(NEWSER) – The charges on US hospital bills often seem entirely random and inconsistent, and now we know why: they probably are. The government has released datatoday on what 3,300 different hospitals charge for the 100 most common procedures. The results show massive variation, reports the Washington Post. One DC hospital charges $115,000 to put a patient on a ventilator, while another in the same city charges $53,000. Nationwide it's even crazier: $5,304 for a joint replacement at one hospital in Oklahoma compared with $223,373 for one in California.