Quest Diagnostics Data Breach
Last Updated on October 22, 2026
At A Glance
- What's Going On?
- Attorneys need to hear from people affected by the Quest Diagnostics data breach as they investigate whether a class action lawsuit can be filed.
- What You Can Do
- If you believe your information may have been compromised in the Quest Diagnostics data breach, fill out the form on this page to learn more about the investigation and how you can help.
- Does This Cost Anything?
- It costs nothing to get in touch or to talk to someone about your rights.
- What Can I Get?
- If filed and successful, a class action lawsuit could provide consumers with money for any harm resulting from the Quest Diagnostics breach.
Quest Diagnostics Data Breach: Lawsuit Investigation
Attorneys working with ClassAction.org are looking into whether a class action lawsuit can be filed in light of the Quest Diagnostics data breach.
As part of their investigation, they need to hear from individuals who believe their information may have been put at risk, including Quest Diagnostics employees and individuals who have used its services.
Quest Diagnostics Security Incident: What Happened?
Quest Diagnostics, one of the nation's largest clinical laboratories and testing companies, has reported a data breach in a Form 8-K filed with the Securities and Exchange Commission (SEC) on October 22, 2026.
According to the SEC filing, Quest Diagnostics learned on October 21 of unauthorized access to its Quanum LSM system, which its clients use to place test orders, as well as receive and search for test results. The company then initiated its cybersecurity response measures to contain the activity and assess its nature and impact.
While the investigation is ongoing, Quest Diagnostics has announced that the unauthorized party may have accessed certain patient records. However, the incident had no impact on the company's business operations or its ability to serve patients.
At the time this post was made, no additional information was available about the scope or nature of the Quest Diagnostics data breach.
Quest Diagnostics, along with several other clinical diagnostics companies, previously faced class action lawsuits after a 2018—2019 data breach at billing collections firm American Medical Collection Agency exposed information of millions of laboratory patients.
What You Can Do After the Quest Diagnostics Data Breach
If your information was exposed in the Quest Diagnostics data breach, attorneys want to hear from you. You may be able to start a class action lawsuit to recover compensation for loss of privacy, lost time, out-of-pocket costs, and more.
A successful case could also force Quest Diagnostics to ensure they take proper steps to protect the information they were entrusted with.
Affected by the Quest Diagnostics data breach? Fill out the form on this page today.
Take Action
If you believe your information was exposed in the Quest Diagnostics data breach, fill out the form on this page to get in touch with us.
An attorney or legal representative may then reach out to you to explain more about this investigation and ask you a few questions.
Remember, there is no cost to get in touch, and you are under no obligation to take action after speaking to someone.
Published: October 22, 2026
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The information submitted on this page will be forwarded to Bryson Harris Suciu & DeMay PLLC who has sponsored this investigation.
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