Q98
Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Q98 is a non-billable ICD-10-CM code category for other sex chromosome abnormalities, male phenotype, not elsewhere classified. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Q98.0 Klinefelter syndrome karyotype 47, XXY; Q98.1 Klinefelter syndrome, male with more than two X chromosomes; Q98.3 Other male with 46, XX karyotype; Q98.4 Klinefelter syndrome, unspecified and 5 more. Its coding notes include 2 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (2 notes)
- mitochondrial metabolic disorders (E88.4-)
- inborn errors of metabolism (E70-E88)
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
More specific codes under Q98 9
- Q98.0Klinefelter syndrome karyotype 47, XXYBillable
- Q98.1Klinefelter syndrome, male with more than two X chromosomesBillable
- Q98.3Other male with 46, XX karyotypeBillable
- Q98.4Klinefelter syndrome, unspecifiedBillable
- Q98.5Karyotype 47, XYYBillable
- Q98.6Male with structurally abnormal sex chromosomeBillable
- Q98.7Male with sex chromosome mosaicismBillable
- Q98.8Other specified sex chromosome abnormalities, male phenotypeBillable
- Q98.9Sex chromosome abnormality, male phenotype, unspecifiedBillable