Q98: Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Codes under Q98 (Other sex chromosome abnormalities, male phenotype, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| Q98.0 | Klinefelter syndrome karyotype 47, XXY | ✓ |
| Q98.0 | Klinefelter syndrome karyotype 47, XXY | ✓ |
| Q98.1 | Klinefelter syndrome, male with more than two X chromosomes | ✓ |
| Q98.1 | Klinefelter syndrome, male with more than two X chromosomes | ✓ |
| Q98.3 | Other male with 46, XX karyotype | ✓ |
| Q98.3 | Other male with 46, XX karyotype | ✓ |
| Q98.4 | Klinefelter syndrome, unspecified | ✓ |
| Q98.4 | Klinefelter syndrome, unspecified | ✓ |
| Q98.5 | Karyotype 47, XYY | ✓ |
| Q98.5 | Karyotype 47, XYY | ✓ |
| Q98.6 | Male with structurally abnormal sex chromosome | ✓ |
| Q98.6 | Male with structurally abnormal sex chromosome | ✓ |
| Q98.7 | Male with sex chromosome mosaicism | ✓ |
| Q98.7 | Male with sex chromosome mosaicism | ✓ |
| Q98.8 | Other specified sex chromosome abnormalities, male phenotype | ✓ |
| Q98.8 | Other specified sex chromosome abnormalities, male phenotype | ✓ |
| Q98.9 | Sex chromosome abnormality, male phenotype, unspecified | ✓ |
| Q98.9 | Sex chromosome abnormality, male phenotype, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code Q98?
Q98 is an ICD-10-CM category covering Other sex chromosome abnormalities, male phenotype, not elsewhere classified. It contains 18 more specific diagnosis codes, 18 of which are billable.
Is Q98 a billable code?
No — Q98 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Q98.0 — Klinefelter syndrome karyotype 47, XXY). 18 of the 18 codes under Q98 are billable.
What codes fall under Q98?
Q98 includes Q98.0, Q98.0, Q98.1, Q98.1, Q98.3, plus 13 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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