Dennis Slamon, MD
Hematology & Oncology · Los Angeles, CANPI 1932129533
Payments from drug & device makers
Across 117 payments — averaging $29,688 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Biomarin Pharmaceutical Inc.$3M
- Pfizer$314K
- Novartis$94K
- AstraZeneca$39K
- F. Hoffmann-la Roche AG$5K
- Novartis Pharma AG$3K
- plus $1K from 6 others
Across 28 payments — averaging $1597.27 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$18K
- Novartis$16K
- F. Hoffmann-la Roche AG$7K
- Novartis Pharma AG$3K
- Seagen Inc.$60
What the payments were for
- Consulting fees$436,33014%
- Speaking & faculty fees$2,651,63085%
- Travel & lodging$16,3091%
- Food & beverage$2,4240%
- Gifts$6220%
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 |
|---|---|---|
| Biomarin Pharmaceutical Inc. | 39 | $3,016,562 |
| Pfizer(2 entities) | 32 | $313,920 |
| Novartis | 29 | $94,302 |
| AstraZeneca | 1 | $39,250 |
| F. Hoffmann-la Roche AG | 5 | $4,731 |
| Novartis Pharma AG | 1 | $3,375 |
| Astrazeneca UK Limited | 1 | $685 |
| Gilead | 4 | $335 |
| Daiichi Sankyo Inc. | 2 | $203 |
| Leica Microsystems Inc. | 1 | $40 |
| Genentech, Inc. | 1 | $31 |
| Tesaro, Inc. | 1 | $19 |
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
$3,473,453 in reported general payments places this provider in the 95th 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.
Other hematology & oncology in Los Angeles
- David BerzLos Angeles$43.3M
- Nicholas McAndrewLos Angeles$22.9M
- Antoni RibasLos Angeles$13M
- Gary SchillerLos Angeles$11.9M
- Matthew RettigLos Angeles$8.2M
- Lasika SeneviratneLos Angeles$8.1M
- Gary BuchschacherLos Angeles$7.9M
- Edward GaronLos Angeles$7.9M
- Gottfried KonecnyLos Angeles$7.6M
- Sven de VosLos Angeles$6.7M
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.