ICD-10-CM > Q00-QA0 > Q00-Q07 > Q07 Q07 Other congenital malformations of nervous system Non-Billable/Non-Specific Type 2 Excludes congenital central alveolar hypoventilation syndrome (G47.35)familial dysautonomia [Riley-Day] (G90.1)neurofibromatosis (nonmalignant) (Q85.0-) Codes Q07.0Arnold-Chiari syndromeQ07.00Arnold-Chiari syndrome without spina bifida or hydrocephalusQ07.01Arnold-Chiari syndrome with spina bifidaQ07.02Arnold-Chiari syndrome with hydrocephalusQ07.03Arnold-Chiari syndrome with spina bifida and hydrocephalusQ07.8Other specified congenital malformations of nervous systemQ07.9Congenital malformation of nervous system, unspecified