ICD-10-CM > C00-D49 > C81-C96 > C91 > C91.0 C91.0 Acute lymphoblastic leukemia [ALL] Non-Billable/Non-Specific Notes Codes in subcategory C91.0- should only be used for T-cell and B-cell precursor leukemia Codes C91.00Acute lymphoblastic leukemia not having achieved remissionC91.01Acute lymphoblastic leukemia, in remissionC91.02Acute lymphoblastic leukemia, in relapse