ICD-10 Code I42.5 – Other restrictive cardiomyopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I42.5 – Other restrictive cardiomyopathy
What it is
I42.5 identifies restrictive cardiomyopathy that does not fit a more specific subtype. The heart muscle is stiff, so the ventricles fill poorly even though pumping strength may be relatively preserved.
Clinical signs
Patients may have shortness of breath, fatigue, edema, or signs of heart failure. Clinical features vary; refer to documentation, especially echocardiographic or specialist findings showing restrictive filling.
When to use this code
Use this code when the provider documents restrictive cardiomyopathy and does not name a more specific cause or subtype. It may apply when imaging, exam, or cardiology notes support a restrictive pattern but the record says “other” or “unspecified” restrictive cardiomyopathy.
Do not assign it from symptoms alone. Make sure the diagnosis is established in the chart and that no more specific cardiomyopathy code is documented.
Do not use for
Do not use this code for dilated, hypertrophic, or arrhythmogenic cardiomyopathy. If the record names a specific infiltrative or secondary cause, check documentation for a more precise code.
Coding tip
Query the provider when the note says “restrictive cardiomyopathy” without subtype or cause, so you can code the most specific documented diagnosis.