HHS OCR report · 2022
McKenzie Health System data breach
OCR report facts
- Covered entity
- McKenzie Health System
- Entity type
- Healthcare Provider
- State
- Michigan
- Individuals affected
- 51,040
- Submission date
- May 10, 2022
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), McKenzie Memorial Hospital dba McKenzie Health System, reported that it experienced a cyber-attack affecting the protected health information (PHI) of 51,040 individuals. The PHI involved included names, addresses, dates of birth, Social Security and drivers’ license numbers, claims information, diagnoses, medications, medical record numbers, patient account numbers, and health insurance and other treatment information. The CE notified HHS, affected individuals, and t...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the McKenzie Health System data breach?
The report to HHS OCR lists 51,040 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on May 10, 2022.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
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 McKenzie Health System 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 McKenzie Health System.