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Q99.2

Fragile X chromosome

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 1 never code together
Q90-Q99block
Excludes2
  • mitochondrial metabolic disorders (E88.4-)E88.4-

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 1
Q99.2code
Inclusion terms
  • Fragile X syndrome
Index entries leading here 2
  • Fragile, fragility
  • Syndrome — see also Disease
Alongside this code 4 same parent — Q99
Q99.0 Chimera 46, XX/46, XY Q99.1 46, XX true hermaphrodite Q99.8 Other specified chromosome abnormalities category Q99.9 Chromosomal abnormality, unspecified
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

RX08HCC148

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
yes
Code set
FY2026
Parent
Q99
Block
Q90-Q99
Siblings
4

Present FY2024–FY2027.