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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.

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✅ Includes

  • • myocardiopathy

📋 Code Instructions

  • • Code first: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • ischemic cardiomyopathy (I25.5)
  • • peripartum cardiomyopathy (O90.3)
  • • ventricular hypertrophy (I51.7)

Child Codes (10)

I42.0Dilated cardiomyopathyI42.1Obstructive hypertrophic cardiomyopathyI42.2Other hypertrophic cardiomyopathyI42.3Endomyocardial (eosinophilic) diseaseI42.4Endocardial fibroelastosisI42.5Other restrictive cardiomyopathyI42.6Alcoholic cardiomyopathyI42.7Cardiomyopathy due to drug and external agentI42.8Other cardiomyopathiesI42.9Cardiomyopathy, unspecified

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Code Information

CodeI42
BillableNo — Header code
CategoryDiseases of the circulatory system (I00-I99)
Excludes10 rule(s)
Excludes23 note(s)
Child codes10

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)