Maximilian Diehn
Radiation Oncology · Stanford, CANPI 1174719850
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $64,492 of the $73,216 with a category attached, or 88.1%. 10 manufacturers reported payments, led by AstraZeneca at 36.2% of the total. Reporting peaked in 2021 at $19,187 and has fallen 66.3% since, to $6,465 in 2025. Among radiation oncology clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 48 payments — averaging $1525.33 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$26K
- Regeneron$15K
- Astrazeneca UK Limited$12K
- Genentech, Inc.$10K
- Chugai Pharmaceutical Co., Ltd.$3K
- Boehringer Ingelheim International GmbH$3K
- plus $4K from 4 others
Across 17 payments — averaging $66,412 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$839K
- Varian Medical Systems, Inc.$267K
- Genentech, Inc.$24K
What the payments were for
- Consulting fees$64,49288%
- Speaking & faculty fees$2,0003%
- Travel & lodging$5,7228%
- Food & beverage$1,0011%
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 |
|---|---|---|
| AstraZeneca | 17 | $26,484 |
| Regeneron | 15 | $15,251 |
| Astrazeneca UK Limited | 6 | $11,976 |
| Genentech, Inc. | 3 | $9,570 |
| Chugai Pharmaceutical Co., Ltd. | 1 | $3,280 |
| Boehringer Ingelheim International GmbH | 1 | $2,835 |
| Roche Sequencing Solutions, Inc. | 1 | $2,000 |
| Novartis | 1 | $1,641 |
| Varian Medical Systems, Inc. | 2 | $119 |
| Gilead | 1 | $59 |
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
$73,216 in reported general payments places this provider in the 95th 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.
Other radiation oncology in Stanford
- Yushen QianStanford$47K
- Anusha KalbasiStanford$37K
- Rishabh ChaudhariStanford$35K
- Quynh-Thu leStanford$23K
- Scott SoltysStanford$19K
- Noah Kastelowitz-LiebermanStanford$17K
- Billy LooStanford$11K
- Rakesh PatelLos Gatos$1.3M
- Amir LavafPalm Springs$411K
- Albert ChangLos Angeles$290K
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.