ICD-10 / XVII Congenital malformations, deformations and chromosomal abnormalities / Q00-Q07 Congenital malformations of the nervous system / Q04 Other congenital malformations of brain / Q04.1 ArhinencephalyFrom parent levelsChapterXVIICongenital malformations, deformations and chromosomal abnormalitiesOpenExclusionsinborn errors of metabolism (E70-E90)BlockQ00-Q07Congenital malformations of the nervous systemOpenCategoryQ04Other congenital malformations of brainOpenExclusionscyclopia (Q87.0)macrocephaly (Q75.3)Q04.1CategoryBlock Q00-Q07Chapter XVIIArhinencephaly