HHS OCR report ยท 2021
Health Net of California data breach
OCR report facts
- Covered entity
- Health Net of California
- Entity type
- Health Plan
- State
- California
- Individuals affected
- 550,828
- Submission date
- Mar 25, 2021
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
The covered entity (CE), Health Net of California, reported that its business associate (BA) experienced a cyber-attack that affected the electronic protected health information (ePHI) of 550,828 individuals. The ePHI involved included names, addresses, dates of birth, health insurance information, diagnoses, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. Following the breach, the CE provided complimentary credit monit...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Health Net of California data breach?
The report to HHS OCR lists 550,828 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Mar 25, 2021.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from Health Net of California legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or Health Net of California.