ICD-10 Code C93.9 – Monocytic leukemia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C93.9 – Monocytic leukemia, unspecified
What it is
C93.9 identifies a leukemia involving monocytic cells when the record does not specify the exact subtype. Use it for documentation that confirms monocytic leukemia but leaves the type unspecified.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include anemia, infections, bruising, fatigue, or abnormal blood counts consistent with leukemia.
When to use this code
Use C93.9 when the provider documents monocytic leukemia without naming a more specific category. It is appropriate when the chart confirms the diagnosis but lacks detail on subtype or classification. If later notes specify a more exact form, code to that documented diagnosis instead.
Do not use for
Do not use this code for acute myeloid leukemia or other leukemias that are specifically documented. Check documentation if the record describes a more precise monocytic leukemia subtype or a different hematologic malignancy.
Coding tip
Query the provider when “monocytic leukemia” is documented but the subtype is unclear, so you can assign the most specific code available.