MedStar St. Mary's Hospital
Disclosed May 29, 20251 year ago172,915 affectedConfirmed
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 affected | 172,915 (as reported to HHS) |
|---|---|
| Disclosed | May 29, 2025 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report (archive, resolved): MedStar St. Mary's Hospital (Healthcare Provider, MD)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | May 29, 2025 | 172,915 |
History of this record
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.