I42
⚠ Non-billable
Cardiomyopathy
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I42
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Includes
- myocardiopathy
Excludes2 — not included here, but may code together
- ischemic cardiomyopathy (I25.5)
- peripartum cardiomyopathy (O90.3)
- ventricular hypertrophy (I51.7)
Code first
- pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Frequently asked questions
What is ICD-10 code I42?
ICD-10-CM code I42 represents Cardiomyopathy. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I42 billable?
No. I42 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is I42 in?
I42 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I42 category
I42.0
Dilated cardiomyopathy
Non-billable
I42.1
Obstructive hypertrophic cardiomyopathy
Billable
I42.2
Other hypertrophic cardiomyopathy
Billable
I42.3
Endomyocardial (eosinophilic) disease
Billable
I42.4
Endocardial fibroelastosis
Billable
I42.5
Other restrictive cardiomyopathy
Billable
I42.6
Alcoholic cardiomyopathy
Billable
I42.7
Cardiomyopathy due to drug and external agent
Billable
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