C90.2 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
C90.20
Extramedullary plasmacytoma not having achieved remission
Billable
10
C90.21
Extramedullary plasmacytoma in remission
Billable
10
C90.22
Extramedullary plasmacytoma in relapse
Billable