Nataliya Mar, MD
Hematology & Oncology · Orange, CANPI 1922240191
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $107,409 of the $159,653 with a category attached, or 67.3%. 15 manufacturers reported payments, led by Eisai Inc. at 33.1% of the total. 2025 is the largest year on record at $48,958, more than ten times the $842 reported in 2019. Among hematology & oncology clinicians in CA with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 193 payments — averaging $827.22 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Eisai Inc.$53K
- Merck$52K
- Seagen Inc.$22K
- Astellas Pharma US Inc$12K
- AVEO Pharmaceuticals, Inc.$5K
- Exelixis Inc.$5K
- plus $11K from 9 others
Across 588 payments — averaging $17,502 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.
- Seagen Inc.$5.2M
- Merck$2.2M
- Genentech, Inc.$1.1M
- Pharmacyclics LLC, An Abbvie Company$490K
- Astrazeneca UK Limited$379K
- Gilead$288K
- plus $592K from 5 others
What the payments were for
- Consulting fees$33,79521%
- Speaking & faculty fees$107,40967%
- Travel & lodging$11,2237%
- Food & beverage$6,8884%
- Education$1000%
- Entertainment$2390%
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 |
|---|---|---|
| Eisai Inc. | 66 | $52,906 |
| Merck | 40 | $51,919 |
| Seagen Inc. | 27 | $21,639 |
| Astellas Pharma US Inc | 11 | $12,337 |
| AVEO Pharmaceuticals, Inc. | 13 | $4,967 |
| Exelixis Inc. | 9 | $4,859 |
| Astellas Pharma Global Development | 1 | $4,725 |
| EMD Serono, Inc. | 2 | $2,401 |
| Johnson & Johnson | 4 | $1,855 |
| Pfizer | 11 | $809 |
| Foundation Medicine, Inc. | 2 | $600 |
| Gilead | 4 | $441 |
| AstraZeneca | 1 | $122 |
| Janssen Scientific Affairs, LLC | 1 | $46 |
| Clovis Oncology, Inc. | 1 | $28 |
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.
- LENVIMA$52,084
- PADCEV$38,664
- KEYTRUDA$27,541
- LYNPARZA$19,746
- FOTIVDA$4,847
- Cabometyx$4,790
- FOUNDATIONONE LIQUID$600
- FOUNDATIONFOCUS$600
- FOUNDATIONONE CDX$600
- FOUNDATIONONE HEME$600
- FOUNDATIONONE$600
- INLYTA$148
- Trodelvy$124
How this compares
$159,653 in reported general payments places this provider in the 90th 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 |
|---|---|---|
| CabometyxCabozantinib S-Malate | 71 | $1,462,258 |
| WeliregBelzutifan | 49 | $1,368,048 |
| NubeqaDarolutamide | 85 | $1,165,025 |
| LenvimaLenvatinib Mesylate | 27 | $628,445 |
| InlytaAxitinib | 27 | $384,240 |
| LynparzaOlaparib | 12 | $176,309 |
| OrgovyxRelugolix | 29 | $82,285 |
| EliquisApixaban | 72 | $52,307 |
| Abiraterone Acetate | 33 | $23,426 |
| XareltoRivaroxaban | 27 | $18,059 |
| PlenamineParenteral Amino Acid 15% No.6 | 11 | $4,954 |
| Potassium Chloride | 64 | $798 |
| Levothyroxine Sodium | 80 | $732 |
| Diphenoxylate-AtropineDiphenoxylate Hcl/Atropine | 28 | $649 |
| Prednisone | 119 | $598 |
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 |
|---|---|---|
| Exelixis Inc.Cabometyx | $4,859 | $1,462,25871 claims |
| MerckWelireg | $51,919 | $1,368,04849 claims |
| Eisai Inc.Lenvima | $52,906 | $628,44527 claims |
| PfizerInlyta, Eliquis | $809 | $436,54699 claims |
| AstraZenecaLynparza | $122 | $176,30912 claims |
| Janssen Scientific Affairs, LLCAbiraterone Acetate | $46 | $23,42633 claims |
| Johnson & JohnsonXarelto | $1,855 | $18,05927 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 90th percentile of 1,363 hematology & oncology providers in California.
Other hematology & oncology in Orange
- Catherine CoombsOrange$786K
- Arash Rezazadeh KalebastyOrange$516K
- Misako NagasakaOrange$507K
- Elizabeth BremOrange$335K
- May ChoOrange$334K
- Angela FleischmanOrange$255K
- Dennis SlamonLos Angeles$3.1M
- Sandra HorningStanford$2.5M
- Mohammadbagher ZiariCorona$2.5M
- George YaghmourLos Angeles$1.9M
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.