A computer-implemented system and method utilizes patient claim data, including medical, pharmaceutical, laboratory claims, and self-report survey data to classify patients into one or more health management groups (HMGs) relating to one or more particular diseases, health conditions or health pre-conditions, each having an associated severity level that indicates the severity of the patient's condition. The HMGs assigned to each patient (e.g., health plan member) enable users of the system and method to identify patients having particular diseases, health conditions and pre-conditions based not only upon the patients' claim data but also based upon the patients' self-report survey data obtained from various sources. The HMGs assigned for each patient also enable the user to identify the severity of the patient's disease, condition or pre-condition to facilitate intervention and/or preventative care of the patient.