Wen-Kai Weng, MD
Hematology & Oncology · Stanford, CANPI 1659428241
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $7,470 of the $8,356 with a category attached, or 89.4%. Gilead accounts for 96.7% of it on its own, with 4 other manufacturers making up the rest. Reporting peaked in 2022 at $6,602 and has fallen 99.7% since, to $19 in 2025.
Across 18 payments — averaging $464.22 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Gilead$8K
- Kyowa Kirin, Inc.$101
- AbbVie$78
- Pfizer$60
- Array Biopharma Inc$37
Across 25 payments — averaging $18,221 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.
- Gilead$456K
What the payments were for
- Consulting fees$7,47089%
- Travel & lodging$4646%
- Food & beverage$4225%
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 |
|---|---|---|
| Gilead(2 entities) | 10 | $8,081 |
| Kyowa Kirin, Inc. | 2 | $101 |
| AbbVie | 1 | $78 |
| Pfizer | 3 | $60 |
| Array Biopharma Inc | 2 | $37 |
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.
How this compares
$8,356 in reported general payments places this provider in the 65th percentile of 1,363 hematology & 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Acyclovir | 31 | $597 |
| Tacrolimus | 17 | $549 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 23 | $223 |
Paid to pharmacies, not to this prescriber.
Other hematology & oncology in Stanford
- Sandra HorningStanford$2.5M
- Dennis SlamonLos Angeles$3.1M
- Mohammadbagher ZiariCorona$2.5M
- George YaghmourLos Angeles$1.9M
- Robert VescioWest Hollywood$1.1M
- Kevin KellyLos Angeles$894K
- Johnny ChangEncino$884K
- Nitin RohatgiSacramento$814K
- Omid HamidSanta Monica$809K
- Catherine CoombsOrange$786K
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.