I42Cardiomyopathy

I42 is the ICD-10-CM diagnosis code for cardiomyopathy. It belongs to block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I42.0 (cardiomyopathy), I42.1 (cardiomyopathy), I42.2 (cardiomyopathy), I42.3 (disease), I42.4 (fibroelastosis), I42.5 (cardiomyopathy), I42.6 (cardiomyopathy), I42.7 (due to drug and external agent) and 2 more.

The conditions in its Excludes2 note aren't part of I42, but may be coded alongside it if the patient has both: ischemic cardiomyopathy (I25.5), peripartum cardiomyopathy (O90.3) and ventricular hypertrophy (I51.7).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.