ICD-10-CM Code F98.5

Adult onset fluency disorder

Version 2021 Billable Code

Valid for Submission

F98.5 is a billable code used to specify a medical diagnosis of adult onset fluency disorder. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code F98.5 might also be used to specify conditions or terms like acquired stammering, adult onset fluency disorder, borderline stuttering, covert stuttering, developmental dysfluency, developmental expressive language disorder, etc

Short Description:Adult onset fluency disorder
Long Description:Adult onset fluency disorder

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code F98.5:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • childhood onset fluency disorder F80.81
  • dysphasia R47.02
  • fluency disorder in conditions classified elsewhere R47.82
  • fluency disorder (stuttering) following cerebrovascular disease (I69. with final characters -23)
  • tic disorders F95

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code F98.5 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acquired stammering
  • Adult onset fluency disorder
  • Borderline stuttering
  • Covert stuttering
  • Developmental dysfluency
  • Developmental expressive language disorder
  • Disorder of fluency
  • Dysfluency
  • Idiopathic stammering
  • Neurogenic stammering
  • Normal non-fluency
  • O/E - stammer/stutter
  • Primary stuttering
  • Psychogenic stuttering
  • Secondary stuttering
  • Stuttering

Convert F98.5 to ICD-9

  • 307.0 - Adult onset flncy disord

Code Classification

  • Mental and behavioural disorders (F00–F99)
    • Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)
      • Oth behav/emotn disord w onset usly occur in chldhd and adol (F98)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Also called: Stammering

Stuttering is a problem that affects the flow of your speech. If you stutter, you may

  • Make certain words sound longer than they should be
  • Find it hard to start a new word
  • Repeat words or parts of words
  • Get tense when you try to speak. You may blink your eyes rapidly, or your lips and jaw may tremble as you struggle to get the words out.

Stuttering can affect anyone. It is most common in young children who are still learning to speak. Boys are three times more likely to stutter than girls. Most children stop stuttering as they grow older. Less than 1 percent of adults stutter.

Scientists don't fully understand why some people stutter. The problem seems to run in families. There is no cure, but treatments can help. They include stuttering therapy, electronic devices, and self-help groups. Starting stuttering therapy early for young children can keep it from becoming a lifelong problem.

NIH: National Institute on Deafness and Other Communication Disorders

  • Stuttering (Medical Encyclopedia)

[Learn More]