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Acadia Montana Treatment Center

Disclosed May 17, 20197 years ago14,794 affectedConfirmed

Official notice

Acadia Montana Treatment Center, the covered entity (CE), reported that an employee’s computer was infected with malware that affected the electronic protected health information (ePHI) of 14,794 individuals. The ePHI involved included names, addresses, birthdates, drivers’ license numbers, diagnoses/conditions, lab results, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE retrained its workforce, implemented additional technical safeguards, and sanctioned the workforce member responsible for the breach.

What is known

People affected14,794 (as reported to HHS)
DisclosedMay 17, 2019
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

WhereFiledPeople
HHS archivetotalMay 17, 201914,794
History of this record
  • 2026-09-25 · added · backfill source

First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.

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