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Adventist Health Simi Valley

Disclosed Dec 6, 201954,708 affectedConfirmed

Official notice

The covered entity (CE), Adventist Health Simi Valley, reported that an employee was the victim of an email phishing attack that compromised the protected health information (PHI) of 54,708 individuals. The PHI involved included names, addresses, dates of birth, health insurance information, and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE provided complimentary credit monitoring services and implemented additional technical safeguards, revised its policies and procedures, and retrained its employees on email security. OCR provided the CE with technical assistance.

What is known

People affected54,708 (as reported to HHS)
DisclosedDec 6, 2019
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
Added2026-09-25
First recordedby backfillSource

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

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