Daniel Chang, MD
Radiation Oncology · Ann Arbor, MINPI 1285722892
Payments from drug & device makers
What this record shows
The money is spread across several categories — travel and lodging (47.0%), consulting fees and speaking fees — rather than concentrated in one kind of arrangement. Siemens Medical Solutions USA, Inc. accounts for 92.1% of it on its own, with 7 other manufacturers making up the rest. Reporting peaked in 2023 at $24,029 and has fallen 97.5% since, to $611 in 2025. Among radiation oncology clinicians in MI 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 59 payments — averaging $636.80 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Siemens Medical Solutions USA, Inc.$35K
- Reflexion Medical, Inc.$1K
- Mentor Worldwide LLC$1K
- Viewray Technologies Inc$246
- Varian Medical Systems, Inc.$97
- Axogen$91
- plus $93 from 2 others
Across 28 payments — averaging $31,549 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.
- Reflexion Medical, Inc.$575K
- Viewray Technologies Inc$222K
- Varian Medical Systems, Inc.$62K
- Siemens Medical Solutions USA, Inc.$25K
What the payments were for
- Consulting fees$12,25733%
- Speaking & faculty fees$5,60015%
- Travel & lodging$17,66447%
- Food & beverage$2,0505%
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. | 31 | $34,615 |
| Reflexion Medical, Inc. | 3 | $1,350 |
| Mentor Worldwide LLC | 17 | $1,080 |
| Viewray Technologies Inc | 4 | $246 |
| Varian Medical Systems, Inc. | 1 | $97 |
| Axogen | 1 | $91 |
| Novocure Inc. | 1 | $54 |
| Mevion_medical_systems_inc | 1 | $39 |
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.
- Varian Treatment$12,893
- TrueBeam$5,357
- Edge$2,583
- REFLEXION MEDICAL RADIOTHERAPY SYSTEM$1,275
- Halcyon$1,135
- MENTOR MemoryGel Resterilizable Gel Sizer$664
- MRIdian LINAC$131
- Clinac iX$103
How this compares
$37,571 in reported general payments places this provider in the 95th percentile of 198 radiation oncology providers in Michigan.
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 Ann Arbor
- Daniel WahlAnn Arbor$42K
- Shruti JollyAnn Arbor$30K
- James KaneAnn Arbor$19K
- Theodore LawrenceAnn Arbor$12K
- Michelle MierzwaAnn Arbor$2K
- Michelle KimAnn Arbor$2K
- Michael GreenAnn Arbor$2K
- Sean MillerAnn Arbor$1K
- Frank ViciniPontiac$231K
- Thomas BoikeClarkston$171K
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.