The eleventh edition of the publication «Key data on Swiss hospitals» again contains data for every hospital. Article 59a of the Health Insurance Act, which came into force on 1 January 2016 (previously article 22a of the Health Insurance Act), together with Article 31 of the Health Insurance Ordinance, provide the legal basis for this publication. The figures are based on the Hospital Statistics and the Medical Statistics of Hospitals for 2015 from the Federal Statistical Office (FSO). They give an overview of the hospitals' structure, patients, capacity, services offered, personnel and financial situation, as well as the average severity of illness of hospitalised acute patients.