Quest Diagnostics reports cyber breach affecting 'certain patient records'

133 reports from 133 outlets in 4 languages · first reported 2026-10-22 00:00 UTC · updated 2026-10-23 18:17 UTC · JSON

Quest Diagnostics, a medical laboratory testing company, has reported an unauthorized access to its IT system that may have exposed certain patient records^{[1–5, 7–10]}. According to Quest Diagnostics, the breach affected its Quest Diagnostics Nichols Institute IT system, which is used by clients^{[1, 3–5, 7, 10]}. The company has not specified the number of patients affected by the breach^{[2–5, 8–10]}.

This brief was written by a language model from the reports below; bracketed numbers link to them. Check the reports for anything that matters.

Reports

1. Quest Diagnostics reports cyber breach affecting 'certain patient records'Published by nbcnews.com, canoncitydailyrecord.com, pottsmerc.com, mendocinobeacon.com, thetimes-tribune.com, mercurynews.com, baltimoresun.com, pilotonline.com, timescall.com, eastbaytimes.com, bostonherald.com, republicanherald.com and 76 more · 2026-10-23 02:10 UTC
2. If you used Quest Diagnostics, your data may have been compromised: Here's what happenedPublished by ktvu.com, fox13seattle.com, fox13news.com, fox10phoenix.com, fox5dc.com, fox26houston.com, fox35orlando.com, fox2detroit.com, fox5atlanta.com, fox7austin.com, wogx.com, fox4news.com and 1 more · 2026-10-22 20:56 UTC
3. Quest Diagnostics reports cyber breach affecting ‘certain patient records’Published by seattletimes.com, mynorthwest.com, kaaltv.com · 2026-10-22 14:32 UTC
4. Quest Diagnostics Reports Patient-Record Intrusion As Labs Face Scrutiny Over Data SecurityPublished by wbap.com, klif.com · 2026-10-23 13:00 UTC
5. Quest Diagnostics Reports Hack on IT System Used by ClientsPublished by bankinfosecurity.com, govinfosecurity.com · 2026-10-23 01:15 UTC
6. If you used Quest Diagnostics, your data may have been compromised: Here’s what happenedPublished by fox5ny.com, fox32chicago.com · 2026-10-22 20:56 UTC
7. Laboratory Operator Quest Reports Cyber Breach Affecting Patient RecordsPublished by insurancejournal.com, 933thedrive.com · 2026-10-22 13:51 UTC
8. Quest Diagnostics has been hacked. Patient data was exposed. They serve roughly half of U.S. hospitals and physicians. Investigation ongoing.investmentwatchblog.com · en · 2026-10-23 18:17 UTC
9. Quest, hasta verilerine yetkisiz erişimi açıkladıteknoblog.com · tr · 2026-10-23 18:15 UTC
10. Major attack on Quest Diagnostics used by 85m Americans exposes private patient recordsdailymail.com · en · 2026-10-23 17:33 UTC
11. Quest Diagnostics reports cyber breach that could affect ‘certain patient records’reviewjournal.com · en · 2026-10-23 17:01 UTC
12. Quest Diagnostics confirms data breach exposed patient recordsbleepingcomputer.com · en · 2026-10-23 16:40 UTC
13. Quest Diagnostics confirms patient records were stolen in a data breach.theverge.com · en · 2026-10-23 15:28 UTC
14. Μεγάλη διαρροή δεδομένων υγείας στη Quest Diagnosticssbctv.gr · el · 2026-10-23 15:24 UTC
15. Lab testing giant Quest Diagnostics confirms patients' personal and health data was compromised during breachtechcrunch.com · en · 2026-10-23 15:00 UTC
16. Major US medical lab operator, Quest Diagnostics, reports cyber breach exposed patient recordshindustantimes.com · en · 2026-10-23 02:35 UTC
17. Quest Diagnostics hit by cyberattackhealthcaredive.com · en · 2026-10-22 20:18 UTC
18. Quest Diagnostics Data Breach Quanum Lsm Exposes Patient Recordsel-balad.com · en · 2026-10-22 20:15 UTC
19. Quest Diagnostics sufrió un ciberataque que expuso historiales médicos de sus pacientes en Estados Unidosinfobae.com · es · 2026-10-22 19:13 UTC
20. Quest Diagnostics Reports Unauthorized Access of Patient Recordsgizmodo.com · en · 2026-10-22 17:05 UTC
21. Quest Diagnostics reports cyber breach affecting 'patient records' – NBC Connecticutnbcconnecticut.com · en · 2026-10-22 16:58 UTC
22. Quest Diagnostics reports cyber breach affecting 'patient records' – NBC4 Washingtonnbcwashington.com · en · 2026-10-22 16:58 UTC
23. Quest Diagnostics reports cyber breach affecting 'patient records' – NBC New Yorknbcnewyork.com · en · 2026-10-22 16:58 UTC
24. Quest Diagnostics reports cyber breach affecting 'patient records' – NBC10 Philadelphianbcphiladelphia.com · en · 2026-10-22 16:58 UTC
25. Quest Diagnostics reports cyber breach affecting 'patient records' – NBC 5 Dallas-Fort Worthnbcdfw.com · en · 2026-10-22 16:58 UTC
26. Quest Diagnostics reports cybersecurity incident involving patient recordsbeckershospitalreview.com · en · 2026-10-22 16:13 UTC
27. Quest Diagnostics reports cyber breach affecting 'certain patient records' – Winnipeg Free Presswinnipegfreepress.com · en · 2026-10-22 14:33 UTC
28. Quest Diagnostics confirms patient data accessed in cyberattackfoxbusiness.com · en · 2026-10-22 00:00 UTC