HHS OCR report ยท 2021
Cancer Treatment Centers of America at Midwestern Regional Medical Center data breach
OCR report facts
- Covered entity
- Cancer Treatment Centers of America at Midwestern Regional Medical Center
- Entity type
- Healthcare Provider
- State
- Illinois
- Individuals affected
- 104,808
- Submission date
- Mar 19, 2021
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Business associate present
- No
- Status
- Archive (closed)
OCR description
Cancer Treatment Centers of America at Midwestern Regional Medical Center, the covered entity (CE), reported that an employee was the subject of an email phishing scheme that compromised the protected health information (PHI) of 104,808 individuals. The PHI involved included names, medical record numbers, health insurance information, and treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In its mitigation efforts, the CE ...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Cancer Treatment Centers of America at Midwestern Regional Medical Center data breach?
The report to HHS OCR lists 104,808 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Mar 19, 2021.
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 Cancer Treatment Centers of America at Midwestern Regional Medical 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 Cancer Treatment Centers of America at Midwestern Regional Medical Center.