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44 disclosed this week · 26,355 on record

Medical College of Wisconsin

Disclosed Sep 2, 20169,500 affectedConfirmed

Official notice

The Medical College of Wisconsin, the covered entity (CE), reported that several employees were the victims of an email phishing attack. The email accounts contained the protected health information (PHI) of 9,500 individuals. The PHI involved included names, dates of birth, addresses, Social Security numbers, medical record numbers, health insurance information, financial information, and treatment information. The CE notified HHS, affected individuals, and the media. As a result of the breach, the CE immediately implemented administrative and technical safeguards to better protect its data and retrained its staff. OCR obtained assurances that the CE implemented the aforementioned corrective actions.

What is known

People affected9,500 (as reported to HHS)
DisclosedSep 2, 2016
DiscoveredSep 20, 2017
HappenedJul 21, 2017
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Medical College of Wisconsin

History of this record
disclosed2026-09-25
2017-11-17 to 2016-09-02by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 9500by backfillSource
disclosed2026-09-25
2017-11-30 to 2017-11-17by backfillSource
summary2026-09-25
empty to The Medical College of Wisconsin, the covered entity (CE), reported that several employees were the victims of an email phishing attack. The email accounts contained the protected health information (PHI) of 9,500 individuals. The PHI involby backfillSource
Added2026-09-25
First recordedby backfillSource

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

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