" /> Klinefelter syndrome - CISMeF





ICD-11 code : LD50.3;

Preferred Label : Klinefelter syndrome;

ICD-11 definition : Klinefelter syndrome defines a group of chromosomal disorders in which there is at least one extra X chromosome compared with the normal 46,XY male karyotype. The effects on physical features and on physical and cognitive development increase with the number of extra X's, and each extra X is associated with an intelligence quotient (IQ) decrease of approximately 15-16 points, with language most affected, particularly expressive language skills.;

ICD-11 synonym : Klinefelter syndrome, unspecified; Klinefelter syndrome in males;

ICD-11 "other" category code : LD50.3Y;

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Klinefelter syndrome defines a group of chromosomal disorders in which there is at least one extra X chromosome compared with the normal 46,XY male karyotype. The effects on physical features and on physical and cognitive development increase with the number of extra X's, and each extra X is associated with an intelligence quotient (IQ) decrease of approximately 15-16 points, with language most affected, particularly expressive language skills.

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03/05/2025


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