Arash Rezazadeh Kalebasty, MD
Hematology & Oncology · Orange, CANPI 1205974755
Payments from drug & device makers
Across 905 payments — averaging $9607.50 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$2.3M
- Novartis$2M
- AstraZeneca$945K
- E.r. Squibb & Sons, L.L.C.$570K
- Amgen$476K
- Exelixis Inc.$444K
- plus $1.9M from 28 others
Across 11 payments — averaging $4904.53 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.
- E.r. Squibb & Sons, L.L.C.$43K
- Novartis$9K
- F. Hoffmann-la Roche AG$1K
- Eli Lilly$922
What the payments were for
- Consulting fees$73,60814%
- Speaking & faculty fees$375,38273%
- Travel & lodging$49,50610%
- Food & beverage$11,8332%
- Education$5,1441%
- Entertainment$2580%
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 | 55 | $2,335,015 |
| Novartis | 9 | $2,039,310 |
| AstraZeneca | 38 | $944,619 |
| E.r. Squibb & Sons, L.L.C. | 52 | $570,365 |
| Amgen | 14 | $476,355 |
| Exelixis Inc. | 184 | $443,657 |
| Janssen Research & Development, LLC | 116 | $334,843 |
| Astrazeneca UK Limited | 5 | $262,024 |
| Genentech, Inc. | 41 | $246,688 |
| Pfizer | 44 | $233,521 |
| Bayer | 52 | $192,383 |
| Eli Lilly | 3 | $174,966 |
| Johnson & Johnson | 124 | $100,640 |
| Astellas Pharma Global Development | 6 | $56,620 |
| Eisai Inc. | 54 | $54,736 |
| Seagen Inc. | 9 | $41,632 |
| EMD Serono, Inc. | 30 | $41,130 |
| Clovis Oncology, Inc. | 8 | $28,674 |
| Daiichi Sankyo Inc. | 1 | $23,408 |
| Roche Products Limited | 1 | $21,580 |
| Mirati Therapeutics, Inc. | 7 | $20,504 |
| Sumitomo Pharma America, Inc. | 2 | $13,488 |
| Sanofi | 7 | $10,421 |
| Astellas Pharma US Inc | 11 | $7,367 |
| AVEO Pharmaceuticals, Inc. | 12 | $5,554 |
| F. Hoffmann-la Roche AG | 8 | $5,390 |
| Gilead(2 entities) | 3 | $3,244 |
| Immunomedics, Inc. | 1 | $2,475 |
| Janssen Global Services, LLC | 1 | $1,925 |
| Myovant Sciences Inc. | 1 | $1,280 |
| Bristol Myers Squibb | 1 | $600 |
| Telix Pharmaceuticals | 2 | $195 |
| Genentech USA, Inc. | 2 | $162 |
| Rigel Pharmaceuticals, 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
$8,694,788 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| NubeqaDarolutamide | 249 | $3,330,286 |
| ErleadaApalutamide | 53 | $798,935 |
| OrgovyxRelugolix | 302 | $796,801 |
| CabometyxCabozantinib S-Malate | 31 | $647,480 |
| Abiraterone Acetate | 222 | $458,580 |
| InlytaAxitinib | 23 | $455,770 |
| ZytigaAbiraterone Acetate | 25 | $271,347 |
| XtandiEnzalutamide | 11 | $144,283 |
| EliquisApixaban | 13 | $7,427 |
| Prednisone | 232 | $945 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 24 | $327 |
| Klor-Con 10Potassium Chloride | 14 | $324 |
| Pantoprazole Sodium | 30 | $305 |
| Potassium Chloride | 36 | $282 |
| Olanzapine | 24 | $265 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| BayerNubeqa | $192,383 | $3,330,286249 claims |
| Johnson & JohnsonErleada, Zytiga | $100,640 | $1,070,28278 claims |
| Sumitomo Pharma America, Inc.Orgovyx | $13,488 | $796,801302 claims |
| Exelixis Inc.Cabometyx | $443,657 | $647,48031 claims |
| PfizerInlyta, Eliquis | $233,521 | $463,19736 claims |
| Astellas Pharma US IncXtandi | $7,367 | $144,28311 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 95th percentile of 1,363 hematology & oncology providers in California.
Other hematology & oncology in Orange
- Nataliya MarOrange$10.4M
- Deepa JeyakumarOrange$10.4M
- Misako NagasakaOrange$7.4M
- Sai Hong OuOrange$6.8M
- Catherine CoombsOrange$4.9M
- Ritesh ParajuliOrange$3.7M
- Alain AlgaziSan Francisco$119.2M
- David BerzLos Angeles$43.3M
- Jonathan GoldmanSanta Monica$35.7M
- Omid HamidSanta Monica$23.7M
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.