Cerner

Oracle Health has sharply raised its estimate of people affected by a data breach of its Cerner electronic health records system, now saying roughly 20 million patients' information was compromised. The figure is a major increase from earlier disclosures, putting the incident among the largest healthcare data breaches reported in the United States and raising fresh questions about security at the health IT giant.

A data breach at Oracle Health, the health IT business formerly known as Cerner, is reported to have exposed the records of nearly 20 million patients across 80 hospitals in the United States. The incident, dated 2026, would rank among the largest healthcare data breaches on record, raising fresh concerns about the security of electronic medical records held by large technology vendors.