HHS OCR report ยท 2023
McLaren Health Care data breach
OCR report facts
- Covered entity
- McLaren Health Care
- Entity type
- Healthcare Provider
- State
- Michigan
- Individuals affected
- 2,103,881
- Submission date
- Oct 20, 2023
- 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), McLaren Health Care, reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 2,103,881 individuals. The PHI involved included names, addresses, birthdates, Social Security numbers, claims, and other treatment information. The CE notified HHS, affected individuals, and the media. The CE implemented additional administrative and technical safeguards. OCR provided technical assistance to the CE.
Text as published on the HHS OCR breach portal.
Other reports by McLaren Health Care
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| McLaren Health Care | MI | Healthcare Provider | 743,131 | Jun 24, 2025 | Hacking/IT Incident | Under investigation |
Frequently asked questions
How many people were affected by the McLaren Health Care data breach?
The report to HHS OCR lists 2,103,881 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Oct 20, 2023.
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 McLaren Health Care 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 McLaren Health Care.