Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Quest Diagnostics

Disclosed Nov 16, 20215,325 affectedConfirmed

Official notice

What is known

People affected5,325 (as reported by the organization)
DisclosedNov 16, 2021
HappenedOct 29, 2021
AttackNot stated
Data exposedNot stated
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Quest Diagnostics
Official noticein.gov
Indiana Attorney General 2021 data breach report: Quest Diagnostics

Notices filed

Residents of CANov 16, 2021
California AGCount not stated
Residents of INNov 16, 2021
Indiana AG193 people

Other breaches at Quest Diagnostics

Cybersecurity incident disclosed to the SEC (8-K Item 8.01)Cybersecurity incident disclosed to the SEC (8-K Item 8.01)HackingHealthcareUSOct 22Insider breachInsider exposed names and health records. Reported to the HHS archive.1,062 affectedHealthcareUSOct 25, 2024Billing vendor AMCA breach exposes data of 11.9 million Quest patientsVendor breach exposed names, financial details, payment cards, health records and Social Security numbers.Vendor breach12M affectedHealthcareUSJun 3, 2019Hacking breachHacking exposed names and health records. Reported to the California AG.34K affectedHealthcareUSDec 12, 2016Breach, details not statedExposed names and Social Security numbers. Reported to the California AG.HealthcareUSDec 19, 2014
History of this record
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 5325by backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Quest Diagnostics