M33.2 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
M33.20
Polymyositis, organ involvement unspecified
Billable
10
M33.21
Polymyositis with respiratory involvement
Billable
10
M33.22
Polymyositis with myopathy
Billable
10
M33.29
Polymyositis with other organ involvement
Billable