University of Massachusetts Chan Medical School
Disclosed Aug 21, 20233 years ago135,394 affectedConfirmed
The covered entity (CE), The University of Massachusetts Chan Medical School, reported that it was the subject of a cyber-attack that affected the protected health information (PHI) of 135,974 individuals. The PHI involved included names, dates of births, addresses, Social Security numbers, diagnoses, medications, financial and claims information, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards to better protect its PHI.
What is known
| People affected | 135,394 (as reported to HHS) |
|---|---|
| Disclosed | Aug 21, 2023 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report (archive, resolved): University of Massachusetts Chan Medical School (Business Associate, MA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Aug 21, 2023 | 135,394 |
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.
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