Alphabetic Index FY2027

I42

Cardiomyopathy

FY2027Chapter 9: Diseases of the circulatory system/I30–I5A Other forms of heart disease

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

I42 is a non-billable ICD-10-CM code category for cardiomyopathy. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are I42.0 Dilated cardiomyopathy, I42.1 Obstructive hypertrophic cardiomyopathy, I42.2 Other hypertrophic cardiomyopathy, I42.3 Endomyocardial (eosinophilic) disease and 6 more. Its coding notes include a Code first instruction and 13 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

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

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • 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.-)

Includes

Further defines or gives examples of the content of the category.

This code
  • myocardiopathy

More specific codes under I42 10