D89.42
BillableIdiopathic mast cell activation syndrome
D89.42 is the ICD-10-CM code for Idiopathic mast cell activation syndrome. It is a billable, specific code valid for reimbursement.
D50-D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
No additional coding notes for this code.
Frequently asked questions
- What is ICD-10 code D89.42?
- D89.42 is the ICD-10-CM code for "Idiopathic mast cell activation syndrome". It falls under D50-D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
- Is D89.42 a billable code?
- Yes — D89.42 is a billable, specific ICD-10-CM code valid for reimbursement.
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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