Quest Diagnostics Says Unauthorized Party Accesses Patient Records in Cybersecurity Incident

• Quest Diagnostics discovered unauthorized access to its Quanum LSM test-ordering and results system on October 21, 2026.
• An unauthorized party is believed to have accessed certain patient records; the full scope remains under investigation.
• The incident has not materially disrupted business operations or the ability to serve patients.
• Cybersecurity response procedures were activated; external experts are assisting the investigation. Federal law enforcement authorities have been notified.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Quest Diagnostics Incorporated published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0000947871-26-000941), on October 22, 2026, and is solely responsible for the information contained therein.