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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Disorders Of The Peripheral Nervous System 350-359 > Hereditary And Idiopathic Peripheral Neuropathy 356.* > 2007 ICD-9-CM Diagnosis 356.4 Idiopathic progressive polyneuropathy  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 Therefore, this code may be out of date.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 356.4 can be accessed here. 356.4 is a specific code that can be used to specify a diagnosis 356.4 contains 3 index entries View the ICD-9-CM Volume 1 356.* hierarchy Index entries containing 356.4: Neuropathy, neuropathic (see also Disorder, nerve) 355.9 peripheral (nerve) (see also Polyneuropathy) 356.9 idiopathic 356.9 progressive 356.4 Polyneuropathy (peripheral) 356.9 idiopathic 356.9 progressive 356.4 progressive 356.4