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I42Non-billableSave

I42 - Cardiomyopathy

ICD-10-CM Chapter 9: Diseases of the circulatory system · I30-I5A Other forms of heart disease (I30-I5A) · Top-level category · FY2027

Coding Guidance

I42 is a non-billable heading. Report one of the 10 more specific codes below.

Includes, Excludes and Coding Notes

IncludesFrom I42

Conditions this code covers.

  • myocardiopathy
Excludes 2 — Not Included HereFrom I42

Not part of this code; report both codes when the patient has both conditions.

  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Code FirstFrom I42

Sequence the underlying condition before this code.

  • pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Excludes 2 — Not Included HereFrom Chapter I00-I99

Not part of this code; report both codes when the patient has both conditions.

  • 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.-)

More Specific Codes (10)

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

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with I42.