I42 – Cardiomyopathy
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I42
- Code
I42(claims format:I42)- Description
- 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
Billable codes under I42
I42 is a header code and cannot be used on claims. Choose the most specific code:
- I42.0 – Dilated cardiomyopathyHeader (more codes below)
- 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 (more codes below)
- I42.9 – Cardiomyopathy, unspecifiedBillable
Notes for I42
Includes:
- myocardiopathy
Excludes2 (not included here):
Code first:
- pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Frequently asked questions
What is ICD-10 code I42?
I42 is the ICD-10-CM code for cardiomyopathy, in the block I30-I5A (Other forms of heart disease).
Is I42 a billable code?
No. I42 is a header code with more specific child codes; report one of the billable codes listed above.
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.