Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

UnitedHealth Group health plan single affiliated covered entity

Disclosed Apr 27, 201019,100 affectedConfirmed

Official notice

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What is known

People affected19,100 (as reported to HHS)
DisclosedApr 27, 2010
HappenedJun 28, 2011
AttackInsider
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: UnitedHealth Group health plan single affiliated covered entity
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): UnitedHealth Group health plan single affiliated covered entity (Health Plan, MN)

Notices filed

TotalApr 27, 2010
HHS archive735 people
TotalJun 4, 2010
HHS archive16,291 people
TotalFeb 1, 2012
HHS archive6,678 people
Residents of CAMar 30, 2012
California AGCount not stated
TotalMay 18, 2012
HHS archive19,100 people

Other breaches at UnitedHealth Group health plan single affiliated covered entity

Hacking breachHacking exposed names and health records. Reported to the HHS archive.21K affectedInsuranceUSMay 8, 2019
History of this record
disclosed2026-09-25
2010-06-04 to 2010-04-27by backfillSource
disclosed2026-09-25
2012-02-01 to 2010-06-04by backfillSource
disclosed2026-09-25
2012-03-30 to 2012-02-01by backfillSource
attack2026-09-25
unknown to insiderby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 19100by backfillSource
summary2026-09-25
empty to \Nby 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 UnitedHealth Group health plan single affiliated covered entity