D89.44

Billable code

Hereditary alpha tryptasemia

The ICD-10 code for hereditary alpha tryptasemia is D89.44.

Clinical notes

Use additional code

This code represents an underlying condition. When a related manifestation is also present, coding convention calls for an additional code to be listed after this one.

code, if applicable, for:
allergy status, other than to drugs and biological substances (Z91.0-)
personal history of anaphylaxis (Z87.892)

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•If the associated manifestation or related condition noted above is also documented, an additional code should be reported alongside this one.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

Related codes in this category

D89.40Mast cell activation, unspecified
D89.41Monoclonal mast cell activation syndrome
D89.42Idiopathic mast cell activation syndrome
D89.43Secondary mast cell activation
D89.49Other mast cell activation disorder
D89.44Hereditary alpha tryptasemia

Associated MS-DRGs

D89.44 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.

Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.