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D89.43 Secondary mast cell activation
BackD89Other disorders involving the immune mechanism, not elsewhere classifiedCategory7 →D89.0Polyclonal hypergammaglobulinemiaCategoryD89.1CryoglobulinemiaCategoryD89.2Hypergammaglobulinemia, unspecifiedCategoryD89.3Immune reconstitution syndromeCategoryD89.4Mast cell activation syndrome and related disordersCategory6 →D89.40Mast cell activation, unspecifiedCategoryD89.41Monoclonal mast cell activation syndromeCategoryD89.42Idiopathic mast cell activation syndromeCategoryD89.43Secondary mast cell activationCategoryD89.44Hereditary alpha tryptasemiaCategoryD89.49Other mast cell activation disorderCategoryD89.8Other specified disorders involving the immune mechanism, not elsewhere classifiedCategory5 →D89.81Graft-versus-host diseaseCategory4 →D89.810Acute graft-versus-host diseaseCategoryD89.811Chronic graft-versus-host diseaseCategoryD89.812Acute on chronic graft-versus-host diseaseCategoryD89.813Graft-versus-host disease, unspecifiedCategoryD89.82Autoimmune lymphoproliferative syndrome [ALPS]CategoryD89.83Cytokine release syndromeCategory6 →D89.831Cytokine release syndrome, grade 1CategoryD89.832Cytokine release syndrome, grade 2CategoryD89.833Cytokine release syndrome, grade 3CategoryD89.834Cytokine release syndrome, grade 4CategoryD89.835Cytokine release syndrome, grade 5CategoryD89.839Cytokine release syndrome, grade unspecifiedCategoryD89.84IgG4-related diseaseCategoryD89.89Other specified disorders involving the immune mechanism, not elsewhere classifiedCategoryD89.9Disorder involving the immune mechanism, unspecifiedCategory
CategoryCODABLE
D89.43
Secondary mast cell activation
EXAMPLES
Secondary mast cell activation syndrome
CODING RULE
Code also: underlying etiology, if known
- Chapter
- III · Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Section
- D80-D89
- Valid from
Source
CMS ICD-10-CM Tabular List, edition FY2026.