Every public data breach

44 disclosed this week · 26,355 on record

Northwestern Memorial HealthCare

Disclosed Aug 28, 2020201,197 affectedConfirmed

Official notice

The covered entity (CE), Northwestern Memorial HealthCare, reported that its business associate (BA) was the victim of a cyber-attack affecting the protected health information (PHI) of 201,197 individuals. The PHI involved included names, addresses, dates of birth, Social Security numbers, diagnoses, lab results, medications prescribed, and health insurance and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice on its website. The CE also established a call-center and provided credit monitoring and identity protection services for affected individuals. In response to the breach, the CE terminated its business relationship with its BA.

What is known

People affected201,197 (as reported to HHS)
DisclosedAug 28, 2020
HappenedApr 2, 2021
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Northwestern Memorial HealthCare

History of this record
disclosed2026-09-25
2021-06-25 to 2020-08-28by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 201197by backfillSource
summary2026-09-25
empty to The covered entity (CE), Northwestern Memorial HealthCare, reported that its business associate (BA) was the victim of a cyber-attack affecting the protected health information (PHI) of 201,197 individuals. The PHI involved included names, by backfillSource
Added2026-09-25
First recordedby backfillSource

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

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