The Record, SecurityWeek and BleepingComputer reported a data breach at Quest Diagnostics (United States) on 23 October 2026, and it has been confirmed. Exposed: Health and medical information, Financial account and card details, Test results and Billing data.
Status
Confirmed breach
People affected
Not reported yet
Reported
23 October 2026
Who is affected
Canada, United States
What was exposed
Health and medical information
Financial account and card details
Test results
Billing data
How it happened
How
Hacking A key system used by Quest Diagnostics to manage medical test results was taken offline on Thursday after the company discovered unauthorized access.source
Look for Quest Diagnostics’s own notice or letter: it should say what of yours was involved. Keep it.
Call your bank on the number printed on your card (never one from a message), check recent payments and ask for a new card.
Check your health insurer’s statements for treatment you never had.
Expect scams that use your details: calls, texts or emails pretending to be Quest Diagnostics, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.
Privacy Unpacked