The information on the affected system included patient names, dates of birth, addresses, phone numbers, dates of service, providers and balance information as well as credit card and bank information.
"Incidents such as with Quest Diagnostics and LabCorp should act as a warning to every company - now more than ever, systems should be built secure by design, with a rigorous system of protection and prevention that is regularly tested in place".
The data breach that potentially exposed the personal and healthcare information of almost 12 million Quest Diagnostics customers has also possibly affected another 7.7 million customers of fellow lab testing company LabCorp.
The SEC filing reports that the AMCA notified Quest Diagnostics and Optum 360 on May 14 of "potential unauthorized activity on AMCA's web payment page" that occurred between August 1, 2018 and March 30, 2019.
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Quest rivals LabCorp and Opko Health have subsequently reported being affected by the same breach, bringing the total number of impacted patients to upwards of 20 million.
A data breach at a company associated with a major provider of diagnostic testing services has exposed the personal information of millions of patients, according to a filing with the Securities and Exchange Commission.
The incident is under the investigation performed by New York, Minnesota, North Carolina, and MI state attorneys.
AMCA has advised BioReference that AMCA is providing notice to state attorneys general and other state agencies as required by applicable state data breach laws.
AMCA told BioReference that "no Social Security Numbers were compromised" in the breach and, according to the OPKO Health subsidiary "no laboratory results or diagnostic information" were provided and stored on AMCA systems.