Q99.8: Other specified chromosome abnormalities

No longer billable · FY2026

Not billable: this is a header. Use one of the more specific codes below.

• No longer billable from October 1, 2025: it became a header for more specific codes: Q99.811, Q99.812, Q99.813, Q99.818, Q99.819, Q99.89.

Code breakdown

Codes under Q99.8

• Q99.81 Usher syndrome
• Q99.89 Other 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.