Yale New Haven Health (YNHHS) experienced a significant data breach affecting 5.5 million patients, the largest healthcare breach reported in 2025. The breach, detected on March 8, involved unauthorized access to sensitive personal data but did not affect medical records or financial information. YNHHS began notifying affected individuals on April 14 and stated that it has found no evidence of identity theft or fraud. The healthcare system emphasized that patient care remained unaffected and initiated an investigation to address the breach incident.
A major data breach has compromised the personal information of 5.5 million patients at Yale New Haven Health, marking it as the largest healthcare breach in 2025.
The data breach revealed sensitive information such as names, Social Security numbers, and medical record numbers, though no financial data was compromised.
YNHHS confirmed that its investigation showed unauthorized access began on March 8, 2025, though no evidence of identity theft has been found.
Despite the extensive breach, YNHHS reported that it did not affect patient care and has begun notifying impacted individuals.
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