In Germany, prehospital emergency response teams include physicians, but little is known about their performance with regard to diagnostic accuracy. In this retrospective observational cohort study, researchers analyzed diagnoses made by a German prehospital emergency medical service in 2004 and in 2014. For each patient meeting inclusion criteria, they compared the prehospital diagnosis with the diagnosis made in the hospital and found that diagnostic accuracy improved by more than 5% in 2014 compared to 2004.