ICD-10 Code C93.Z2 – Other monocytic leukemia, in relapse (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C93.Z2 – Other monocytic leukemia, in relapse
What it is
This code identifies a monocytic leukemia that has returned after a period of remission. Use it when the record specifically states relapse and the leukemia is not otherwise classified more precisely.
Clinical signs
Clinical features vary; refer to documentation. Patients may show findings consistent with recurrent leukemia, such as abnormal blood counts, marrow involvement, or symptoms noted by the treating clinician.
When to use this code
Use C93.Z2 when the provider documents other monocytic leukemia in relapse, or equivalent wording such as recurrent disease after remission. Code the relapse status only when it is clearly stated in the chart. Check documentation if the note does not specify the leukemia type or whether it is in relapse.
Do not use for
Do not use this code for newly diagnosed monocytic leukemia without relapse, or for leukemia described by a more specific ICD-10 category. If relapse is not documented, check documentation.
Coding tip
Confirm that both the leukemia type and relapse status are documented before assigning C93.Z2.