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ICD-10-CM Diagnosis Codes

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3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)

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D80-D89 Certain disorders involving the immune mechanism (D80-D89)

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D89 Other disorders involving the immune mechanism, not elsewhere classified

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D89.4 Mast cell activation syndrome and related disorders

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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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