Breach intelligence · CA
87 reported healthcare data breach incidents affecting 33.6M individuals. Sourced from 7 federal and community intelligence feeds. Updated nightly.
87
Incidents reported
33.6M
Individuals affected
Other
Top attack vector
Stable
6-month trend
Recent incidents
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
<projected> Projected from news reports · Not yet confirmed by HHS. The California Attorney General is suing 23andMe over a 2023 breach that exposed customer genetic and personal health data.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Reported to HHS OCR.
Most affected entities
#1
2
incidents
523
individuals
#2
2
incidents
2K
individuals
#3
2
incidents
2.0M
individuals
#4
2
incidents
2K
individuals
#5
2
incidents
65K
individuals
Attack vectors
Breakdown of breach types reported across 87 incidents in California. Understanding which vectors dominate helps practices prioritize their security controls.
California compliance requirements
Beyond federal HIPAA requirements, California has its own breach notification law that may impose additional obligations on healthcare practices operating in the state.
Cal. Civ. Code § 1798.29, § 1798.82
Notification deadline
Most expedient time possible
No fixed deadline — but unreasonable delay can result in enforcement action.
Attorney General notification
Required (500+ individuals)
The California Consumer Privacy Act and California Privacy Rights Act impose additional requirements on consumer data, including health-related marketing data not covered by HIPAA.
California's CMIA provides patient privacy protections that exceed HIPAA in several areas, including a private right of action for patients whose medical information is improperly disclosed.
When notifying the AG, California requires a copy of the notification letter sent to affected individuals.
This is a general reference based on current California law. Consult legal counsel for state-specific compliance obligations. Source: Cal. Civ. Code § 1798.29, § 1798.82. Verified April 2026.
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FAQ
Patient Protect tracks 87 reported healthcare data breach incidents in California, affecting approximately 33.6M individuals. Data is sourced from HHS OCR, State Attorney General offices, FTC enforcement, and community intelligence — updated nightly.
The most frequently reported breach vector in California is Other/Unknown, accounting for 53 of 87 incidents. Hacking/IT Incident is the second most common with 16 incidents.
Independent healthcare practices are the fastest-growing target for healthcare cyberattacks nationwide — attacks on small providers have increased 6x since 2021. California practices face the same threat landscape with fewer resources to defend against it. Patient Protect provides breach prevention specifically for independent practices starting at $39/month.
California requires breach notification within most expedient time possible, and requires notification to the Attorney General when 500 or more individuals are affected. These requirements apply in addition to federal HIPAA's 60-day notification deadline. Reference: Cal. Civ. Code § 1798.29, § 1798.82.
Explore the full breach intelligence dashboard with 12 analytical views, risk forecasting, and attack chain visualization.
Open full dashboardData Disclaimer: This data is aggregated from publicly available sources including the HHS OCR Breach Portal, FTC, state AG databases, CISA advisories, and curated reporting. Certain records are algorithmically modeled from news sources and labeled accordingly. Data is provided “as-is” for informational purposes only. Inclusion of any entity does not imply wrongdoing. Users must independently verify information before relying on it. See Terms of Use.
Editorial coverage · From our partner publication
Editorial analysis of the breaches and enforcement actions reshaping California's threat landscape. From the Patient Protect publication.
Jul 13, 2026 · Cybersecurity
The U.S. Treasury sanctioned a VPN provider and its Ukrainian administrator for supplying ransomware groups with anonymization tools used in attacks on hospitals and other critical infrastructure.
Read on HIPAA Pulse
Jul 13, 2026 · Breach
A laboratory services provider disclosed a data breach affecting roughly 540,000 individuals after the WorldLeaks extortion group claimed to have stolen 720 GB of data from its systems.
Read on HIPAA Pulse
Jul 11, 2026 · Cybersecurity
A ransomware negotiator hired to protect breach victims was sentenced to 70 months in federal prison after secretly feeding BlackCat ransomware operators inside information on their targets' defense strategies.
Read on HIPAA Pulse
Jul 10, 2026 · Cybersecurity
Cyberattacks targeting healthcare service providers and business associates more than doubled in the first half of 2026, outpacing the modest rise in direct attacks on hospitals and clinics.
Read on HIPAA Pulse
Jul 8, 2026 · Breach
A wave of class action lawsuits filed in state and federal courts targets large healthcare corporations accused of exposing or improperly sharing patients' protected health information and personally identifiable information.
Read on HIPAA Pulse
Jul 4, 2026 · Breach
AdaptHealth disclosed a social-engineering breach to the SEC that gave attackers access to patient management systems, document storage, an external EHR, and insurance billing credentials.
Read on HIPAA Pulse
HIPAA Pulse is the editorial publication of Patient Protect. PP’s HIPAA Response translates each story into operational guidance.
