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California Physicians' Service

Disclosed Nov 17, 20232 years ago636,849 affectedConfirmed

Official notice

California Physicians’ Service dba Blue Shield of California, the covered entity (CE), reported that its business associate (BA) experienced a cyber-attack that compromised the protected health information (PHI) of 636,849 individuals. The PHI involved included names, Social Security numbers, diagnoses, addresses, birthdates, and claims information. In its mitigation efforts, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards.

What is known

People affected636,849 (as reported to HHS)
DisclosedNov 17, 2023
AttackHacking
Data exposedNames, Health
SectorInsurance · US
StatusConfirmed

Sources

Source
HHS OCR breach report (archive, resolved): California Physicians' Service (Health Plan, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
HHS archivetotalNov 17, 2023636,849

Other breaches at California Physicians' Service

BreachAffected
Disclosed Apr 13, 2018Apr 13, 20188 years agoHacking18K
Disclosed Jun 5, 2015Jun 5, 201511 years agoInsider843
History of this record
  • 2026-09-25 · added · backfill source

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

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