Quest Diagnostics controversies
Controversies tied to this brand in public sources. A listing is not a finding of fault.
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2026
Quest Diagnostics discloses unauthorized access to patient records
Issue disclosure
Quest Diagnostics disclosed that an unauthorized party accessed certain patient records in its Quanum Lab Services Manager system. The company said it was investigating the incident and had not determined the full scope. The disclosure concerned access to patient records within that system, and the company's statement described the matter as under investigation at the time. No further details on the extent of the access, the number of records involved, or the identity of the unauthorized party were provided in the announcement.
Company response
Investigation — Quest Diagnostics
Quest notified federal law enforcement, engaged third-party cybersecurity experts, and initiated its incident response procedures.
Remediation — Quest Diagnostics
After detecting the incident, Quest implemented remedial measures
Investigation — Quest Diagnostics
Quest said it is still investigating which specific types of data were accessed, and it has not yet determined the full scope of the incident.
Investigation — Quest Diagnostics
Quest said it notified law enforcement and is investigating.
Source excerpt
Quest notified federal law enforcement, engaged third-party cybersecurity experts, and initiated its incident response procedures.
In a Form 8-K filed with the U.S. Securities and Exchange Commission on October 22, 2026, the company disclosed that an unauthorized party accessed certain patient records.
After detecting the incident, Quest implemented remedial measures
2021
Quest Diagnostics sued over workers’ compensation billing
Lawsuit filed
A plaintiff sued Quest Diagnostics, alleging that the company directly billed a patient for workers’ compensation-related charges despite notice that the charges were work-related and authorization from the workers’ compensation insurer. The complaint alleges a violation of Florida’s Consumer Collection Practices Act.
Source excerpt
On Tuesday a case was filed in the Sixth Judicial Circuit for Pinellas County, Florida against Quest Diagnostics.
The plaintiff is suing for violation of the Florida Consumer Collection Practices Act.
2019
Data exposure involving American Medical Collection Agency
Quest reported that American Medical Collection Agency had experienced unauthorized access to a system containing information received from multiple entities, including information associated with Quest through a contractor relationship. AMCA subsequently filed for bankruptcy.
2018
CervicalCheck laboratory accuracy controversy
Quest was among laboratories examined in connection with inaccurate cervical smear testing for Ireland's CervicalCheck screening program. The issue generated audits, lawsuits, and a government inquiry.
2011
California Medi-Cal false-claims settlement
Quest paid $241 million to settle California allegations that it overcharged the Medi-Cal program and provided improper incentives to encourage healthcare-provider use of its laboratories.
2009
Federal settlement over faulty medical testing kits
Quest paid $302 million to the U.S. government to resolve allegations that it manufactured and distributed faulty medical testing kits. The settlement was described as the largest whistleblower-related settlement involving a medical laboratory and a faulty product at that time.