Q99.8
⚠ Non-billable (Header)Other specified chromosome abnormalities
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ No additional coding notes for Q99.8
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CodeQ99.8
BillableNo — Header code
ParentQ99
CategoryCongenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Excludes10 rule(s)
Excludes20 note(s)
Child codes2
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)