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47 disclosed this week · 26,367 on record

Blue Shield of California

Disclosed Jan 14, 201620,764 affectedConfirmed

Official notice

On December 7, 2015, Blue Shield of California, the covered entity (CE), discovered that its servers were breached via social engineering at its call centers in Costa Rica. The breach affected 20,764 patients’ protected health information (PHI). The types of PHI involved included patients’ names, addresses, dates of births, and social security numbers. The CE provided breach notification to HHS, affected individuals, the media. In response to the breach, the CE disabled all existing login credentials and manually distributed new passwords. It trained all call center workforce members about the risks of social engineering and implemented two-factor authentication for external access to its network via its virtual private network (VPN). The CE also provided OCR with additional documentation as relevant to the breach investigation, including its HIPAA Notice of Privacy Practices Policy. OCR obtained assurances that the CE implemented the corrective actions listed above.

What is known

People affected20,764 (as reported to HHS)
DisclosedJan 14, 2016
HappenedSep 15, 2015
AttackInsider
Data exposedNamesHealth
SectorInsurance · US
StatusConfirmed

Sources

Notices filed

Other breaches at Blue Shield of California

History of this record
sector2026-09-25
other to insuranceby 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 20764by backfillSource
summary2026-09-25
empty to On December 7, 2015, Blue Shield of California, the covered entity (CE), discovered that its servers were breached via social engineering at its call centers in Costa Rica. The breach affected 20,764 patients’ protected health information (by 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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