Medical errors (administrative errors) are the 3rd leading cause of death in the USA, trailing only to heart disease and cancer. My own experience confirms this. My cancer diagnosis was handled badly leading to a two year insurance battle. During a 26 hour hospital emergency visit I recall catching at least 3 administrative errors. I choose my doctor now based on their administrative staff.
http://www.consumerreports.org/cro/magazine/2014/05/survive-your-hospital-stay/index.htm