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.

The 3-digit general CCS-MHSA categories included in ECCSMGNn are assigned from External Cause of Injury Codes (E Codes). The 3-digit categories for other ICD-9-CM codes is stored in the HCUP variables CCSMGNn. More information on the CCS-MHSA is available under Tools & Software on the HCUP-US website.