G71.1 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
G71.11
Myotonic muscular dystrophy
Billable
10
G71.12
Myotonia congenita
Billable
10
G71.13
Myotonic chondrodystrophy
Billable
10
G71.14
Drug induced myotonia
Billable
10
G71.19
Other specified myotonic disorders
Billable