Andrew Chang, MD
Radiation Oncology · San Diego, CANPI 1255513859
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $5,866 of the $8,260 with a category attached, or 71.0%. Varian Medical Systems, Inc. accounts for 71.0% of it on its own, with 11 other manufacturers making up the rest. Reporting peaked in 2019 at $5,970 and has fallen 96.7% since, to $197 in 2025.
Across 20 payments — averaging $413.00 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Varian Medical Systems, Inc.$6K
- Icad, Inc$2K
- Siemens Medical Solutions USA, Inc.$200
- Boston Scientific$157
- Teleflex LLC$115
- Mevion_medical_systems_inc$104
- plus $172 from 6 others
What the payments were for
- Travel & lodging$5,86671%
- Food & beverage$2,39429%
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 |
|---|---|---|
| Varian Medical Systems, Inc. | 2 | $5,866 |
| Icad, Inc | 2 | $1,646 |
| Siemens Medical Solutions USA, Inc. | 2 | $200 |
| Boston Scientific | 3 | $157 |
| Teleflex LLC | 1 | $115 |
| Mevion_medical_systems_inc | 3 | $104 |
| Elekta, Inc. | 1 | $66 |
| Progenics Pharmaceuticals, Inc. | 2 | $44 |
| Astellas Pharma US Inc | 1 | $17 |
| Novartis | 1 | $16 |
| Myovant Sciences Inc. | 1 | $15 |
| AbbVie | 1 | $13 |
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.
- ProBeam$5,266
- AXXENT SURFACE CONTROLLER$1,646
- Proton System$600
- GENERAL - THERAPIES$103
How this compares
$8,260 in reported general payments places this provider in the 85th 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 San Diego
- Jyoti MayadevSan Diego$170K
- Todd AguileraSan Diego$45K
- Donald FullerSan Diego$34K
- Bradley PrestidgeSan Diego$22K
- Andrew SharabiSan Diego$21K
- Tyler SeibertSan Diego$21K
- Parag SanghviSan Diego$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.