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44 disclosed this week · 26,355 on record

Umass Memorial Medical Center

Disclosed Sep 14, 202087,404 affectedConfirmed

Official notice

The covered entity (CE), UMass Memorial Medical Center, reported that its business associate experienced a ransomware attack affecting the electronic protected health information (ePHI) of approximately 87,404 individuals. The ePHI involved included names, addresses, dates of birth, and treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice.

What is known

People affected87,404 (as reported to HHS)
DisclosedSep 14, 2020
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Umass Memorial Medical Center

History of this record
Added2026-09-25
First recordedby backfillSource

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

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