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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Hereditary And Degenerative Diseases Of The Central Nervous System 330-337 > 2008 ICD-9-CM Diagnosis 330 Cerebral degenerations usually manifest in childhood  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 Therefore, this code may be out of date.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 330 can be accessed here. 330 is a non-specific code that cannot be used to specify a diagnosis Use additional code to identify associated mental retardation