Every public data breach

44 disclosed this week · 26,355 on record

Kaiser Foundation Health Plan

Disclosed Aug 31, 20174,389 affectedConfirmed

Official notice

Kaiser Foundation Health Plan (Kaiser), the covered entity (CE), reported that it had impermissibly disclosed protected health information (PHI) due to a flaw in its mail merge and quality assurance process. The breach affected 638 individuals. The PHI involved included names, medications prescribed, and health plan members. Following the breach, Kaiser strengthened its quality assurance process for mail merging and provided training on the revised process as well as refresher HIPAA training on protecting the privacy and security of PHI.

What is known

People affected4,389 (as reported to HHS)
DisclosedAug 31, 2017
HappenedOct 9, 2017
AttackInsider
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Kaiser Foundation Health Plan

History of this record
records2026-09-25
638 to 4389by 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 638by backfillSource
summary2026-09-25
empty to Kaiser Foundation Health Plan (Kaiser), the covered entity (CE), reported that it had impermissibly disclosed protected health information (PHI) due to a flaw in its mail merge and quality assurance process. The breach affected 638 individuby backfillSource
disclosed2026-09-25
2017-12-05 to 2017-08-31by backfillSource
disclosed2026-09-25
2017-12-28 to 2017-12-05by 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.

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