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ICD-10-CM 2027 diagnosis code

Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classified

Not billable — use a more specific code

Q98 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.Short description: Oth sex chromosome abnormalities, male phenotype, NEC

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q98

Q98 is the ICD-10-CM diagnosis code for other sex chromosome abnormalities, male phenotype, not elsewhere classified. It belongs to block Q90-Q99 (chromosomal abnormalities, not elsewhere classified) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q98.0 (XXY), Q98.1 (chromosomes), Q98.3 (karyotype), Q98.4 (unspecified), Q98.5 (XYY), Q98.6 (chromosome), Q98.7 (mosaicism), Q98.8 (phenotype) and 1 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Q98

Notes that apply from higher levels

Instructions written at a parent level also apply to Q98.

Broader instructions also apply from Q90-Q99 Chromosomal abnormalities, not elsewhere classified and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q98

Is Q98 billable?

No. Q98 is a header code. Report one of its more specific subcodes instead.