Q98
⚠ Non-billable
Other sex chromosome abnormalities, male phenotype, not elsewhere classified
ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities
Code
Q98
System
ICD-10-CM
Billable
No — use specific code
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?
ICD-10-CM code Q98 represents Other sex chromosome abnormalities, male phenotype, not elsewhere classified. It is a non-billable header code requiring a more specific subcategory in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.
Is Q98 billable?
No. Q98 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is Q98 in?
Q98 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.
Related codes in the Q98 category
Q98.0
Klinefelter syndrome karyotype 47, XXY
Billable
Q98.1
Klinefelter syndrome, male with more than two X chromosomes
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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