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Q98 Oth sex chromosome abnormalities, male phenotype, NEC

ICD-10-CM category Q98 sits in Chapter 17 (Congenital malformations, deformations and chromosomal abnormalities, Q00-Q99). It contains 9 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Billable codes in Q98

CodeDescription
Q98.0Klinefelter syndrome karyotype 47, XXY
Q98.1Klinefelter syndrome, male with more than two X chromosomes
Q98.3Other male with 46, XX karyotype
Q98.4Klinefelter syndrome, unspecified
Q98.5Karyotype 47, XYY
Q98.6Male with structurally abnormal sex chromosome
Q98.7Male with sex chromosome mosaicism
Q98.8Other specified sex chromosome abnormalities, male phenotype
Q98.9Sex chromosome abnormality, male phenotype, unspecified

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