ICD-10 Code I42.8 – Other cardiomyopathies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I42.8 – Other cardiomyopathies
What it is
I42.8 is used for cardiomyopathy types that do not fit the more specific ICD-10 categories. It identifies a disease of the heart muscle when documentation names another cardiomyopathy and no better code applies.
Clinical signs
Clinical features vary; refer to documentation. Commonly, cardiomyopathy may be described with impaired cardiac function, chamber enlargement, or symptoms such as shortness of breath, fatigue, or edema.
When to use this code
Use I42.8 when the provider documents a cardiomyopathy that is not specified as dilated, hypertrophic, restrictive, or another listed subtype. It may also fit when the record states “other cardiomyopathy” or a named form without a dedicated code. Check documentation for the exact diagnosis.
Do not use for
Do not use I42.8 if the record supports a more specific cardiomyopathy code. Do not assign it for ischemic heart disease, heart failure alone, or cardiomyopathy due to another documented underlying condition unless coding guidance directs otherwise.
Coding tip
Code the most specific cardiomyopathy documented and query the provider if the type is unclear.