Ruby Chang, MD
Diagnostic Radiology · Walnut Creek, CANPI 1164459335
Payments from drug & device makers
Across 6 payments — averaging $20.24 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Incyte Corporation$38
- Johnson & Johnson$24
- Puma Biotechnology, Inc.$24
- Eisai Inc.$19
- Mayne Pharma Commercial LLC$16
What the payments were for
- Food & beverage$121100%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Incyte Corporation | 2 | $38 |
| Johnson & Johnson | 1 | $24 |
| Puma Biotechnology, Inc. | 1 | $24 |
| Eisai Inc. | 1 | $19 |
| Mayne Pharma Commercial LLC | 1 | $16 |
How this compares
$121 in reported general payments places this provider in the 60th percentile of 3,537 diagnostic radiology 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 diagnostic radiology in Walnut Creek
- Michael WangEscondido$14M
- Murray ReicherSan Diego$10.5M
- Charles PeterfyKentfield$8.1M
- Garry GoldStanford$6M
- Gary UlanerLos Angeles$3.3M
- Jerome BarakosSan Francisco$2.5M
- Armonde BaghdanianLos Angeles$2.1M
- Curtis LanglotzStanford$1.8M
- Albert HsiaoSan Diego$1.6M
- Matthew LungrenSan Francisco$1.6M
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.