ICD-10-CM › Q00-QA1 › Q90-Q99 › Q codes › Q99

Q99

Other chromosome abnormalities, not elsewhere classified

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 5 more specific codes instead:

  • Q99.0 Chimera 46, XX/46, XY
  • Q99.1 46, XX true hermaphrodite
  • Q99.2 Fragile X chromosome
  • Q99.8 Other specified chromosome abnormalities (also a header)
  • Q99.9 Chromosomal abnormality, unspecified

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Other chromosome abnormalities, not elsewhere classified

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from the Q90-Q99 section Chromosomal abnormalities, not elsewhere classified (Q90-Q99)

Excludes2 - not included here

  • mitochondrial metabolic disorders (E88.4-)