D89.40
BillableMast cell activation, unspecified
D89.40 is the ICD-10-CM code for Mast cell activation, unspecified. 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
Includes
- •Mast cell activation disorder, unspecified
- •Mast cell activation syndrome, NOS
Frequently asked questions
- What is ICD-10 code D89.40?
- D89.40 is the ICD-10-CM code for "Mast cell activation, unspecified". It falls under D50-D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
- Is D89.40 a billable code?
- Yes — D89.40 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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