HHS OCR report · 2025
MedStar St. Mary's Hospital data breach
OCR report facts
- Covered entity
- MedStar St. Mary's Hospital
- Entity type
- Healthcare Provider
- State
- Maryland
- Individuals affected
- 172,915
- Submission date
- May 29, 2025
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
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 substi...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the MedStar St. Mary's Hospital data breach?
The report to HHS OCR lists 172,915 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on May 29, 2025.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from MedStar St. Mary's Hospital legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or MedStar St. Mary's Hospital.