2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Organic Psychotic Conditions 290-294 > Dementias 290.* > 2008 ICD-9-CM Diagnosis 290.1 Presenile dementia  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 Therefore, this code may be out of date.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 290.1 can be accessed here. 290.1 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 290.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 290.1 also known as: Brain syndrome with presenile brain disease 290.1 excludes: arteriosclerotic dementia (290.40-290.43) dementia associated with other cerebral conditions (294.10-294.11)