Mast cell activation syndrome and related disorders

**Excludes1:** - aggressive systemic mastocytosis (C96.21) - congenital cutaneous mastocytosis (Q82.2) - (non-congenital) cutaneous mastocytosis (D47.01) - (indolent) systemic mastocytosis (D47.02) - malignant mast cell neoplasm (C96.2-) - malignant mastocytoma (C96.29) - mast cell leukemia (C94.3-) - mast cell sarcoma (C96.22) - mastocytoma NOS (D47.09) - other mast cell neoplasms of uncertain behavior (D47.09) - systemic mastocytosis associated with a clonal hematologic non-mast cell lineage disease (SM-AHNMD) (D47.02)