Q98.1Billable
Klinefelter syndrome, male with more than two X chromosomes
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q98
- Effective date
- October 1, 2026
Related codes in category Q98
Q98Oth sex chromosome abnormalities, male phenotype, NECQ98.0Klinefelter syndrome karyotype 47, XXYYesQ98.3Other male with 46, XX karyotypeYesQ98.4Klinefelter syndrome, unspecifiedYesQ98.5Karyotype 47, XYYYesQ98.6Male with structurally abnormal sex chromosomeYesQ98.7Male with sex chromosome mosaicismYesQ98.8Other specified sex chromosome abnormalities, male phenotypeYesQ98.9Sex chromosome abnormality, male phenotype, unspecifiedYes
Frequently asked questions
What is ICD-10 code Q98.1?
Q98.1 is an ICD-10-CM diagnosis code for Klinefelter syndrome, male with more than two X chromosomes.
Is Q98.1 a billable code?
Yes. Q98.1 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is Q98.1 in?
Q98.1 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q98.1 become effective?
Q98.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q98.1?
Q98.1 belongs to category Q98, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.