ICD-10-CM › Q00-QA1 › Q90-Q99 › Q99 Other chromosome abnormalities,... › Q99.8

Q99.8

Other specified chromosome abnormalities

Not billableICD-10-CM diagnosis code.

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

Billable FY2016 to FY2025, and a category header from FY2026.

Submit one of these 2 more specific codes instead:

  • Q99.81 Usher syndrome (also a header)
  • Q99.89 Other specified chromosome abnormalities

Use instead:

  • Q99.811 Usher syndrome, type 1 stated for FY2025
  • Q99.812 Usher syndrome, type 2 stated for FY2025
  • Q99.813 Usher syndrome, type 3 stated for FY2025
  • Q99.818 Other Usher syndrome stated for FY2025
  • Q99.819 Usher syndrome, unspecified stated for FY2025

What has happened to this code

Every change the publisher made, from 2007 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. FY2007 Added to the draft code set draft Other specified chromosome abnormalities
  2. FY2026 Stopped being billable

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-)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Showing 40 of 141 index phrases.

Codes in the same group

CodeDescriptionStatus
Q99.0 Chimera 46, XX/46, XY Valid
Q99.1 46, XX true hermaphrodite Valid
Q99.2 Fragile X chromosome Valid
Q99.9 Chromosomal abnormality, unspecified Valid