ICD-10-CM I42: Cardiomyopathy

ICD-10-CM Diagnosis Code (2025)

Official Description for I42

Cardiomyopathy

Coding Notes & Guidelines for I42

Includes Notes

myocardiopathy

Excludes2: Not Included Here
  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Code First

pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

Code First

poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)

Use Additional Code

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Inclusion Terms

Congestive cardiomyopathy

Inclusion Terms

Hypertrophic subaortic stenosis (idiopathic)

Inclusion Terms

Nonobstructive hypertrophic cardiomyopathy

Inclusion Terms
  • Endomyocardial (tropical) fibrosis
  • Löffler's endocarditis
Inclusion Terms
  • Congenital cardiomyopathy
  • Elastomyofibrosis
Inclusion Terms

Constrictive cardiomyopathy NOS

Inclusion Terms

Cardiomyopathy (primary) (secondary) NOS

Code Also

presence of alcoholism (F10.-)

Child Codes (More Specific Codes for I42):

I42.0 - Dilated cardiomyopathy I42.1 - Obstructive hypertrophic cardiomyopathy I42.2 - Other hypertrophic cardiomyopathy I42.3 - Endomyocardial (eosinophilic) disease I42.4 - Endocardial fibroelastosis I42.5 - Other restrictive cardiomyopathy I42.6 - Alcoholic cardiomyopathy I42.7 - Cardiomyopathy due to drug and external agent I42.8 - Other cardiomyopathies I42.9 - Cardiomyopathy, unspecified

About ICD-10-CM Code I42 (Cardiomyopathy)

ICD-10-CM code I42 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM I42 became effective on October 1, 2024.

This page provides detailed information about I42 - Cardiomyopathy. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Cardiomyopathy.