Q98.1
✓ Billable
Klinefelter syndrome, male with more than two X chromosomes
ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities
Code
Q98.1
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Congenital Malformations, Deformations and Chromosomal Abnormalities
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code Q98.1?
ICD-10-CM code Q98.1 represents Klinefelter syndrome, male with more than two X chromosomes. It is a billable diagnosis code in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.
Is Q98.1 billable?
Yes. Q98.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is Q98.1 in?
Q98.1 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.
Related codes in the Q98 category
Q98
Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Non-billable
Q98.0
Klinefelter syndrome karyotype 47, XXY
Billable
Q98.3
Other male with 46, XX karyotype
Billable
Q98.4
Klinefelter syndrome, unspecified
Billable
Q98.5
Karyotype 47, XYY
Billable
Q98.6
Male with structurally abnormal sex chromosome
Billable
Q98.7
Male with sex chromosome mosaicism
Billable
Q98.8
Other specified sex chromosome abnormalities, male phenotype
Billable
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