ICD-10 Code I42.3 – Endomyocardial (eosinophilic) disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I42.3 – Endomyocardial (eosinophilic) disease
What it is
This code identifies endomyocardial disease associated with eosinophilic involvement of the heart. Use it for documentation of myocardial or endocardial damage linked to eosinophilic infiltration, not for nonspecific cardiomyopathy.
Clinical signs
Clinical features may include restrictive cardiac findings, heart failure symptoms, or evidence of endocardial fibrosis. Clinical features vary; refer to documentation.
When to use this code
Use I42.3 when the provider documents endomyocardial disease, eosinophilic endomyocardial disease, or a similar confirmed diagnosis. It is appropriate when the record clearly links the cardiac disorder to eosinophilic involvement. If the note only says cardiomyopathy or myocarditis, check documentation.
Do not use for
Do not use this code for general cardiomyopathy without eosinophilic or endomyocardial specificity. Do not assign it when the diagnosis is uncertain or when the record describes a different cardiac condition.
Coding tip
Look for explicit provider wording tying the heart disease to eosinophilic endomyocardial involvement before assigning I42.3.