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Code
Description

ICD-10-CM Code F84.2
Rett's syndrome

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Mental Health
Mental Health Code
Indicates that the ICD code is referenced in DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Version 5)
| ICD-10 from 2011 - 2016

F84.2 is a billable ICD code used to specify a diagnosis of rett's syndrome. A 'billable code' is detailed enough to be used to specify a medical diagnosis.


The ICD code F842 is used to code Rett syndrome

Rett syndrome (RTT), originally termed cerebroatrophic hyperammonemia, is a rare genetic postnatal neurological disorder of the grey matter of the brain that almost exclusively affects females but has also been found in male patients. The clinical features include small hands and feet and a deceleration of the rate of head growth (including microcephaly in some). Repetitive stereotyped hand movements, such as wringing and/or repeatedly putting hands into the mouth, are also noted. People with Rett syndrome are prone to gastrointestinal disorders and up to 80% have seizures. They typically have no verbal skills, and about 50% of affected individuals do not walk. Scoliosis, growth failure, and constipation are very common and can be problematic.

Specialty: Pediatrics, Medical Genetics
ICD 9 Code: 330.8

Coding Notes for F84.2 Info for medical coders on how to properly use this ICD-10 code

Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
Asperger's syndrome - instead, use code F84.5
Autistic disorder - instead, use code F84.0
Other childhood disintegrative disorder - instead, use code F84.3

MS-DRG Mapping

  • DRG Group #056-057 - Degenerative nervous system disorders with MCC.
  • DRG Group #056-057 - Degenerative nervous system disorders without MCC.

Coding Advice SNOMET-CT

  • Consider additional code to identify specific condition or disease

ICD-10-CM Alphabetical Index References for 'F84.2 - Rett's syndrome'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code F84.2. Click on any term below to browse the alphabetical index.

Rett's disease or syndrome (F84.2)

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

Other specified cerebral degenerations in childhood (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code F84.2 and a single ICD9 code, 330.8 is an approximate match for comparison and conversion purposes.


Parent Code: F84 - Pervasive developmental disorders

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/F842