It is no surprise then that a majority of American doctors say that generating bills and collecting payments is a major problem. Canadian practices spend only 27 percent of what U.S. ones do on dealing with payers like Medicare or private insurers.

Another study in Health Affairs surveyed physicians and physician practice administrators about billing tasks. It found that doctors spend about three hours per week dealing with billing-related matters. For each doctor, a further 19 hours per week are spent by medical support workers. And 36 hours per week of administrators’ time is consumed in this way. Added together, this time costs an additional $68,000 per year per physician (in 2006). Because these are administrative costs, that’s above and beyond the cost associated with direct provision of medical care.

In JAMA, scholars from Harvard and Duke examined the billing-related costs in an academic medical center. Their study essentially followed bills through the system to see how much time different types of medical workers spent in generating and processing them.

At the low end, such activities accounted for only 3 percent of revenue for surgical procedures, perhaps because surgery is itself so expensive. At the high end, 25 percent of emergency department visit revenue went toward billing costs. Primary care visits were in the middle, with billing functions accounting for 15 percent of revenue, or about $100,000 per year per primary care provider.

“The extraordinary costs we see are not because of administrative slack or because health care leaders don’t try to economize,” said Kevin Schulman, a co-author of the study and a professor of medicine at Duke. “The high administrative costs are functions of the system’s complexity.”

Costs related to billing appear to be growing. A literature review by Elsa Pearson, a policy analyst with the Boston University School of Public Health, found that in 2009 they accounted for about 14 percent of total health expenditures. By 2012, the figure was closer to 17 percent.

One obvious source of complexity of the American health system is its multiplicity of payers. A typical hospital has to contend not just with several public health programs, like Medicare and Medicaid, but also with many private insurers, each with its own set of procedures and forms (whether electronic or paper) for billing and collecting payment. By one estimate, 80 percent of the billing-related costs in the United States are because of contending with this added complexity.