Q99.818

Other Usher syndrome

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q99.818
Synonyms

Usher syndrome, type 4

Inherited from Q99.81Usher syndrome
Use additional

code to identify any auditory and visual manifestations

Inherited from Q90-Q99Chromosomal abnormalities, not elsewhere classified
Excludes 2

mitochondrial metabolic disorders (E88.4-)

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2

inborn errors of metabolism (E70-E88)

Note

Codes from this chapter are not for use on maternal records

Official Guidelines for Q99.818

FY 2026 ›
I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q99.818

Sections whose FY 2026 text names Q99.818, its Q99 category, or a range containing it — the chapter guidance above is the authoritative source.