Coding and coverage · ICD-10-CM
Q98 Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Report one of the more specific codes below.
Codes under this one
- 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
- Q98.5 Karyotype 47, XYY
- Q98.6 Male with structurally abnormal sex chromosome
- Q98.7 Male with sex chromosome mosaicism
- Q98.8 Other specified sex chromosome abnormalities, male phenotype
- Q98.9 Sex chromosome abnormality, male phenotype, unspecified
Instructional notes
Chapter 17
Excludes2Not included here: the patient may have both; report both when both are present.
Notes
- Codes from this chapter are not for use on maternal records
Section Q90-Q99
Excludes2Not included here: the patient may have both; report both when both are present.
- mitochondrial metabolic disorders (E88.4-)
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1) · Q90-Q99 Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.