2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Neurotic Disorders, Personality Disorders, And Other Nonpsychotic Mental Disorders 300-316 > Disturbance Of Conduct Not Elsewhere Classified 312.* > 2008 ICD-9-CM Diagnosis 312.21 Socialized conduct disorder mild degree  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 312.21 can be accessed here. 312.21 is a specific code that can be used to specify a diagnosis 312.21 contains 2 index entries View the ICD-9-CM Volume 1 312.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 312.21: Disorder - see also Disease conduct (see also Disturbance, conduct) 312.9 socialized (type) 312.20 unaggressive 312.21 Disturbance - see also Disease conduct 312.9 socialized (type) 312.20 unaggressive 312.21