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44 disclosed this week · 26,355 on record

Laboratory Corporation of America Holdings

Disclosed Jul 13, 201910,251,784 affectedConfirmed

Official notice

The covered entity (CE), Laboratory Corporation of America Holdings dba LabCorp, reported that its business associate (BA) Retrieval-Masters Creditors Bureau, Inc. – American Medical Collection Agency (AMCA), was the victim of a cyber-attack involving the protected health information (PHI) of 10,251,784 individuals. The PHI involved included names, addresses, dates of birth, Social Security numbers, phone numbers, health insurance information, and treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. As a result of this breach, LabCorp terminated its business relationship with AMCA.

What is known

People affected10,251,784 (as reported to HHS)
DisclosedJul 13, 2019
DiscoveredMay 14, 2019
HappenedAug 1, 2018
AttackHacking
Data exposedNamesSocial Security numbersPayment cardsFinancialHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Laboratory Corporation of America Holdings

History of this record
data_types2026-09-25
["names","ssn","payment-card","financial"] to ["names","ssn","payment-card","financial","health"]by backfillSource
records_basis2026-09-25
organization to hhsby backfillSource
records2026-09-25
10241756 to 10251784by backfillSource
summary2026-09-25
empty to The covered entity (CE), Laboratory Corporation of America Holdings dba LabCorp, reported that its business associate (BA) Retrieval-Masters Creditors Bureau, Inc. – American Medical Collection Agency (AMCA), was the victim of a cyber-attacby backfillSource
data_types2026-09-25
[] to ["names","ssn","payment-card","financial"]by backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 10241756by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
disclosed2026-09-25
2019-07-15 to 2019-07-13by backfillSource
discovered2026-09-25
empty to 2019-05-14by 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 Laboratory Corporation of America Holdings