Altos
Disclosed Aug 1, 20251 year ago15,956 affectedConfirmed
The business associate (BA), Altos reported that it was the subject of a data breach that affected the protected health information (PHI) of 1,634 individuals. The PHI involved included clinical and demographic information. The BA notified HHS and affected individuals. In response to the breach, the BA provided complimentary credit monitoring services to the affected individuals and implemented additional administrative, technical, and security safeguards to better protect PHI.
What is known
| People affected | 15,956 (as reported by the organization) |
|---|---|
| Disclosed | Aug 1, 2025 |
| Happened | May 30, 2025 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Altosoag.ca.gov · Official notice | Official notice |
| Indiana Attorney General 2025 data breach report: Altosin.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Altos (Business Associate, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Aug 1, 2025 | |
| Indiana AGresidents of IN | Aug 1, 2025 | 7 |
| HHS archivetotal | Aug 11, 2025 | 1,634 |
History of this record
- 2026-09-25 · sector: other to health · backfill source
- 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), Altos reported that it was the subject of a data breach that affected the protected health information (PHI) of 1,634 individuals. The PHI involved included clinical and demographic information. The BA notified · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 15956 · 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.