Earlier this month, the American Medical Collection Agency (AMCA), who provides billing collection services for Optum360, a contractor of Quest Diagnostics, confirmed unauthorized activity on AMCA’s payment page, affecting nearly 12 million patients over a period from August 1 of 2018 to March 30 of 2019. The unknown individual or team who is responsible for this attack was able to access medical information, financial data, and Social Security numbers.

Quest is currently working with a third-party cyberforensics team to trace the breach and has committed to suspending any collection requests to AMCA during this time. Quest was already a victim of a similar security breach in 2016, when hackers were able to gain access to their MyQuest patient portal, exposing the contact information and lab results of about 34,000 patients.

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