Has Andy Chang, MD received payments from drug or device companies?

Yes. Drug and device makers reported $2,186 in general payments to Andy Chang, MD across 19 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 Andy Chang, 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 Andy Chang, 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.

Andy Chang, MD

Family Medicine · Fremont, CANPI 1952495137

Payments from drug & device makers

$2,186in general payments, 2019–2025

Across 19 payments — averaging $115.05 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

Gilead$2K
BD$183
Novo Nordisk$161
Boston Scientific$93
Pfizer$54
Dexcom, Inc.$48
plus $87 from 3 others

What the payments were for

Consulting fees$1,72379%
Food & beverage$46321%

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
Gilead	2	$1,561
BD	1	$183
Novo Nordisk	6	$161
Boston Scientific	1	$93
Pfizer	3	$54
Dexcom, Inc.	2	$48
AstraZeneca	2	$42
Exact Sciences	1	$23
Lilly USA, LLC	1	$22

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.

Vemlidy$1,540

How this compares

$2,186 in reported general payments places this provider in the 80th percentile of 10,533 family medicine providers in California.

See all family medicine providers in California →

Medicare billing

Part B allowed, 2024

$90,419

Medicare patients

197

Services billed

702

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
Atorvastatin Calcium	215	$1,238
Rosuvastatin Calcium	40	$850
Valsartan	22	$661
Levothyroxine Sodium	69	$628
Propranolol Hcl	12	$609
Amlodipine Besylate	97	$602
Amlodipine-ValsartanAmlodipine Besylate/Valsartan	14	$468
Doxazosin Mesylate	19	$308
Pioglitazone Hcl	41	$281
Metformin Hcl	69	$273
Losartan Potassium	35	$268
Pantoprazole Sodium	33	$248
Benazepril Hcl	24	$239
Gabapentin	26	$233
Metoprolol Succinate	14	$204

Paid to pharmacies, not to this prescriber.

Other family medicine in Fremont

Sandra WongFremont$892K
Amina HaggagNorthridge$112.8M
Steven ReynoldsLong Beach$53M
Rizwana MohseniLake Forest$26.7M
Daniel JohnsonSan Diego$15.7M
Stacey LayleSan Diego$14.8M
Apinya VutikullirdCypress$14.3M
Hanid AudishSpring Valley$13.6M
Augusto FocilOxnard$12.6M
Jack VuLong Beach$10.1M

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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