New code ยท FY2026
Billable: use this code on claims.
- New code, effective October 1, 2025 (FY2026).
Code breakdown
Q99.818
- Q99CategoryOther chromosome abnormalities, not elsewhere classified
- 8Character 4Other specified chromosome abnormalities
- 1Character 5Usher syndrome
- 8Character 6Other Usher syndrome
Coding notes
Inclusion terms
- Usher syndrome, type 4
Use additional code (from Q99.81)
- code to identify any auditory and visual manifestations
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ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.