I51.8 Other ill-defined heart diseasesNon-billable header with 2 child codes.
I51.2 Rupture of papillary muscle, not elsewhere classifiedI51.3 Intracardiac thrombosis, not elsewhere classifiedI51.4 Myocarditis, unspecifiedI51.5 Myocardial degenerationI51.7 CardiomegalyI51.8 Other ill-defined heart diseases (this code)I51.81 Takotsubo syndromeI51.89 Other ill-defined heart diseasesI51.9 Heart disease, unspecified