Other Specified Tic Disorder 85
Comorbidity
Many medical and psychiatric conditions have been described as co-occurring with tic disor-
ders, with ADHD and obsessive-compulsive and related disorders be ing particularly com-
mon. The obsessive-compulsive symptoms observed  in tic disorder tend to be characterized
by more aggressive symmetry and order symptoms and poorer response to pharmacotherapy
with selective serotonin reuptake inhibitors. Children with ADHD ma y demonstrate disrup-
tive behavior, social immaturi ty, and learning difficulties th at may interfere with academic
progress and interpersonal relationships and lead to greater impairment than that caused by a
tic disorder. Individuals with tic disorders can also have other movement disorders and other
mental disorders, such as depressive,  bipolar, or substance use disorders.
Other Specified Tic Disorder
307.20 (F95.8)
This category applies to presentations in which symptoms characteristic of a tic disorder
that cause clinically significant distress or impairment in social, occupational, or other im-
portant areas of functioning predominate but do not meet the full criteria for a tic disorder
or any of the disorders in the neurodevelopmental disorders diagnostic class. The other
specified tic disorder category is used in situations in which the clinician chooses to com-
municate the specific reason that the presentation does not meet the criteria for a tic disor-
der or any specific neurodevelopmental disorder. This is done by recording “other specified
tic disorder” followed by the specific reason (e.g., “with onset after age 18 years”). 
Unspecified Tic Disorder
307.20 (F95.9)
This category applies to presentations in whic h symptoms characteristic of a tic disorder
that cause clinically significant distress or impairment in social, occupational, or other im-
portant areas of functioning predominate but do not  meet the full criteria for a tic disorder