D89.40 - Mast cell activation, unspecified
- Applicable to Mast cell activation, unspecified
- The 2025 edition of ICD10-CM D89.40 became effective on October 1, 2024.
- This is the American ICD10-CM version of D89.40 - other international versions of ICD10 D89.40 may differ.
- D89.40 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Inclusion Term
- Mast cell activation disorder, unspecified
- Mast cell activation syndrome, NOS
The following codes above D89.40 contain annotation back-references that may be applicable to D89.40:
Section: D80-D89 Certain disorders involving the immune mechanism
Category: D89 Other disorders involving the immune mechanism, not elsewhere classified
Billable/Specific Code
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Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
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