Massive data breach of blood testing provider exposes 12 million people's personal, financial and medical information Quest Diagnostics is one of the biggest blood testing providers in the US There was a data breach on its web payment system between August 1, 2018, and March 30, 2019 Credit card numbers, bank account information, medical information, and Social Security numbers may have been exposedBy Mia De Graaf Health Editor For Dailymail.com Published: 15:02 BST, 3 June 2019 | Updated: 15:12 BST, 3 June 2019 Viewcomments Nearly 12 million people may have had their personal, financial and medical information breached in a hack on Quest Diagnostics, one of the biggest blood testing providers in the US. The firm told security regulators that it last week learned of a data breach on its web payment system between August 1, 2018, and March 30, 2019. Credit card numbers, bank account information, medical information, and Social Security numbers may have been exposed, the company said in a filing on Monday. The firm said it did not yet have sufficiently 'detailed or complete' information from AMCA, a billing collections vendor, to report to regulators. This is a developing story. More to follow. Quest Diagnostics is one of the biggest blood testing providers in the US. There was a data breach on its web payment system between August 1, 2018, and March 30, 2019 Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility