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Tic disorders are defined in the Diagnostic and Statistical Manual of Mental Disorders (DSM) based on type and duration of tics, as follows:

Transient tic disorder consists of multiple motor and/or phonic tics with duration of less than 12 months.
Chronic tic disorder is either single or multiple motor or phonic tics, but not both, which are present for more than a year.
Tourette's disorder is diagnosed when both motor and phonic tics are present for more than a year.
Tic Disorder NOS is diagnosed when tics are present, but do not meet the criteria for any specific tic disorder.

DSM-IV-TR diagnosis codes for the tic disorders are:

307.20 Tic Disorder NOS (Not Otherwise Specified)
307.21 Transient Tic Disorder
307.22 Chronic Motor or Vocal Tic Disorder
307.23 Tourette's Disorder

ICD10 diagnosis codes are:

F95.0 Transient tic disorder
F95.1 Chronic motor or vocal tic disorder
F95.2 Combined vocal and multiple motor tic disorder [de la Tourette]
F95.8 Other tic disorders
F95.9 Tic disorder, unspecified

Tourette syndrome is the more severe expression of a spectrum of tic disorders, which are thought to be due to the same genetic vulnerability. Nevertheless, most cases of Tourette syndrome are not severe. Although a good body of investigative work indicates genetic linkage of the various tic disorders, further study is needed to confirm the relationship. (Swerdlow, 2005 and Black)

ReferencesEdit

Black, Kevin J. Tourette Syndrome and Other Tic Disorders.
DSM-IV-TR codes
Swerdlow, NR. Tourette Syndrome: Current Controversies and the Battlefield Landscape. Curr Neurol Neurosci Rep. 2005, 5:329-331. PMID 16131414
WHO ICD10 codes

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