I42
⚠ Non-billable (Header)Cardiomyopathy
Diseases of the circulatory system (I00-I99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
ℹ️ Includes
- • myocardiopathy
⚠️ Excludes2
directBoth codes can exist if both conditions are documented.
- • ischemic cardiomyopathy (I25.5)
- • peripartum cardiomyopathy (O90.3)
- • ventricular hypertrophy (I51.7)
📋 Code Instructions
direct- • Code first: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Child Codes (10)
Clinical Description
ICD-10-CM code I42 represents cardiomyopathy. This code falls under the Diseases of the circulatory system (I00-I99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
Frequently Asked Questions
What is ICD-10 code I42?
ICD-10-CM code I42 is "Cardiomyopathy". It belongs to the category: Diseases of the circulatory system (I00-I99).
Is I42 a billable ICD-10 code?
No, I42 is a non-billable header code. A more specific child code must be used for billing.
Can I42 be coded with other codes?
I42 has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)