Every public data breach

44 disclosed this week · 26,355 on record

Johns Hopkins Medicine

Disclosed Jul 25, 2023310,405 affectedConfirmed

Official notice

John Hopkins Medicine, the covered entity (CE), reported that it experienced a malware attack that compromised the protected health information (PHI) of 310,405 individuals. The PHI involved included names, addresses, birthdates, diagnoses, Social Security numbers, and claims information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In its mitigation efforts, the CE provided complimentary credit monitoring services and implemented additional administrative and technical safeguards.

What is known

People affected310,405 (as reported to HHS)
DisclosedJul 25, 2023
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

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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