C94.3 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
C94.30
Mast cell leukemia not having achieved remission
Billable
10
C94.31
Mast cell leukemia, in remission
Billable
10
C94.32
Mast cell leukemia, in relapse
Billable