CHICAGO — Advocate Aurora Health reports a data breach may have revealed sensitive information of as many as 3 million patients.

Advocate said pixel technology installed on its patients portal transmitted certain patient information to Google and Meta, and possibly to other third-party vendors.

The company said it disabled and removed the pixels from its platforms and has launched an internal investigation into the matter.

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“Like others in our industry, Advocate Aurora Health implemented online tracking technologies called pixels to understand how patients and others interact with our website.

We have learned that these technologies may transmit patient information to the third-party vendors that provided us with the pixel technology. As a result, when patients used Advocate Aurora Health patient portals available through MyChart and LiveWell platforms, as well some of our scheduling widgets, certain protected health information (“PHI”) would be disclosed in certain circumstances, particularly for users concurrently logged into their Facebook or Google accounts. We have disabled and/or removed these pixels and are taking appropriate action to ensure this does not happen again.”

Their help line is 866-884-3206.