Q99.2

✓ Billable

Fragile X chromosome

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

Also Known As

Fragile X syndrome

✅ No additional coding notes for Q99.2

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Code Information

CodeQ99.2

BillableYes

ParentQ99

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

Excludes10 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)