Health Center Partners of Southern California
Disclosed Apr 8, 20215 years ago337,245 affectedConfirmed
The business associate (BA), Health Center Partners of Southern California, reported that its vendor experienced a ransomware attack that affected the electronic protected health information (ePHI) of 337,245 individuals. The ePHI involved included names, diagnoses, Social Security numbers, medications prescribed, financial and health insurance information, and other treatment information. The BA notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the BA implemented additional administrative, technical, and security safeguards to better protect ePHI.
What is known
| People affected | 337,245 (as reported by the organization) |
|---|---|
| Disclosed | Apr 8, 2021 |
| Happened | Oct 22, 2020 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Health Center Partners of Southern Californiaoag.ca.gov · Official notice | Official notice |
| Indiana Attorney General 2021 data breach report: Health Center Partners of Southern Californiain.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Health Center Partners of Southern California (Business Associate, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| Indiana AGresidents of IN | Apr 8, 2021 | 130 |
| HHS archivetotal | Apr 9, 2021 | 337,245 |
| California AGresidents of CA | Apr 21, 2021 |
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 · summary: empty to The business associate (BA), Health Center Partners of Southern California, reported that its vendor experienced a ransomware attack that affected the electronic protected health information (ePHI) of 337,245 individuals. The ePHI involved · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 337245 · backfill source
- 2026-09-25 · disclosed: 2021-04-21 to 2021-04-08 · 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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