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F84.2

✓ Billable

Rett's syndrome

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

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❌ Excludes1

direct

Cannot be coded with F84.2

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

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Code Information

CodeF84.2
BillableYes
ParentF84
CategoryMental, Behavioral and Neurodevelopmental disorders (F01-F99)
Excludes13 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)