Radiation Oncology Network of Southern California
Disclosed Jun 27, 20251 year ago12,944 affectedConfirmed
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 credit monitoring services to the affected individuals the the BA and CE implemented additional administrative, technical, and security safeguards, and retrained workforce members to better protect PHI.
What is known
| People affected | 12,944 (as reported to HHS) |
|---|---|
| Disclosed | Jun 27, 2025 |
| Happened | Dec 13, 2024 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Radiation Oncology Network of Southern Californiaoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Radiation Oncology Network of Southern California (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Jun 27, 2025 | 12,944 |
| California AGresidents of CA | Jul 15, 2025 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 12944 · backfill source
- 2026-09-25 · disclosed: 2025-07-15 to 2025-06-27 · backfill source
- 2026-09-25 · summary: empty to 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 · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.
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