HHS OCR report · 2019
Acadia Montana Treatment Center data breach
OCR report facts
- Covered entity
- Acadia Montana Treatment Center
- Entity type
- Healthcare Provider
- State
- Montana
- Individuals affected
- 14,794
- Submission date
- May 17, 2019
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Business associate present
- No
- Status
- Archive (closed)
OCR description
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 work...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Acadia Montana Treatment Center data breach?
The report to HHS OCR lists 14,794 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on May 17, 2019.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Email.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from Acadia Montana Treatment Center legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or Acadia Montana Treatment Center.