28 CFR 202.241: Personal health data.

The term personal health data means health information that indicates, reveals, or describes the past, present, or future physical or mental health or condition of an individual; the provision of healthcare to an individual; or the past, present, or future payment for the provision of healthcare to an individual. This term includes basic physical measurements and health attributes (such as bodily functions, height and weight, vital signs, symptoms, and allergies); social, psychological, behavioral, and medical diagnostic, intervention, and treatment history; test results; logs of exercise habits; immunization data; data on reproductive and sexual health; and data on the use or purchase of prescribed medications.