Almost 12 million customers of one of the nation's biggest blood testing providers may have had their personal information compromised in a cyberattack, Quest Diagnostics officials said Monday in a regulatory filing.
AMCA provides billing collection services to Optum360, which is a Quest contractor.More news: Russo Brothers Producing Magic
AMCA believes the personal information includes financial data, Social Security numbers, and medical information.
According to Quest, AMCA first notified them on May 14 of potential unauthorized activity on the AMCA web payment page, and on May 31, they notified them that the data included information on about 11.9 million Quest patients. It indicated that plans are in the works to begin notifying individual patients but did not give a timeline.More news: WTA Roland Garros: Muguruza takes down Svitolina. Martic ousts Pliskova
Until more is known, Quest Diagnostics will stop using that data management provider and patients whose data was compromised will be contacted by the companies.
But AMCA hasn't yet provided it with "detailed or complete" information about the securiy breach, including which information may have been affected, it said. Laboratory test results are not provided to outside companies and were not affected.More news: Top North Korean official reappears days after purge report
The company said it is working with law enforcement officials. Headquartered in Secaucus, New Jersey, it has 45,000 employees worldwide.