Any familial isolated dilated cardiomyopathy in which the cause of the disease is a mutation in the ABCC9 gene. The disease is MONDO_0012062 (dilated cardiomyopathy 1O). Also known as: ABCC9 familial isolated dilated cardiomyopathy, CMD1O, cardiomyopathy, dilated, type 1O, dilated cardiomyopathy type 1O, dilated cardiomyopathy with ventricular tachycardia, familial isolated dilated cardiomyopathy caused by mutation in ABCC9.