HHS OCR report ยท 2022
Cancer and Hematology Centers of Western Michigan data breach
OCR report facts
- Covered entity
- Cancer and Hematology Centers of Western Michigan
- Entity type
- Healthcare Provider
- State
- Michigan
- Individuals affected
- 43,071
- Submission date
- Mar 18, 2022
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
Cancer and Hematology Centers of Western Michigan, the covered entity (CE), reported that it experienced a ransomware attack that affected the protected health information (PHI) of 43,071 individuals. The PHI involved included names, addresses, dates of birth, social security numbers, financial information, and diagnoses and conditions. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In response to the breach, the CE provided complimentary cr...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Cancer and Hematology Centers of Western Michigan data breach?
The report to HHS OCR lists 43,071 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Mar 18, 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 Cancer and Hematology Centers of Western Michigan 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 Cancer and Hematology Centers of Western Michigan.