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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

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What this means — in plain language

MedlinePlus · NIH

Rett syndrome is a rare genetic disease that causes developmental and nervous system problems, mostly in girls. It's related to autism spectrum disorder . Babies with Rett syndrome seem to grow and develop normally at first. Between 3 months and 3 years of age, though, they stop developing and even lose some skills. Symptoms include: Loss of speech Loss of hand movements such as grasping Compulsive movements such as…

Read more about Rett Syndrome at MedlinePlus ↗
Rett syndrome ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

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

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Conditions mapped to this code

MedlinePlus · NIH
AutismRett SyndromeChild Mental HealthAutism Spectrum Disorder

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Benefits & assistance programs

Federal & state

Assistance programs whose eligibility maps to this condition's category. Informational only — eligibility is determined by the administering agency.

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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