ICD-10 Code C93.3 – Juvenile myelomonocytic leukemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C93.3 – Juvenile myelomonocytic leukemia
What it is
C93.3 identifies juvenile myelomonocytic leukemia, a rare childhood blood cancer that affects the myeloid cell line. It is a distinct leukemia entity and should be coded when this specific diagnosis is documented.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include persistent monocytosis, enlarged spleen, and signs of bone marrow involvement in a young child.
When to use this code
Use C93.3 when the provider documents juvenile myelomonocytic leukemia, including confirmed or established diagnoses in pediatric patients. Code it from pathology, hematology, or oncology documentation that clearly names JMML. If the record only says “leukemia” or “myelodysplastic/myeloproliferative disorder,” check documentation before assigning this code.
Do not use for
Do not use this code for other leukemias, nonspecific abnormal blood counts, or suspected disease without confirmation. Check documentation if the note does not explicitly identify juvenile myelomonocytic leukemia.
Coding tip
Confirm the exact leukemia subtype in the final diagnosis, not just the initial workup impression.