According to a recent study,

25% of all U.S. hospital spending consists of administrative costs, compared to 20% in the Netherlands, 16% in England and 12% in Canada.
Source: "A comparison of hospital administrative costs in eight nations: US costs exceed all others by far," The Commonwealth Fund, http://www.commonwealthfund.org/publications/in-the-literature/2014/sep/hospital-administrative-costs