ICD-10-CM > C00-D49 > C81-C96 > C91 > C91.6 C91.6 Prolymphocytic leukemia of T-cell type Non-Billable/Non-Specific Codes C91.60Prolymphocytic leukemia of T-cell type not having achieved remissionC91.61Prolymphocytic leukemia of T-cell type, in remissionC91.62Prolymphocytic leukemia of T-cell type, in relapse