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Regulator-posted notice

Breach notice filed by Adventist Health Simi Valley (December 2019)

Organization named: Adventist Health Simi Valley Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Hacking/IT Incident

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS Office for Civil Rights breach portal with a submission date of Dec. 6, 2019.

Organization as reported
Adventist Health Simi Valley, CA
Entity type as reported
Healthcare Provider
Category as reported
Hacking/IT Incident
Location of information as reported
Email
Submission date
Dec. 6, 2019
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 13100, row:4239)
Archived copy
Held in the private archive (provenance)

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.

The source's own words, from the revision above.

Figures, per source

  • 54,708 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date Dec. 6, 2019, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

  • Submission date (HHS Office for Civil Rights breach portal)
  • Observed by BreachRecords (revision 13100)
  • Approved by a reviewer

Organizations linked by a reviewer

  • Adventist Health Simi Valley Named as the covered entity Provisional: identity as filed, not yet matched to the directory Linked 2026-10-19, method provisional.

Archived evidence

  • 3dbc27dd5742e041cc1e7fe18cc669e2901fbd3b86b7007ed27948ff4d406e1f
    text/csv, 5,530,996 bytes, retrieved from HHS Office for Civil Rights breach portal, 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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