A disease that has its basis in the disruption of type IV hypersensitivity. The disease is type IV hypersensitivity disease (MONDO_0002459, a Monarch Disease Ontology term). Also known as: DTH, delayed hypersensitivity reaction, delayed-type hypersensitivity, delayed-type hypersensitivity response, disorder of type IV hypersensitivity, type 4 hypersensitivity reaction, type IV hypersensitivity, type IV hypersensitivity reaction.