- State
- CA
- Covered entity type
- Healthcare Provider
- Individuals affected
- 54,708
- Business associate present
- No
- Type of breach
- Hacking/IT Incident
- Location of breached information
- First seen by InfoSec Signals
- 9/23/2026
- Last seen in OCR export
- 9/23/2026
OCR description
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.
Change history
- 9/23/2026Added to OCR's archive list
Source: HHS OCR Breach Portal, U.S. Department of Health and Human Services, Office for Civil Rights about this source
Records are reproduced as published; entity names and figures are OCR's.