ICD-10-CM > C00-D49 > C81-C96 > C91 > C91.A C91.A Mature B-cell leukemia Burkitt-type Non-Billable/Non-Specific Type 1 Excludes Burkitt lymphoma (C83.7-) Codes C91.A0Mature B-cell leukemia Burkitt-type not having achieved remissionC91.A1Mature B-cell leukemia Burkitt-type, in remissionC91.A2Mature B-cell leukemia Burkitt-type, in relapse