Is D89.4 a billable code?
No. D89.4 is a header code that groups 6 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
D89.4: Mast cell activation syndrome and related disorders
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
D89.4 groups related diagnoses under mast cell activation syndrome and related disorders. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under D89.4
- D89.40Mast cell activation, unspecified
- D89.41Monoclonal mast cell activation syndrome
- D89.42Idiopathic mast cell activation syndrome
- D89.43Secondary mast cell activation
- D89.44Hereditary alpha tryptasemia
- D89.49Other mast cell activation disorder
Other codes in D89 Other disorders involving the immune mechanism, not elsewhere classified
D89.4 questions
What does D89.4 mean?
D89.4 is the ICD-10-CM code for Mast cell activation syndrome and related disorders. It is in chapter 3, Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.