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135 healthcare data breaches have been reported in California, affecting 36,290,815 patients. Review breach details, understand your rights, and learn how to protect your medical information.
If your provider is listed here, you should have received a breach notification letter under HIPAA. Monitor your Explanation of Benefits statements for unauthorized claims, place a fraud alert on your credit, and consider requesting a copy of your medical records to verify accuracy. You can file a complaint with HHS if you did not receive required notification.
| Organization | Date | Type | Affected | Severity |
|---|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 2024-04-12 | Unauthorized Access/Disclosure | 13,400,000 | critical |
| Episource, LLC | 2025-06-06 | Hacking/IT Incident | 6,725,572 | critical |
| Blue Shield of California | 2025-04-09 | Hacking/IT Incident | 4,700,000 | critical |
| Regal Medical Group,Lakeside Medical Organization, ADOC Acquisition, & Greater Covina Medical Group | 2023-02-01 | Hacking/IT Incident | 3,388,856 | critical |
| Postmeds, Inc. | 2023-10-30 | Hacking/IT Incident | 2,364,359 | critical |
Hacking/IT Incident · 650 affected
Hacking/IT Incident · 3,579 affected
Hacking/IT Incident · 9,912 affected
Hacking/IT Incident · 1,487 affected
Hacking/IT Incident · 6,633 affected
Hacking/IT Incident · 1,800 affected
Hacking/IT Incident · 521 affected
Hacking/IT Incident · 4,309 affected
Hacking/IT Incident · 3,538 affected
Hacking/IT Incident · 4,035 affected
Under HIPAA, healthcare organizations in California must notify you within 60 days if your protected health information (PHI) has been compromised in a data breach affecting 500 or more individuals.
California has state-level breach notification laws that may provide additional protections beyond federal HIPAA requirements. You have the right to:
California Medical Records Guide
Know your rights to access and correct your records
Request Your Medical Records
Order copies to verify accuracy after a breach
Search our database to see if your healthcare provider in California was involved in a breach.
As of our latest data, 135 healthcare data breaches have been reported in California, affecting a total of 36,290,815 patients. The most common type is Hacking/IT Incident.
If your healthcare data was compromised in California, you should: (1) review the breach notification letter for details, (2) request a copy of your medical records to check for unauthorized changes, (3) place a fraud alert on your credit reports, (4) file a complaint with the HHS Office for Civil Rights or the California Attorney General's office, and (5) consider consulting an attorney about potential compensation.
Yes, California has state-level breach notification laws that may provide additional protections beyond federal HIPAA requirements. These laws may cover different types of personal information, have different notification timelines, and provide additional enforcement mechanisms through the California Attorney General's office.
Disclaimer: This page provides educational information about healthcare data breaches in California. It is not legal advice. Data is sourced from the HHS OCR Breach Portal and may not reflect the most current information. Consult a qualified attorney for specific legal questions about a data breach affecting you.