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ICD-10-CM Diagnosis Codes →
section notes
3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) →
section notes
D80-D89 Certain disorders involving the immune mechanism (D80-D89) →
section notes
D89 Other disorders involving the immune mechanism, not elsewhere classified →
section notes
D89.4 Mast cell activation syndrome and related disorders →
section notes
D89.40   Mast cell activation, unspecified
D89.41   Monoclonal mast cell activation syndrome
D89.42   Idiopathic mast cell activation syndrome
D89.43   Secondary mast cell activation
D89.44   Hereditary alpha tryptasemia
D89.49   Other mast cell activation disorder
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