ICD-10 Code C93 – Monocytic leukemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C93 – Monocytic leukemia
What it is
C93 identifies monocytic leukemia, a malignant disorder of the blood-forming tissues involving monocytic cells. Use it when the record specifically documents monocytic leukemia rather than another leukemia subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings in leukemia may include fatigue, infections, anemia, bruising, or abnormal blood counts, but you should code only what is documented.
When to use this code
Use C93 when the provider diagnoses monocytic leukemia or records a monocytic leukemia subtype without a more specific ICD-10-CM option. It may also apply when the chart clearly supports this diagnosis in assessment, pathology, or problem lists. If the subtype is unclear, check documentation before coding.
Do not use for
Do not use C93 for other leukemias, such as lymphoid or myeloid leukemia, unless monocytic leukemia is explicitly documented. Do not assign it for suspected disease or abnormal labs alone.
Coding tip
Verify the exact leukemia type in the pathology or provider note before assigning C93.