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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Infectious And Parasitic Diseases 001-139 > Poliomyelitis And Other Non-Arthropod-Borne Viral Diseases Of Central Nervous System 045-049 > Slow Virus Infection Of Central Nervous System 046.* > 2008 ICD-9-CM Diagnosis 046.9 Unspecified slow virus infection of central nervous system  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 Therefore, this code may be out of date.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 046.9 can be accessed here. 046.9 is a specific code that can be used to specify a diagnosis 046.9 contains 3 index entries View the ICD-9-CM Volume 1 046.* hierarchy Index entries containing 046.9: Infection, infected, infective (opportunistic) 136.9 slow virus 046.9 specified condition NEC 046.8 virus, viral 079.99 central nervous system NEC 049.9 slow virus 046.9 specified condition NEC 046.8 slow 046.9 specified condition NEC 046.8