Mental Health Substance Abuse Clinical Classification Software (CCS-MHSA) assigns variables that identify mental health and substance abuse-related diagnoses in hospital discharge records using the ICD-9-CM diagnosis codes.

There are 14 three-digit general CCS-MHSA categories included in CCSMGNn, such as adjustment disorders (value 650), anxiety disorders (value 651), and developmental disorders (value 654). More information on the CCS-MHSA is available under Tools & Software on the HCUP-US website.