Peter Chang, MD
Neuroradiology · San Francisco, CANPI 1841530458
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (52.9%), travel and lodging and speaking fees — rather than concentrated in one kind of arrangement. 8 manufacturers reported payments, led by Bayer Healthcare LLC at 52.1% of the total. Reporting peaked in 2023 at $14,704 and has fallen 99.8% since, to $36 in 2025.
Across 31 payments — averaging $901.92 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Bayer Healthcare LLC$15K
- Olea Medical$7K
- Canon Medical Systems USA, Inc.$5K
- Canon Medical Systems Corporation$850
- Atricure, Inc.$461
- Novocure Inc.$338
- plus $120 from 2 others
Across 4 payments — averaging $37,877 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.
- Novocure Inc.$152K
What the payments were for
- Consulting fees$14,78053%
- Speaking & faculty fees$2,85010%
- Grants$730%
- Travel & lodging$9,01732%
- Food & beverage$1,2404%
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 |
|---|---|---|
| Bayer Healthcare LLC | 17 | $14,564 |
| Olea Medical | 1 | $6,950 |
| Canon Medical Systems USA, Inc. | 3 | $4,677 |
| Canon Medical Systems Corporation | 1 | $850 |
| Atricure, Inc. | 3 | $461 |
| Novocure Inc. | 4 | $338 |
| Boston Scientific | 1 | $73 |
| Mentor Worldwide LLC | 1 | $47 |
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.
- Vitrea Software Toshiba Package$2,500
- Vantage Orian$2,000
- Automation Platform$850
- CT SCANNER$177
How this compares
$27,960 in reported general payments places this provider in the 85th percentile of 154 neuroradiology 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 neuroradiology in San Francisco
- Fabio SettecaseSan Francisco$758K
- Daniel CookeSan Francisco$63K
- Matthew AmansSan Francisco$51K
- Steven HettsSan Francisco$49K
- Amanda BakerSan Francisco$32K
- Howard RowleySan Francisco$18K
- Salil SomanSan Francisco$7K
- Victoria VuongSan Francisco$3K
- Christopher DowdSan Francisco$3K
- Aaron BerezMountain View$24.1M
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.