2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Mental Retardation 317-319 > Other Specified Mental Retardation 318.* > 2008 ICD-9-CM Diagnosis 318.2 Profound mental retardation  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 Therefore, this code may be out of date.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 318.2 can be accessed here. 318.2 is a specific code that can be used to specify a diagnosis 318.2 contains 5 index entries View the ICD-9-CM Volume 1 318.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 318.2 also known as: IQ under 20 Profound mental subnormality Index entries containing 318.2: Idiot, idiocy (congenital) 318.2 amaurotic (Bielschowsky) (-Jansky) (family) (infantile (late)) (juvenile (late)) (Vogt-Spielmeyer) 330.1 microcephalic 742.1 Mongolian 758.0 oxycephalic 756.0 IQ under 20 318.2 Mental - see also condition subnormality (see also Retardation, mental) 319 profound 318.2 Retardation mental 319 profound, IQ under 20 318.2 Subnormal, subnormality mental (see also Retardation, mental) 319 profound 318.2