Western Montana Mental Health Center
Disclosed Nov 14, 20241 year ago86,758 affectedConfirmed
The covered entity (CE), Western Montana Mental Health Center, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 86,758 individuals. The CE notified HHS and the affected individuals. In response to the breach, the CE implemented additional technical and security safeguards.
What is known
| People affected | 86,758 (as reported by the organization) |
|---|---|
| Disclosed | Nov 14, 2024 |
| Happened | Sep 11, 2024 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| Vermont Attorney General: 2025-07-17 Western Montana Mental Health Center Data Breach Notice to Consumersago.vermont.gov · Official notice | Official notice |
| Indiana Attorney General 2025 data breach report: Western Montana Mental Health Centerin.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Western Montana Mental Health Center (Healthcare Provider, MT)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Nov 14, 2024 | 86,758 |
| Vermont AGresidents of VT | Jul 17, 2025 | |
| Indiana AGresidents of IN | Jul 17, 2025 | 23 |
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 · disclosed: 2025-07-17 to 2024-11-14 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), Western Montana Mental Health Center, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 86,758 individuals. The CE notified HHS and the affected individu · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 86758 · backfill source
- 2026-09-25 · occurred: empty to 2024-09-11 · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (Vermont AG), confirmed by Vermont AG. Record counts are as reported. Not legal advice.