Has Philip Chatham received payments from drug or device companies?

Yes. Drug and device makers reported $4,345 in general payments to Philip Chatham across 168 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 Philip Chatham 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 Philip Chatham 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.

Philip Chatham

Medical Oncology · San Gabriel, CANPI 1740279264

Payments from drug & device makers

What this record shows

This record is dominated by food and beverage: $3,518 of the $4,345 with a category attached, or 81.0%. It is spread thinly across 43 manufacturers, the largest accounting for just 18.7% — the pattern of someone who eats at a lot of different presentations. That places this record below the midpoint for medical oncology clinicians in CA, where the typical reported total is $4,042.

$4,345in general payments, 2019–2025

Across 168 payments — averaging $25.87 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Novartis$811
E.r. Squibb & Sons, L.L.C.$355
Eisai Inc.$325
Amgen$243
Incyte Corporation$214
AstraZeneca$187
plus $2K from 37 others

What the payments were for

Food & beverage$3,51881%
Education$3298%
Other$49911%

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
Novartis	20	$811
E.r. Squibb & Sons, L.L.C.	16	$355
Eisai Inc.	18	$325
Amgen	6	$243
Incyte Corporation	7	$214
AstraZeneca(2 entities)	10	$187
Johnson & Johnson	4	$179
Pfizer	10	$125
Seagen Inc.	5	$116
Medtronic	1	$113
Puma Biotechnology, Inc.	5	$106
Merck	5	$101
GSK	4	$92
Takeda Pharmaceuticals U.S.A., Inc.	4	$89
Myovant Sciences Inc.	4	$85
Lilly USA, LLC	3	$84
Pinnacle Biologics, Inc	1	$77
Genentech USA, Inc.	3	$74
Array Biopharma Inc	3	$65
Pharmacyclics LLC, An Abbvie Company	3	$62
Karyopharm Therapeutics Inc.	2	$61
Regeneron Healthcare Solutions, Inc.	2	$60
Sanofi	3	$57
Bayer	3	$57
Exelixis Inc.	2	$54
Rigel Pharmaceuticals, Inc.	2	$52
Blueprint Medicines Corporation	2	$49
Tersera Therapeutics LLC	2	$49
Boehringer Ingelheim	2	$47
Myriad Genetic Laboratories, Inc.	2	$43
Gilead	2	$39
Taiho Oncology, Inc.	1	$32
CTI Biopharma Corp.	1	$27
Alnylam Pharmaceuticals Inc.	1	$26
Tolmar Pharmaceuticals, Inc.	1	$24
Daiichi Sankyo Inc.	1	$24
Astellas Pharma US Inc	1	$24
Mylan Institutional Inc.	1	$23
GE HealthCare	1	$22
Ipsen Biopharmaceuticals, Inc	1	$22
EMD Serono, Inc.	1	$20
Deciphera Pharmaceuticals Inc.	1	$18
Optos, Inc.	1	$14

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.

KYPHON Balloon Kyphoplasty$113

How this compares

$4,345 in reported general payments places this provider in the 50th percentile of 379 medical oncology providers in California.

See all medical oncology providers in California →

Other medical oncology in San Gabriel

Stephen SherwinSan Francisco$6.9M
Noam DrazinBeverly Hills$1.4M
Farshid DayyaniOrange$1.2M
April TeitelbaumSan Diego$1.1M
Przemyslaw TwardowskiSanta Monica$995K
Ann LowePalo Alto$923K
Marin XavierSan Diego$919K
Munveer Bhangoola Jolla$804K
Stephen LiuLos Angeles$750K
Jacek PinskiLos Angeles$672K

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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