Q99.2

ICD-10Billable

Fragile X chromosome

Official ICD-10-CM descriptor (FY2026)

Fragile X chromosome

Q99.2 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Fragile X syndrome

Related codes in Q99

Where this code sits

Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)
Block: Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Parent code: Q99

Krasyn AI Coder

Get code suggestions automatically as you type notes. Free for 50 analyses.

Install for Chrome — free

Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.