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Quest Diagnostics

Disclosed Nov 16, 20214 years ago5,325 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

Source
California Attorney General breach notice: Quest Diagnosticsoag.ca.gov · Official notice
Indiana Attorney General 2021 data breach report: Quest Diagnosticsin.gov · Official notice

Notices filed

WhereFiledPeople
California AGresidents of CANov 16, 2021
Indiana AGresidents of INNov 16, 2021193

Other breaches at Quest Diagnostics

BreachAffected
Disclosed Oct 25, 2024Oct 25, 20241 year agoInsider1,062
Billing vendor AMCA breach exposes data of 11.9 million Quest patientsJun 3, 20197 years agoVendor breach12M
Disclosed Dec 12, 2016Dec 12, 20169 years agoHacking34K
Disclosed Dec 19, 2014Dec 19, 201411 years agoUnknown
History of this record
  • 2026-09-25 · records_basis: empty to organization · backfill source
  • 2026-09-25 · records: empty to 5325 · backfill source
  • 2026-09-25 · added · backfill source

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

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