2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Other Disorders Of The Central Nervous System 340-349 > Migraine 346.* > 2006 ICD-9-CM Diagnosis 346.21 Variants of migraine with intractable migraine so stated View the most recent version of ICD-9-CM 346.21 346.21 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 346.* hierarchy