Amy Chien, MD
Medical Oncology · San Francisco, CANPI 1922242932
Payments from drug & device makers
Across 390 payments — averaging $26,818 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Pfizer$4.2M
- Amgen$2.2M
- Merck$1.3M
- Puma Biotechnology, Inc.$824K
- Regeneron$613K
- Seagen Inc.$547K
- plus $707K from 9 others
Across 1 payment — averaging $330.00 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.
- Pfizer$330
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 |
|---|---|---|
| Pfizer | 203 | $4,230,703 |
| Amgen | 11 | $2,247,022 |
| Merck | 19 | $1,290,294 |
| Puma Biotechnology, Inc. | 13 | $824,130 |
| Regeneron | 12 | $613,193 |
| Seagen Inc. | 97 | $547,239 |
| AstraZeneca | 6 | $340,377 |
| Jazz Pharmaceuticals Inc. | 7 | $315,183 |
| Astrazeneca UK Limited | 1 | $26,612 |
| Genentech USA, Inc. | 8 | $12,155 |
| Eli Lilly | 1 | $5,361 |
| Sanofi | 1 | $3,090 |
| Novartis | 2 | $1,888 |
| Gilead | 8 | $1,763 |
| GE HealthCare | 1 | $169 |
How this compares
$10,459,178 in reported general payments places this provider in the 95th percentile of 379 medical 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 medical oncology in San Francisco
- Kevin KimSan Francisco$10.8M
- Stephen SherwinSan Francisco$6.9M
- Chloe AtreyaSan Francisco$5.7M
- Aman ChauhanSan Francisco$5.2M
- Emily BergslandSan Francisco$3.4M
- Bridget KeenanSan Francisco$2.2M
- Sarmad SadeghiLos Angeles$26.1M
- Marwan FakihDuarte$24.2M
- Sumanta PalDuarte$15.9M
- Farshid DayyaniOrange$13.4M
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.