ICD-11 definition : Crigler-Najjar syndrome type 1 is the most severe form ofCrigler-Najjar syndrome,
a hereditary disorder of hepatic bilirubin conjugation, characterized by severe neonatal
unconjugated hyperbilirubinemia due to a complete absence of hepatic bilirubin glucuronosyltransferase
(BGT).;
ICD-11 synonym : Bilirubin uridinediphosphate glucuronosyltransferase deficiency type 1; Bilirubin glucuronyltransferase deficiency; Bilirubin-UGT deficiency type 1; Hereditary unconjugated hyperbilirubinaemia type 1; UGT deficiency type 1; CNS1 - [Crigler-Najjar syndrome type 1];
Crigler-Najjar syndrome type 1 is the most severe form ofCrigler-Najjar syndrome,
a hereditary disorder of hepatic bilirubin conjugation, characterized by severe neonatal
unconjugated hyperbilirubinemia due to a complete absence of hepatic bilirubin glucuronosyltransferase
(BGT).