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

excludes1
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.-)

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