Allegedly, when a patient entered any of the following information -- types of medical treatment sought; name, sex, language and specialty of a physician; searches related to COVID-19 information and treatment; locations where treatment was sought; or that a telephone was made to schedule an appointment -- it was shared simultaneously with Meta. "By way of illustration, if a patient made an appointment with a doctor for treatment of cancer, the tracking code Cedars-Sinai put on its website conveyed that information to Meta, which in turn allowed Meta to include that patient in marketing target groups that it offered to its other advertising clients who wanted to market to cancer patients," according to the lawsuit. In a proposed class action lawsuit filed in Louisiana last month, patients alleged LCMC Health Systems, based in New Orleans, and Willis-Knighton Health System, based in northwestern Louisiana, shared sensitive medical data without patients' knowledge or consent