HHS OCR report ยท 2023
Medical College of Wisconsin data breach
OCR report facts
- Covered entity
- Medical College of Wisconsin
- Entity type
- Healthcare Provider
- State
- Wisconsin
- Individuals affected
- 240,667
- Submission date
- Nov 14, 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), Medical College of Wisconsin, reported that its third-party vendor experienced a cybersecurity incident that allowed unauthorized access to its server and compromised the protected health information (PHI) of 240,667 individuals. The PHI involved included names, addresses, Social Security numbers, dates of birth, claims information, diagnoses, lab results, and medications. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE pro...
Text as published on the HHS OCR breach portal.
Other reports by Medical College of Wisconsin
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| Medical College of Wisconsin | WI | Healthcare Provider | 3,179 | Sep 2, 2016 | Hacking/IT Incident | Archive (closed) |
Frequently asked questions
How many people were affected by the Medical College of Wisconsin data breach?
The report to HHS OCR lists 240,667 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Nov 14, 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 Medical College of Wisconsin 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 Medical College of Wisconsin.