Horizon Behavioral Health
Disclosed Apr 21, 20251 year ago49,303 affectedConfirmed
The covered entity (CE), Horizon Behavioral Health, reported that it experienced a ransomware incident that affected the protected heath information (PHI) of 49,303 individuals. The PHI involved included names, dates of birth, social security numbers, drivers’ license numbers, diagnoses, medications, and claims information. The CE notified HHS, affected individuals, the media, and posted substitute notice to its website. In response to the breach, the CE offered free credit monitoring to affected individuals and implemented additional administrative, technical, and security safeguards.
What is known
| People affected | 49,303 (as reported to HHS) |
|---|---|
| Disclosed | Apr 21, 2025 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| Vermont Attorney General: 2025-04-21 Horizon Behavioral Health Data Breach Notice to Consumersago.vermont.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Horizon Behavioral Health (Healthcare Provider, VA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| Vermont AGresidents of VT | Apr 21, 2025 | |
| HHS archivetotal | Apr 21, 2025 | 49,303 |
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 49303 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), Horizon Behavioral Health, reported that it experienced a ransomware incident that affected the protected heath information (PHI) of 49,303 individuals. The PHI involved included names, dates of birth, social securi · 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.