Regulator-posted notice

Breach notice filed by California Physicians’ Service d/b/a Blue Shield of California (November 2023)

Organization named: California Physicians’ Service d/b/a Blue Shield of California 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 Nov. 17, 2023.

Organization as reported: California Physicians’ Service d/b/a Blue Shield of California, CA
Entity type as reported: Health Plan
Category as reported: Hacking/IT Incident
Location of information as reported: Network Server
Submission date: Nov. 17, 2023
Observed by BreachRecords: 2026-10-18 16:15 UTC (revision 10342, row:1481)
Archived copy: Held in the private archive (provenance)

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

Figures, per source

636,849 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date Nov. 17, 2023, 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.

2023-11-17Submission date (HHS Office for Civil Rights breach portal)
2026-10-18Observed by BreachRecords (revision 10342)
2026-10-19Approved by a reviewer

Organizations linked by a reviewer

California Physicians’ Service d/b/a Blue Shield of California 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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