Stuttering is classified as a disorder in the DSM-5:

Name: Stuttering is classified as a disorder in the DSM-5:
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Stuttering is no longer clasified as such in the DSM-5, and has been renamed as Childhood-Onset Fluency Disorder. Additionally, the usage of fillers ("um," "ah," "you know," "like," etc.) is no longer considered a symptom, but anxiety and avoidance have been added as criteria for the disorder.

Stuttering Is Classified as a Disorder in the DSM-5