I42.0 – Dilated cardiomyopathy

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Non-billable header Expanded in 2027

ICD-10-CM code I42.0

Code: I42.0 (claims format: I420)
Description: Dilated cardiomyopathy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I30-I5A Other forms of heart disease
Parent codes: I42

Billable codes under I42.0

I42.0 is a header code and cannot be used on claims. Choose the most specific code:

I42.00 – Dilated cardiomyopathy, unspecifiedBillable · New in 2027
I42.01 – Familial-genetic dilated cardiomyopathyBillable · New in 2027
I42.09 – Other dilated cardiomyopathyBillable · New in 2027

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I42 – Cardiomyopathy

Includes:

myocardiopathy

Excludes2 (not included here):

ischemic cardiomyopathy (I25.5)
peripartum cardiomyopathy (O90.3)
ventricular hypertrophy (I51.7)

Code first:

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

Related codes in I42

I42.1 – Obstructive hypertrophic cardiomyopathyBillable
I42.2 – Other hypertrophic cardiomyopathyBillable
I42.3 – Endomyocardial (eosinophilic) diseaseBillable
I42.4 – Endocardial fibroelastosisBillable
I42.5 – Other restrictive cardiomyopathyBillable
I42.6 – Alcoholic cardiomyopathyBillable
I42.7 – Cardiomyopathy due to drug and external agentBillable
I42.8 – Other cardiomyopathiesHeader
I42.9 – Cardiomyopathy, unspecifiedBillable

Frequently asked questions

What is ICD-10 code I42.0?

I42.0 is the ICD-10-CM code for dilated cardiomyopathy, in the block I30-I5A (Other forms of heart disease).

Is I42.0 a billable code?

No. I42.0 is a header code with more specific child codes; report one of the billable codes listed above.

What category does I42.0 belong to?

It belongs to category I42 – Cardiomyopathy.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.