ICD-10-CM > G00-G99 > G70-G73 > G71 > G71.1 > G71.12 G71.12 Myotonia congenita Billable/Specific Copy Code Copy Description Applicable To Acetazolamide responsive myotonia congenitaDominant myotonia congenita [Thomsen disease]Myotonia leviorRecessive myotonia congenita [Becker disease]