Samuel Klempner, MD
Hematology & Oncology · Los Angeles, CANPI 1134329378
Payments from drug & device makers
Across 286 payments — averaging $3704.17 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$325K
- AstraZeneca$218K
- Incyte Corporation$211K
- Macrogenics, Inc.$74K
- Regeneron$35K
- Sanofi US Services Inc.$32K
- plus $164K from 27 others
Across 3 payments — averaging $1833.38 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$5K
- Amgen$900
What the payments were for
- Consulting fees$144,54471%
- Speaking & faculty fees$42,20921%
- Travel & lodging$15,3798%
- Food & beverage$2,3401%
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 | 41 | $325,178 |
| AstraZeneca | 18 | $217,579 |
| Incyte Corporation | 90 | $211,079 |
| Macrogenics, Inc. | 23 | $73,986 |
| Regeneron | 10 | $34,802 |
| Sanofi US Services Inc. | 4 | $32,287 |
| GSK | 3 | $25,919 |
| Lilly USA, LLC | 11 | $16,583 |
| Astellas Pharma US Inc | 7 | $16,415 |
| Foundation Medicine, Inc. | 12 | $14,380 |
| Astrazeneca UK Limited | 6 | $13,198 |
| Novartis | 4 | $12,730 |
| E.r. Squibb & Sons, L.L.C. | 12 | $7,808 |
| Eli Lilly | 2 | $6,050 |
| Astellas Pharma Europe Ltd | 5 | $5,989 |
| Eisai Inc. | 2 | $4,774 |
| Amgen | 7 | $4,603 |
| Astellas Pharma Global Development | 4 | $4,583 |
| AbbVie | 2 | $4,537 |
| Daiichi Sankyo Inc. | 4 | $3,970 |
| Sanofi | 4 | $3,872 |
| Servier Bioinnovation | 2 | $3,740 |
| Beigene USA, Inc. | 1 | $3,375 |
| Gilead | 3 | $2,986 |
| Boehringer Ingelheim International GmbH | 1 | $2,960 |
| F. Hoffmann-la Roche AG | 1 | $2,280 |
| Taiho Oncology, Inc. | 1 | $1,320 |
| Coherus Oncology, Inc. | 1 | $900 |
| Jazz Pharmaceuticals Inc. | 1 | $837 |
| Astellas Pharma Inc | 1 | $488 |
| Seagen Inc. | 1 | $95 |
| Genentech, Inc. | 1 | $62 |
| Beone Medicines USA, Inc. | 1 | $29 |
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.
- KEYTRUDA$19,239
- FOUNDATIONFOCUS$14,257
- FOUNDATIONONE CDX$14,257
- FOUNDATIONONE HEME$14,257
- FOUNDATIONONE$14,257
- Vyloy$9,660
- FOUNDATIONACT$8,757
- IMFINZI$8,470
- FOUNDATIONONE LIQUID$5,500
- CYRAMZA$5,449
- LENVIMA$4,740
- ASPARLAS$3,740
- Enhertu$3,425
- TEVIMBRA$3,375
- OPDIVO$2,400
- TECENTRIQ$2,280
- LYTGOBI$1,320
- ZIIHERA$837
How this compares
$1,059,394 in reported general payments places this provider in the 85th 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 |
|---|---|---|
| EliquisApixaban | 16 | $9,606 |
| Omeprazole | 20 | $310 |
| Dexamethasone | 13 | $138 |
| Oxycodone Hcl | 12 | $95 |
| Prochlorperazine Maleate | 12 | $91 |
| Prednisone | 15 | $35 |
| Ondansetron Hcl | 11 | $15 |
Paid to pharmacies, not to this prescriber.
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.