Myotonic disorders

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01

Group of inherited muscular disorders associated with clinical and/or electrical myotonia. Myotonia is defined clinically as the occurrence of “delayed relaxation of muscle after voluntary contraction or percussion.”

sections/codes in this section (8C71-8C71)

• Myotonic dystrophy  (8C71.0)
• Chondrodystrophic myotonia  (8C71.1)
• Myotonia congenita  (8C71.2)
• Drug-induced myotonia  (8C71.3)
• Neuromyotonia  (8C71.4)
• Pseudomyotonia  (8C71.5)
• Other specified myotonic disorders  (8C71.Y)
• Myotonic disorders, unspecified  (8C71.Z)

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