ICD-10-CM 2027
ICD-10 code for adult onset stuttering
From the official ICD-10-CM alphabetic index entry “Stuttering › adult onset”. Page updated September 29, 2026.
About coding adult onset stuttering
The ICD-10-CM code for adult onset stuttering is F98.5 (Adult onset fluency disorder).
Within F98 (other behavioral and emotional disorders with onset usually occurring in childhood and adolescence), F98.5 is specifically for adult onset fluency disorder. Related codes cover enuresis not due to a substance or known physiological condition (F98.0), Encopresis not due to a substance or known physiological condition (F98.1), other feeding disorders of infancy and childhood (F98.2), Pica of infancy and childhood (F98.3), Stereotyped movement disorders (F98.4), other specified behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F98.8) and unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F98.9).
Don't report F98.5 together with the conditions in its Excludes1 note: 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) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for F98.5)
Common questions about adult onset stuttering ICD-10 codes
What is the ICD-10 code for adult onset stuttering?
- F98.5 — Adult onset fluency disorder.
Is F98.5 billable?
- Yes. F98.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F98.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F98.5 as a principal diagnosis.
Is F98.5 a CC or MCC?
- No. F98.5 is neither a CC nor an MCC under MS-DRG v44.0.