Medical testing company LabCorp said 7.7 million of its consumers had their personal and financial information exposed through a data breach.

The issue stems from a "potential unauthorized activity" linked to a third-party billing company, the American Medical Collection Agency (AMCA), which also affects almost 12 million Quest Diagnostics patients in a breach announced earlier this week.

An "unauthorized user" might have had access to personal information, financial data, Social Security numbers and medical information. 

In both Quest's and LabCorp's case, the companies say lab results were not affected. 

LabCorp issued its announcement in a filing Tuesday with the U.S. Securities and Exchange Commission: "LabCorp is working closely with AMCA to obtain more information and to take additional steps as may be appropriate once more is known about the AMCA Incident.

"In response to initial notification of the AMCA Incident, LabCorp ceased sending new collection requests to AMCA and stopped AMCA from continuing to work on any pending collection requests involving LabCorp consumers."

About 200,000 LabCorp customers will be notified if their credit card or bank account information might have been accessed. There are at least 9 LabCorp locations in Louisville.

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