HHS OCR report ยท 2025
Yale New Haven Health System data breach
OCR report facts
- Covered entity
- Yale New Haven Health System
- Entity type
- Healthcare Provider
- State
- Connecticut
- Individuals affected
- 5,556,702
- Submission date
- Apr 11, 2025
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), Yale New Haven Health System, reported that it experienced a hacking incident that affected the protected health information (PHI) of 5,556,702 individuals. The PHI involved included names, dates of birth, addresses, and Social Security numbers. The CE notified HHS, affected individuals, the media, and implemented substitute notice. In response to the breach, the CE implemented additional administrative, technical, and security safeguards.
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Yale New Haven Health System data breach?
The report to HHS OCR lists 5,556,702 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Apr 11, 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 Yale New Haven Health System 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 Yale New Haven Health System.