2025 ICD-10-CM Diagnosis Code I42.8

Other cardiomyopathies

• I42.8 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2025 edition of ICD-10-CM I42.8 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I42.8 – other international versions of ICD-10 I42.8 may differ.

The following code(s) above I42.8 contain annotation back-references

 that may be applicable to I42.8:

• I00-I99  Diseases of the circulatory system
• I42  Cardiomyopathy

Approximate Synonyms

• Arrhythmogenic right ventricular dysplasia
• Cardiomyopathy, obscure african
• Cardiomyopathy, primary (heart condition)
• Congenital arrhythmogenic right ventricular dysplasia (at birth)
• Obscure african cardiomyopathy
• Primary cardiomyopathy

ICD-10-CM I42.8 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 314 Other circulatory system diagnoses with mcc
• 315 Other circulatory system diagnoses with cc
• 316 Other circulatory system diagnoses without cc/mcc

Convert I42.8 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I42.8:

• Becker’s
  • cardiomyopathy I42.8
• Cardiomyopathy (familial) (idiopathic) I42.9
  • newborn I42.8
  • non-ischemic I42.8 – see also by cause
  • obscure of Africa I42.8
  • specified NEC I42.8
• Collagenosis, collagen disease (nonvascular) (vascular) M35.9
  • cardiovascular I42.8
• Dysplasia – see also Anomaly
  • arrhythmogenic right ventricular I42.8
  • right ventricular, arrhythmogenic I42.8
• Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) I42.9 – see also Cardiomyopathy
  • obscure I42.8 (African)
• Newborn (infant) (liveborn) (singleton) Z38.2
  • affected by
    • cardiomyopathy I42.8
• South African cardiomyopathy syndrome I42.8
• Syndrome – see also Disease
  • South African cardiomyopathy I42.8