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ICD-10-CM 2027

ICD-10 code for leukemia mast cell

C94.3

Mast cell leukemia

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Mast cell › leukemia”. Page updated September 29, 2026.

About coding leukemia mast cell

The ICD-10-CM code for leukemia mast cell is C94.3 (Mast cell leukemia).

Within C94 (other leukemias of specified cell type), C94.3 is specifically for mast cell leukemia. Related codes cover acute erythroid leukemia (C94.0), acute megakaryoblastic leukemia (C94.2), acute panmyelosis with myelofibrosis (C94.4), myelodysplastic disease, not elsewhere classified (C94.6) and other specified leukemias (C94.8).

To report this condition, pick the subcode that matches the documentation: C94.30 (not having achieved remission), C94.31 (in remission) and C94.32 (in relapse).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about leukemia mast cell ICD-10 codes

What is the ICD-10 code for leukemia mast cell?

C94.3 — Mast cell leukemia (a header code; report a more specific subcode).

Is C94.3 billable?

No. C94.3 is a header code. Report one of its more specific subcodes instead.