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ICD-10 diagnosis code

G71.1 Myotonic disorders

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G71.1 is the ICD-10 code for Myotonic disorders. It is a four-character subcategory of G71 (Primary disorders of muscles), the most specific level in the WHO edition. It belongs to the block G70–G73 (Diseases of myoneural junction and muscle) in Chapter VI, Diseases of the nervous system.

Code type
Subcategory (4 characters)
Chapter
VI · G00–G99
Classification
WHO ICD-10, 2019 version

What G71.1 includes

Conditions and terms that are coded here.

  • Dystrophia myotonica [Steinert]
  • Myotonia:
    • chondrodystrophic
    • drug-induced
    • symptomatic
  • Myotonia congenita:
    • NOS
    • dominant [Thomsen]
    • recessive [Becker]
  • Neuromyotonia [Isaacs]
  • Paramyotonia congenita
  • Pseudomyotonia

Coding notes

  • Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

G71.1 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

G71.1Myotona sjukdomar

NorwayICD-10-NO

G71.1Myoton lidelse

DenmarkICD-10-DK

DG711Myoton sygdom

  • DG711ADystrophia myotonica
  • DG711BDominant myotonia congenita
  • DG711CRecessiv myotonia congenita
  • DG711DMyotonia congenita UNS
  • DG711EMyotoni forårsaget af lægemiddel
  • DG711FMyotonia symptomatica
  • DG711GMyotonia chondrodystrophica
  • DG711INeuromyotonia
  • and 2 more national subcodes
FinlandICD-10-FI

G71.1Muu lihasjänteyssairaus

  • G71.11Myotoninen dystrofia (Steinert)
  • G71.12Synnynnäinen myotonia
  • G71.13Neuromyotonia (Isaacs)
  • G71.14Synnynnäinen paramyotonia
  • G71.15Pseudomyotonia
  • G71.18Muu lihasjänteyssairaus
GermanyICD-10-GM

G71.1Myotone Syndrome

FranceICD-10-FR

G71.1Affections myotoniques

NetherlandsICD-10-NL

G71.1myotone aandoeningen

United StatesICD-10-CM

Listed through more specific codes:

  • G71.11Myotonic muscular dystrophy
  • G71.12Myotonia congenita
  • G71.13Myotonic chondrodystrophy
  • G71.14Drug induced myotonia
  • G71.19Other specified myotonic disorders

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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