F98 - Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence
F98.5 - Adult onset fluency disorder
Excludes 1:
-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.-)