I42 ICD-10-CM Code: Cardiomyopathy
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
I42Cardiomyopathy
ICD-10-CM diagnosis code · United States clinical modification
Where I42 sits
- 1
Chapter 9
Diseases of the circulatory system (I00-I99)
- 2
Section
Other forms of heart disease (I30-I5A)
- 3
Category I42
Cardiomyopathy
- 4
Code I42
Cardiomyopathy
Codes under I42
I42 is a non-billable category. Choose the child code that best matches the documented diagnosis.
I42.0Dilated cardiomyopathyI42.1Obstructive hypertrophic cardiomyopathyI42.2Other hypertrophic cardiomyopathyI42.3Endomyocardial (eosinophilic) diseaseI42.4Endocardial fibroelastosisI42.5Other restrictive cardiomyopathyI42.6Alcoholic cardiomyopathyI42.7Cardiomyopathy due to drug and external agentI42.8Other cardiomyopathiesI42.9Cardiomyopathy, unspecifiedNotes for this code
Inclusion terms
No inclusion terms are listed for I42.
Code first
- pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Use additional code
No “use additional code” instruction is listed for I42.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for I42.
Excludes2
Conditions not included here that may be reported separately when present.
- ischemic cardiomyopathy (I25.5)
- peripartum cardiomyopathy (O90.3)
- ventricular hypertrophy (I51.7)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code I42 mean?
I42 is the FY 2027 U.S. ICD-10-CM code for “Cardiomyopathy.”
Is I42 a billable or specific ICD-10-CM code?
No. I42 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is I42 located in ICD-10-CM?
I42 is listed in Chapter 9, Diseases of the circulatory system (I00-I99), within Other forms of heart disease (I30-I5A) (I30–I5A), under category I42, Cardiomyopathy.
What coding notes are listed for I42?
No inclusion terms are listed for I42 in this reference record. Code-first instructions: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4). No Excludes1 note is listed. Excludes2 notes: ischemic cardiomyopathy (I25.5); peripartum cardiomyopathy (O90.3); ventricular hypertrophy (I51.7).