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[Correspondence] Revising the ICD: stroke is a brain disease

The tenth revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) was long overdue. The ICD-10 was based on outdated medical knowledge and concepts from the 1980s. Since then, science and practice have changed beyond recognition. The WHO neurology topic advisory group (TAG) for the revision of the ICD-10 was formed in 2009. In the ICD-10, cerebrovascular diseases were inconsistently and confusingly spread over several different chapters. In March, 2011, the Neurology and Circulatory TAGs, with contribution of WHO classification representatives and relevant WHO departments, agreed that in the ICD-11, all types of strokes should form a single block, and that this block should be placed in the nervous system diseases chapter.