Quest Diagnostics says unauthorized party accesses patient records in cybersecurity incident
DGX•Quest Diagnostics said an unauthorized party is believed to have accessed certain patient records through its Quanum LSM system. The company said the incident has not materially disrupted operations, and the scope remains under investigation.
1. Investigation underway
Quest Diagnostics discovered unauthorized access to its Quanum LSM test-ordering and results system on October 21, 2026. The company said an unauthorized party is believed to have accessed certain patient records, while the full scope remains under investigation. It activated cybersecurity response procedures, brought in external experts and notified federal law enforcement authorities. The incident has not materially disrupted business operations or the ability to serve patients.
