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Blue Shield of California

Disclosed Oct 27, 20214 years ago1,519 affectedConfirmed

Official notice

Blue Shield of California, the covered entity (CE), reported that its business associate (BA) experienced a ransomware attack that compromised the protected health information (PHI) of 1,519 individuals. The PHI involved included names, dates of birth, and Social Security numbers. The CE notified HHS, affected individuals, the media, and provided substitute notice on its website. To mitigate the incident and prevent reoccurrence of a similar incident, the CE provided complimentary credit monitoring services and implemented additional administrative and technical safeguards to better protect sensitive data. OCR provided the CE with technical assistance regarding the importance of training and retraining after a security incident.

What is known

People affected1,519 (as reported to HHS)
DisclosedOct 27, 2021
HappenedAug 25, 2021
AttackHacking
Data exposedNames, Health
SectorInsurance · US
StatusConfirmed

Sources

Source
California Attorney General breach notice: Blue Shield of Californiaoag.ca.gov · Official notice
HHS OCR breach report (archive, resolved): Blue Shield of California (Health Plan, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
California AGresidents of CAOct 27, 2021
HHS archivetotalNov 19, 20211,519

Other breaches at Blue Shield of California

BreachAffected
Google Analytics misconfiguration shared 4.7M members' health dataFeb 28, 20251 year agoExposed data4.7M
Disclosed Jul 12, 2022Jul 12, 20224 years agoHacking1,506
Disclosed Jan 14, 2016Jan 14, 201610 years agoInsider21K
Disclosed Feb 18, 2014Feb 18, 201412 years agoUnknown
History of this record
  • 2026-09-25 · sector: other to insurance · backfill source
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: empty to hhs · backfill source
  • 2026-09-25 · records: empty to 1519 · backfill source
  • 2026-09-25 · summary: empty to Blue Shield of California, the covered entity (CE), reported that its business associate (BA) experienced a ransomware attack that compromised the protected health information (PHI) of 1,519 individuals. The PHI involved included names, dat · backfill source
  • 2026-09-25 · added · backfill source

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

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