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Q99

⚠ Non-billable (Header)

Other chromosome abnormalities, not elsewhere classified

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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✅ No additional coding notes for Q99

Child Codes (5)

Q99.0Chimera 46, XX/46, XYQ99.146, XX true hermaphroditeQ99.2Fragile X chromosomeQ99.8Other specified chromosome abnormalitiesQ99.9Chromosomal abnormality, unspecified

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Code Information

CodeQ99
BillableNo — Header code
CategoryCongenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Excludes10 rule(s)
Excludes20 note(s)
Child codes5

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)