D89.4 — Mast cell activation syndrome and related disorders

D89.4 is the ICD-10-CM 2025 code for Mast cell activation syndrome and related disorders. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.

D89.4 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under D89.4. Browse the sub-codes listed on this page.

D89.4 belongs to the chapter "Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism" (codes D50-D89). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.

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