Dennis Chan, MD
Radiation Oncology · Maywood, ILNPI 1679005243
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 12 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 8 manufacturers reported payments, led by Siemens Medical Solutions USA, Inc. at 33.3% of the total. Reporting peaked in 2023 at $162 and has fallen 89.2% since, to $18 in 2025.
Across 12 payments — averaging $37.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Siemens Medical Solutions USA, Inc.$148
- Carl Zeiss Meditec USA, Inc.$122
- Novocure Inc.$44
- Viewray Technologies Inc$39
- Novartis$32
- Intuitive Surgical$30
- plus $30 from 2 others
What the payments were for
- Food & beverage$444100%
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 |
|---|---|---|
| Siemens Medical Solutions USA, Inc. | 3 | $148 |
| Carl Zeiss Meditec USA, Inc. | 2 | $122 |
| Novocure Inc. | 2 | $44 |
| Viewray Technologies Inc | 1 | $39 |
| Novartis | 1 | $32 |
| Intuitive Surgical | 1 | $30 |
| Blue Earth Diagnostics | 1 | $19 |
| Boston Scientific | 1 | $11 |
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.
How this compares
$444 in reported general payments places this provider in the 55th percentile of 242 radiation oncology providers in Illinois.
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 |
|---|---|---|
| SsdSilver Sulfadiazine | 14 | $253 |
| Pantoprazole Sodium | 15 | $105 |
| Gabapentin | 11 | $96 |
Paid to pharmacies, not to this prescriber.
Other radiation oncology in Maywood
- Nagendra KoneruMaywood$29K
- Abhishek SolankiMaywood$23K
- Matthew HarkenriderMaywood$13K
- James WelshMaywood$9K
- Bahman EmamiMaywood$3K
- Samar KhanMaywood$1K
- Ramji RajendranElk Grove Village$207K
- Brian BaumannSpringfield$204K
- Tamer RefaatFreeport$151K
- Parthiv MehtaGlenview$149K
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.