ICD-10-CM 2027
ICD-10 code for activation
Choose a code from the options below based on the documentation.
From the official ICD-10-CM alphabetic index entry “Activation”. Page updated September 29, 2026.
About coding activation
The official ICD-10-CM index doesn't give a single default code for activation; the code depends on the details below.
More specific activation codes (official index)
- mast cell (disorder) (syndrome) D89.40 — Mast cell activation, unspecified
- idiopathic D89.42 — Idiopathic mast cell activation syndrome
- monoclonal D89.41 — Monoclonal mast cell activation syndrome
- secondary D89.43 — Secondary mast cell activation
- specified type NEC D89.49 — Other mast cell activation disorder
Common questions about activation ICD-10 codes
What is the ICD-10 code for mast cell activation?
- D89.40 — Mast cell activation, unspecified.