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47 disclosed this week · 26,367 on record

MedStar St. Mary's Hospital

Disclosed May 29, 2025172,915 affectedConfirmed

Official notice

The covered entity (CE), MedStar St. Mary’s Hospital, reported that its business associate (BA) reported that it was the subject of a cybersecurity attack that affected the protected health information (PHI) of 172,915 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and Social Security numbers, diagnoses/conditions, lab results, medications, and health insurance information. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breach, the CE and BA provided complimentary credit monitoring services to the affected individuals and implemented additional safeguards to better protect PHI.

What is known

People affected172,915 (as reported to HHS)
DisclosedMay 29, 2025
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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