Frederick Health
Disclosed Jan 27, 20251 year ago934,326 affectedConfirmed
Ransomware attack on Frederick Health exposes data of 934,326 patients
Maryland's Frederick Health said a ransomware attack detected on January 27, 2025 let an intruder copy files from a file share server containing patient names, SSNs, driver's license numbers, medical record numbers and insurance data; HHS lists 934,326 affected.
What is known
| People affected | 934,326 (as reported to HHS) |
|---|---|
| Disclosed | Jan 27, 2025 |
| Discovered | Jan 27, 2025 |
| Attack | Ransomware |
| Data exposed | Names, Health, Addresses, Dates of birth, Social Security numbers, Government IDs, Insurance |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report: Frederick Health (Healthcare Provider, MD)ocrportal.hhs.gov · Official notice | Official notice |
| Frederick Health data breach impacts nearly 1 million patientsbleepingcomputer.com · News | News |
| Largest Healthcare Data Breaches of 2025hipaajournal.com · News | News |
Notices filed
History of this record
- 2026-09-25 · attack: hacking to ransomware · seed source
- 2026-09-25 · data_types: ["names","health"] to ["names","health","addresses","dob","ssn","government-id","insurance"] · seed source
- 2026-09-25 · disclosed: 2025-03-28 to 2025-01-27 · seed source
- 2026-09-25 · discovered: empty to 2025-01-27 · seed source
- 2026-09-25 · summary: empty to Maryland's Frederick Health said a ransomware attack detected on January 27, 2025 let an intruder copy files from a file share server containing patient names, SSNs, driver's license numbers, medical record numbers and insurance data; HHS l · seed source
- 2026-09-25 · title: empty to Ransomware attack on Frederick Health exposes data of 934,326 patients · seed source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (HHS OCR), confirmed by HHS OCR. Record counts are as reported. Not legal advice.