Mast cell leukemia, in remission

This code signifies a diagnosis of mast cell leukemia that is currently in a state of remission. Mast cell leukemia is a rare and aggressive form of systemic mastocytosis characterized by the proliferation of atypical mast cells in the bone marrow and other organs, with a significant percentage of mast cells in the peripheral blood. Remission indicates a significant reduction or absence of disease activity following treatment.

This code is appropriate when a patient with a documented history of mast cell leukemia has achieved a state of remission, as confirmed by clinical, laboratory, and pathological findings. It should be used when the patient is no longer actively undergoing treatment for the acute phase of the disease but is being monitored for recurrence. Documentation should clearly state "mast cell leukemia in remission" or similar terminology.

• Always confirm the specific type of mast cell disorder; this code is exclusive to mast cell leukemia.
• Do not use this code if the patient is still actively receiving treatment for the leukemia; instead, use the active disease code.
• Ensure documentation explicitly states "in remission" to support the use of this code.