ICD-10 Code I42.9 – Cardiomyopathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I42.9 – Cardiomyopathy, unspecified
What it is
This code identifies cardiomyopathy when the type is not documented. It means the heart muscle is diseased or weakened, but the record does not specify a more precise form.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include reduced cardiac function, enlarged heart, or symptoms of heart failure, but you should code only what is documented.
When to use this code
Use I42.9 when the provider documents cardiomyopathy without naming a subtype such as dilated, hypertrophic, or restrictive. It also fits when the chart confirms cardiomyopathy but lacks enough detail for a more specific code. Review the note for any later clarification.
Do not use for
Do not use this code if the provider identifies a specific cardiomyopathy type or a different heart disease. Do not assign it when documentation is too vague; check documentation instead.
Coding tip
Query for the exact cardiomyopathy type whenever the record only says “cardiomyopathy.”