Quest Diagnostics breach exposes data on 11.9 million patients

Blood testing group Quest Diagnostics announced Monday that the personal information of 11.9 million patients has been breached, including Social Security numbers, financial information and medical data.

The company said in a statement that an “unauthorized user” gained access to the American Medical Collection Agency (AMCA) system, a billing collection service provider for Quest.

Quest noted in its official statement on the breach that it had not yet received “complete information” on the details of the breach from the AMCA, such as which customers were impacted, and that it has also not been able to verify that the breach took place. The company said that it does not believe that laboratory test results were accessed.

Quest said it is “committed to keeping our patients, health care providers, and all relevant parties informed as we learn more,” adding that the company “is taking this matter very seriously and is committed to the privacy and security of our patients’ personal information.”