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Medical College of Wisconsin

Disclosed Nov 14, 20232 years ago240,667 affectedConfirmed

Official notice

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 provided credit monitoring services and terminated its business relationship with the vendor.

What is known

People affected240,667 (as reported to HHS)
DisclosedNov 14, 2023
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

WhereFiledPeople
HHS archivetotalNov 14, 2023240,667

Other breaches at Medical College of Wisconsin

BreachAffected
Disclosed Oct 11, 2020Oct 11, 20205 years agoHacking5,655
Disclosed Aug 14, 2019Aug 14, 20197 years ago995
Disclosed Sep 2, 2016Sep 2, 201610 years agoHacking9,500
History of this record
  • 2026-09-25 · added · backfill source

First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.

Everything about Medical College of Wisconsin

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