Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Quest Diagnostics

Disclosed Dec 19, 2014Confirmed

Official notice

What is known

People affectedNot stated in the sources we have
DisclosedDec 19, 2014
HappenedNov 17, 2014
AttackNot stated
Data exposedNamesSocial Security numbers
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Quest Diagnostics
Official noticemaine.gov
Maine Attorney General breach notice archive: Quest Diagnostics

Notices filed

Residents of CADec 19, 2014
California AGCount not stated
Residents of MEDec 19, 2014
Maine AG6 people
Residents of MEAug 3, 2015
Maine AG1 person

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, 2024Breach, details not statedBreach notice filed with the California AG, details not stated.5,325 affectedHealthcareUSNov 16, 2021Billing 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, 2016
History of this record
data_types2026-09-25
[] to ["names","ssn"]by 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