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HHS OCR report ยท 2025

Radiation Oncology Network of Southern California, LLC data breach

Radiation Oncology Network of Southern California, LLC, a healthcare provider in California, reported a breach affecting 12,944 individuals to HHS OCR on Jun 27, 2025.

OCR report facts

Covered entity
Radiation Oncology Network of Southern California, LLC
Entity type
Healthcare Provider
State
California
Individuals affected
12,944
Submission date
Jun 27, 2025
Type of breach
Hacking/IT Incident
Location of breached information
Email
Business associate present
Yes
Status
Archive (closed)

OCR description

The covered entity (CE), Radiation Oncology Network of Southern California, LLC, reported that multiple employees of its business associate (BA) were the subjects of an email phishing incident that affected the protected health information (PHI) of 12,944 individuals. The PHI involved included clinical, demographic, and financial information. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided complimentary credi...

Text as published on the HHS OCR breach portal.

Frequently asked questions

How many people were affected by the Radiation Oncology Network of Southern California, LLC data breach?

The report to HHS OCR lists 12,944 individuals affected.

When was it reported to HHS?

It was submitted to HHS OCR on Jun 27, 2025.

What type of breach was it?

The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Email.

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 Radiation Oncology Network of Southern California, LLC 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 Radiation Oncology Network of Southern California, LLC.