payments were for
- Travel & lodging$83966%
- Food & beverage$43734%
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 |
|---|---|---|
| Brainlab, Inc. | 3 | $1,035 |
| Johnson & Johnson | 4 | $128 |
| Eisai Inc. | 2 | $42 |
| Daiichi Sankyo Inc. | 1 | $24 |
| EMD Serono, Inc. | 1 | $18 |
| E.r. Squibb & Sons, L.L.C. | 1 | $15 |
| Bard Peripheral Vascular, Inc. | 1 | $14 |
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.
- Brainlab, Inc.$939
How this compares
$1,276 in reported general payments places this provider in the 60th percentile of 627 radiation oncology 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 |
|---|---|---|
| Methylprednisolone | 73 | $373 |
| Omeprazole | 11 | $282 |
| Gabapentin | 13 | $221 |
| Tamsulosin Hcl | 17 | $133 |
| Dexamethasone | 13 | $122 |
Paid to pharmacies, not to this prescriber.
Other radiation oncology in la Jolla
- Loren Mellla Jolla$10M
- Hyun KimDuarte$6M
- Megan DalyOrange$4.5M
- Percy LeeIrvine$2.4M
- Felix FengSan Francisco$1.8M
- Jeffrey WongDuarte$1.7M
- Arta MonjazebSacramento$1.5M
- Rakesh PatelLos Gatos$1.3M
- Maximilian DiehnStanford$1.2M
- Rizwan NuraniApple Valley$1.1M
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.