Any hypertrophic cardiomyopathy in which the cause of the disease is a mutation in the TTN gene. The disease is hypertrophic cardiomyopathy 9 (MONDO_0013412, a Monarch Disease Ontology entry). Also known as: CMH9, TTN hypertrophic cardiomyopathy, cardiomyopathy, familial hypertrophic, 9, cardiomyopathy, familial hypertrophic, type 9, hypertrophic cardiomyopathy caused by mutation in TTN, hypertrophic cardiomyopathy type 9.