C91.5 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
C91.50
Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission
Billable
10
C91.51
Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remission
Billable
10
C91.52
Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapse
Billable