act of authorizing authorization for release of confidential health information An act of authorizing that is signed by a patient, or his legal representative, or clinical study participant for the use or disclosure of oral, written, or electronic form of confidential health information that identifies the individual and relates to the medical history, diagnosis, treatment, or prognosis of his condition. Asiyah Yu Lin, Yongqun He NCIt C70679 This class is under group discussion as of 03/26/2019.