F84.2

Billable

Rett's syndrome

F84.2 is the ICD-10-CM code for Rett's syndrome. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
F01-F99
Parent
F84
Edition
FY2026

F01-F99 Mental, Behavioral and Neurodevelopmental disorders

Excludes1 — not coded here

  • Asperger's syndrome (F84.5)
  • Autistic disorder (F84.0)
  • Other childhood disintegrative disorder (F84.3)

Frequently asked questions

What is ICD-10 code F84.2?
F84.2 is the ICD-10-CM code for "Rett's syndrome". It falls under F01-F99 Mental, Behavioral and Neurodevelopmental disorders.
Is F84.2 a billable code?
Yes — F84.2 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from F84.2?
Excludes1 (not coded here): Asperger's syndrome (F84.5); Autistic disorder (F84.0); Other childhood disintegrative disorder (F84.3).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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