G71: Primary disorders of muscles
G71.2: Congenital myopathies

excludes2
arthrogryposis multiplex congenita (Q74.3)
G71.20: Congenital myopathy, unspecified
G71.21: Nemaline myopathy
G71.22: Centronuclear myopathy
G71.29: Other congenital myopathy

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