All ICD10 Codes

I42

Non-Billable
ChapterI00–I99
Rankcategory
Official Description

Cardiomyopathy

Use a more specific code (10 billable)
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
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Instructional Notes

Includes
  • myocardiopathy
Excludes2(Not included here. Code separately if applicable.)
  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Code First
  • pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I30-I5AOther forms of heart disease (I30-I5A)
I42CardiomyopathyNot billable
I42.0Dilated cardiomyopathyBillable
I42.1Obstructive hypertrophic cardiomyopathyBillable
I42.2Other hypertrophic cardiomyopathyBillable
I42.3Endomyocardial (eosinophilic) diseaseBillable
I42.4Endocardial fibroelastosisBillable
I42.5Other restrictive cardiomyopathyBillable
I42.6Alcoholic cardiomyopathyBillable
I42.7Cardiomyopathy due to drug and external agentBillable
I42.8Other cardiomyopathiesBillable
I42.9Cardiomyopathy, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I42:

chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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