HHS OCR report · 2023
California Physicians’ Service d/b/a Blue Shield of California data breach
OCR report facts
- Covered entity
- California Physicians’ Service d/b/a Blue Shield of California
- Entity type
- Health Plan
- State
- California
- Individuals affected
- 636,849
- Submission date
- Nov 17, 2023
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
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 se...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the California Physicians’ Service d/b/a Blue Shield of California data breach?
The report to HHS OCR lists 636,849 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Nov 17, 2023.
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 California Physicians’ Service d/b/a Blue Shield 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 California Physicians’ Service d/b/a Blue Shield of California.