Ralph Weichselbaum
Radiation Oncology · Chicago, ILNPI 1578510749
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $9,245 of the $10,520 with a category attached, or 87.9%. EMD Serono, Inc. accounts for 84.6% of it on its own, with 2 other manufacturers making up the rest. Reporting peaked in 2019 at $5,825 and has fallen 83.8% since, to $945 in 2021. Among radiation oncology clinicians in IL with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 8 payments — averaging $1314.94 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- EMD Serono, Inc.$9K
- Boehringer Ingelheim International GmbH$945
- Boehringer Ingelheim$678
Across 16 payments — averaging $38,005 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.
- Regeneron$518K
- Varian Medical Systems, Inc.$90K
Across 25 payments — averaging $1517.01 each. An ownership or investment interest held by the physician or an immediate family member.
- Reflexion Medical, Inc.$38K
What the payments were for
- Consulting fees$9,24588%
- Travel & lodging$1,10511%
- Food & beverage$1702%
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 |
|---|---|---|
| EMD Serono, Inc. | 6 | $8,897 |
| Boehringer Ingelheim International GmbH | 1 | $945 |
| Boehringer Ingelheim | 1 | $678 |
How this compares
$10,520 in reported general payments places this provider in the 90th percentile of 242 radiation oncology providers in Illinois.
Other radiation oncology in Chicago
- Sean PitrodaChicago$103K
- Aditya JulooriChicago$73K
- Steven ChmuraChicago$59K
- William SmallChicago$54K
- Ken TatebeChicago$42K
- Sean SachdevChicago$34K
- Yasmin HasanChicago$18K
- Tarita ThomasChicago$8K
- Gaurav MarwahaChicago$6K
- Dian WangChicago$5K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.