G71 - Primary disorders of muscles
Excludes 2:
-arthrogryposis multiplex congenita Q74.3)
-metabolic disorders (E70-E88)
-myositis (M60.-)
G71.0 - Muscular dystrophy
G71.1 - Myotonic disorders
G71.11 - Myotonic muscular dystrophy
G71.12 - Myotonia congenita
G71.13 - Myotonic chondrodystrophy
G71.14 - Drug induced myotonia
G71.19 - Other specified myotonic disorders
G71.2 - Congenital myopathies
G71.3 - Mitochondrial myopathy, not elsewhere classified
G71.8 - Other primary disorders of muscles
G71.9 - Primary disorder of muscle, unspecified