Monarch Disease Ontology identifier MONDO_0019607 (unspecified juvenile idiopathic arthritis) is a rare, pediatric, rheumatologic disease, a subtype of juvenile idiopathic arthritis (JIA) characterized by arthritis of an unknown cause that persists for at least 6 weeks, and does not fulfill the criteria for any of the other JIA subtypes, or fulfills criteria for more than one of the other subtypes. Also known as: unspecified JIA.