Siwen Hu-Lieskovan, MD
Internal Medicine · Los Angeles, CANPI 1578864864
Payments from drug & device makers
Across 278 payments — averaging $10,582 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$1.2M
- E.r. Squibb & Sons, L.L.C.$396K
- Boehringer Ingelheim$359K
- Regeneron$323K
- Pfizer$283K
- Immunocore Limited$174K
- plus $163K from 10 others
Across 7 payments — averaging $1857.60 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$13K
- Regeneron$443
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 |
|---|---|---|
| Merck | 36 | $1,243,074 |
| E.r. Squibb & Sons, L.L.C. | 7 | $395,966 |
| Boehringer Ingelheim | 4 | $358,838 |
| Regeneron | 96 | $323,074 |
| Pfizer | 15 | $283,107 |
| Immunocore Limited | 60 | $174,203 |
| Gilead | 5 | $76,290 |
| Genentech, Inc. | 10 | $45,239 |
| Amgen | 26 | $26,666 |
| Ascendis Pharma Endocrinology Inc | 6 | $5,909 |
| Astellas Pharma Inc | 1 | $4,960 |
| Boehringer Ingelheim Pharma GmbH & Co.kg | 8 | $2,936 |
| Delcath Systems | 1 | $1,050 |
| Pharmacyclics LLC, An Abbvie Company | 1 | $125 |
| Biontech SE | 1 | $118 |
| Taiho Oncology, Inc. | 1 | $118 |
How this compares
$2,941,672 in reported general payments places this provider in the 95th percentile of 13,581 internal medicine 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 internal medicine in Los Angeles
- William TownerLos Angeles$27.4M
- Herbert EradatLos Angeles$11.6M
- Deborah WongLos Angeles$10.7M
- Robin KelleyLos Angeles$5.8M
- David GuzmanLos Angeles$4.3M
- Andrew ChengSouth San Francisco$55.1M
- Joel NeutelTustin$34.9M
- Donald BrandonSan Diego$34M
- Rahul AggarwalSan Francisco$24M
- Masoud AzizadNorthridge$21.1M
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.