Has Shirish Mahajan received payments from drug or device companies?

Yes. Drug and device makers reported $8,245 in general payments to Shirish Mahajan across 383 transactions between 2019–2025. Most Open Payments records nationally are meals worth under $20; a reported payment is not evidence of wrongdoing.

Does a payment mean Shirish Mahajan did something wrong?

No. Federal law requires drug and device makers to report almost every transfer of value to a physician, including a $14 sandwich at a lunch presentation. Consulting fees, research funding and royalties to device inventors are ordinary, legal parts of medicine. This site reports what was disclosed; it makes no allegation.

Where does this information about Shirish Mahajan come from?

The U.S. Centers for Medicare & Medicaid Services. Payments come from Open Payments, published under the Physician Payments Sunshine Act. Billing and prescribing figures come from the Medicare Physician & Other Practitioners and Part D Prescriber public use files for 2024.

Shirish Mahajan

Hematology & Oncology · Redding, CANPI 1609808856

Payments from drug & device makers

$8,245in general payments, 2019–2025

Across 383 payments — averaging $21.53 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Amgen$1K
Seagen Inc.$757
Johnson & Johnson$668
AstraZeneca$573
Eisai Inc.$559
Merck$548
plus $4K from 38 others

What the payments were for

Food & beverage$7,19987%
Education$1,04613%

Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.

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
Amgen	55	$1,080
Seagen Inc.	23	$757
Johnson & Johnson(2 entities)	43	$668
AstraZeneca(2 entities)	26	$573
Eisai Inc.	15	$559
Merck	29	$548
E.r. Squibb & Sons, L.L.C.	17	$531
Pfizer	38	$436
Astellas Pharma US Inc	15	$425
Genentech USA, Inc.	28	$422
Gilead(2 entities)	13	$399
Novartis	11	$209
Pharmacyclics LLC, An Abbvie Company	7	$154
Sanofi	7	$135
Bristol Myers Squibb	2	$115
Jazz Pharmaceuticals Inc.	5	$112
Daiichi Sankyo Inc.	5	$109
Incyte Corporation	1	$104
Clovis Oncology, Inc.	4	$92
AbbVie	4	$75
Puma Biotechnology, Inc.	3	$59
Regeneron Healthcare Solutions, Inc.	2	$58
Dova Pharmaceuticals	3	$55
Stemline Therapeutics Inc.	2	$49
Blueprint Medicines Corporation	2	$47
Ipsen Biopharmaceuticals, Inc	2	$38
Lilly USA, LLC	2	$36
Beigene USA, Inc.	2	$34
Kyowa Kirin, Inc.	2	$30
Sobi, Inc	1	$29
Takeda Pharmaceuticals U.S.A., Inc.	1	$28
Genmab U.S., Inc.	1	$28
Exelixis Inc.	1	$25
ADC Therapeutics America, Inc.	1	$24
Morphosys, US Inc.	1	$23
Apellis Pharmaceuticals, Inc.	1	$22
Tolmar Pharmaceuticals, Inc.	1	$22
Myovant Sciences Inc.	1	$22
CSL Behring	1	$21
GSK	1	$21
Amneal Pharmaceuticals LLC	1	$19
Shire North American Group Inc	1	$19
Bayer	1	$17
Taiho Oncology, Inc.	1	$16

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

$8,245 in reported general payments places this provider in the 50th percentile of 1,363 hematology & oncology providers in California.

See all hematology & oncology providers in California →

Most prescribed under Part D

Drug	Claims	Cost to plans & patients
Anastrozole	19	$189

Paid to pharmacies, not to this prescriber.

Other hematology & oncology in Redding

Alain AlgaziSan Francisco$119.2M
David BerzLos Angeles$43.3M
Jonathan GoldmanSanta Monica$35.7M
Omid HamidSanta Monica$23.7M
Nicholas McAndrewLos Angeles$22.9M
Aditya BardiaSanta Monica$22.1M
Joseph TuscanoSacramento$20.4M
Zev WainbergSanta Monica$19.3M
Caitlin CostelloSan Diego$16.9M
Rana McKaySan Diego$15.3M

See the full list for California →

Where these figures come from

Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
Identity: NPPES NPI Registry, July 2026.

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