Transient neonatal diabetes mellitus (TNDM) is a genetically heterogeneous form of neonatal diabetes (NDM) characterized by hyperglycemia presenting in the neonatal period that remits during infancy but recurs in later life in most patients. The disease is transient neonatal diabetes mellitus (MONDO_0020525). Also known as: TNDM, transient neonatal diabetes mellitus (disease).