Has Isaac Chambers, MD received payments from drug or device companies?

Yes. Drug and device makers reported $5,825 in general payments to Isaac Chambers, MD across 304 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 Isaac Chambers, MD 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 Isaac Chambers, MD 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.

Isaac Chambers, MD

Hematology & Oncology · Hays, KSNPI 1497168777

Payments from drug & device makers

$5,825in general payments, 2019–2025

Across 304 payments — averaging $19.16 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Pfizer$486
Novartis$458
Bristol Myers Squibb$364
AstraZeneca$343
Johnson & Johnson$281
Gilead$244
plus $4K from 51 others

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
Pfizer	36	$486
Novartis	22	$458
Bristol Myers Squibb	25	$364
AstraZeneca(2 entities)	16	$343
Johnson & Johnson	15	$281
Gilead(2 entities)	12	$244
Astellas Pharma US Inc	5	$223
GSK	12	$221
Takeda Pharmaceuticals U.S.A., Inc.	8	$200
Array Biopharma Inc	14	$184
Tersera Therapeutics LLC	6	$184
E.r. Squibb & Sons, L.L.C.	11	$176
Lilly USA, LLC	8	$157
AbbVie	7	$155
Genentech USA, Inc.	9	$152
Exelixis Inc.	6	$126
Seagen Inc.	7	$124
Sobi, Inc	6	$117
Amgen	5	$113
Merck	5	$105
Puma Biotechnology, Inc.	5	$92
Sumitomo Pharma America, Inc.	4	$84
Novocure Inc.	4	$80
Incyte Corporation	4	$76
Springworks Therapeutics, Inc.	3	$75
Stemline Therapeutics Inc.	4	$71
Eisai Inc.	2	$68
Rigel Pharmaceuticals, Inc.	3	$64
AVEO Pharmaceuticals, Inc.	3	$64
Taiho Oncology, Inc.	3	$56
Mirati Therapeutics, Inc.	3	$50
Genmab U.S., Inc.	2	$45
Syndax Pharmaceuticals, Inc.	2	$42
Servier Pharmaceuticals LLC	2	$41
Apellis Pharmaceuticals, Inc.	2	$38
Pharmacosmos Therapeutics Inc.	2	$34
Sanofi	1	$32
Pharmaessentia USA Corporation	1	$32
Ipsen Biopharmaceuticals, Inc	1	$32
Jazz Pharmaceuticals Inc.	1	$26
Medtronic	1	$23
Tactile Systems Technology Inc	1	$22
Sun Pharmaceutical Industries Inc.	1	$22
Daiichi Sankyo Inc.	1	$21
Geron Corporation	1	$21
Karyopharm Therapeutics Inc.	1	$20
Kyowa Kirin, Inc.	1	$20
Regeneron Healthcare Solutions, Inc.	1	$19
EMD Serono, Inc.	1	$18
Immunocore Limited	1	$18
Legend Biotech USA Inc.	1	$17
Agios Pharmaceuticals, Inc.	1	$17
Caris MPI, Inc.	1	$15
Blueprint Medicines Corporation	1	$15
Beigene USA, Inc.	1	$14
G1 Therapeutics, Inc.	1	$14
Myriad Genetic Laboratories, Inc.	1	$12

How this compares

$5,825 in reported general payments places this provider in the 45th percentile of 97 hematology & oncology providers in Kansas.

See all hematology & oncology providers in Kansas →

Medicare billing

Part B allowed, 2024

$127,165

Medicare patients

464

Services billed

1,698

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 Hays

Anthony AccursoHays$6K
Priyanka SharmaWestwood$18.5M
Anup Kumar Kasi Loknath KumarWestwood$15.3M
Marc HoffmannOverland Park$13.6M
Shaker DakhilWichita$11.2M
Sunil AbhyankarWestwood$5M
Joseph McGuirkKansas City$3.1M
Prakash NeupaneWestwood$2.7M
Joseph StilwillOverland Park$2.7M
Gary DoolittleWestwood$2.6M

See the full list for Kansas →

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.

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