Has Warren Chin, MD received payments from drug or device companies?

Yes. Drug and device makers reported $2,486 in general payments to Warren Chin, MD across 136 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 Warren Chin, 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 Warren Chin, 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.

Warren Chin, MD

Physical Medicine & Rehabilitation · Santa Rosa, CANPI 1740390681

Payments from drug & device makers

$2,486in general payments, 2019–2025

Across 136 payments — averaging $18.28 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

AbbVie$806
Collegium Pharmaceutical, Inc.$512
Teva Pharmaceuticals USA, Inc.$189
Vertex$161
Avanir Pharmaceuticals, Inc.$149
Biodelivery Sciences International, Inc.$121
plus $547 from 14 others

What the payments were for

Food & beverage$2,42297%
Education$633%

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
AbbVie	38	$806
Collegium Pharmaceutical, Inc.	46	$512
Teva Pharmaceuticals USA, Inc.	7	$189
Vertex	3	$161
Avanir Pharmaceuticals, Inc.	7	$149
Biodelivery Sciences International, Inc.	7	$121
Otsuka America Pharmaceutical, Inc.	5	$103
Pfizer	5	$76
Amgen	2	$53
Biohaven Pharmaceuticals, Inc.	2	$49
Electronic Waveform Lab, Inc.	2	$44
Assertio Therapeutics, Inc.	2	$42
GSK	2	$42
Novartis	2	$36
Kaleo, Inc.	1	$21
Daiichi Sankyo Inc.	1	$19
Otsuka Pharmaceutical Development & Commercialization, Inc.	1	$19
Hikma Pharmaceuticals USA	1	$18
Biohaven Pharmaceutical Holding Company Ltd.	1	$14
Zyla Life Sciences, Inc.	1	$11

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.

JOURNAVX$103

How this compares

$2,486 in reported general payments places this provider in the 80th percentile of 830 physical medicine & rehabilitation providers in California.

See all physical medicine & rehabilitation providers in California →

Medicare billing

Part B allowed, 2024

$54,513

Medicare patients

Services billed

391

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
OxycontinOxycodone Hcl	37	$69,317
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen	282	$9,807
Morphine Sulfate ErMorphine Sulfate	140	$8,301
Oxycodone Hcl	249	$6,812
Hydromorphone Hcl	76	$3,021
Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen	72	$2,797
Methadone Hcl	59	$1,044
Gabapentin	118	$896
Duloxetine Hcl	74	$551
Baclofen	63	$460
Pregabalin	32	$404
Tizanidine Hcl	59	$382
Celecoxib	25	$359
Diazepam	50	$341
Zolpidem Tartrate	62	$295

Paid to pharmacies, not to this prescriber.

Other physical medicine & rehabilitation in Santa Rosa

Ziyad AyyoubParamount$1.8M
John ShenFontana$1.3M
Andrew SkalskySan Diego$463K
Nanette JoyceSacramento$237K
Mary OatesSanta Maria$158K
Jeryl WiensFresno$125K
Pratik GandhiAnaheim$122K
Ronald SchillingLong Beach$113K
Kevin BarretteSan Francisco$84K
Jeffrey ChenSan Diego$82K

See the full list for California →

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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