2006 ICD-9-CM Volume 1 Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 > Hereditary And Degenerative Diseases Of The Central Nervous System 330-338 > 330 Cerebral degenerations usually manifest in childhood 331 Other cerebral degenerations 332 Parkinson's disease 333 Other extrapyramidal disease and abnormal movement disorders 334 Spinocerebellar disease 335 Anterior horn cell disease 336 Other diseases of spinal cord 337 Disorders of the autonomic nervous system