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F95.2 Combined vocal and multiple motor tic disorder
F95.8 Other tic disorders
F95.9 Tic disorder, unspecified
A large, community-based study suggested that over 19% of school-age children have tic disorders. The children with tic disorders in that study were usually undiagnosed. (Kurlan) As many as 1 in 100 people may experience some form of tic disorder, usually before the onset of puberty. (NIH) 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)
Treatment of tic disorders, although not usually necessary, is similar to treatment of Tourette syndrome. Tics should be distinguished from other causes of tourettism.
Kurlan R, McDermott MP, Deeley C, et al. Prevalence of tics in schoolchildren and association with placement in special education. Neurology. 2001 Oct 23;57(8):1383-8. PMID 11673576
The Tourette Syndrome Classification Study Group. Definitions and classification of tic disorders. Arch Neurol. 1993 Oct;50(10):1013-6. PMID 8215958 Full text.