Q99.89: Other specified chromosome abnormalities

New code · FY2026

Billable: use this code on claims.

New code, effective October 1, 2025 (FY2026).

Code breakdown

Q99.89

Q99CategoryOther chromosome abnormalities, not elsewhere classified
8Character 4Other specified chromosome abnormalities
9Character 5Other specified chromosome abnormalities

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All FY2026 ICD-10-CM changes

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.