[yummyfajitas]

A quick google search suggests that emergency care makes up less than 3% of medical spending in the US. So negotiation and price comparison is possible for about 97% of medical spending.

http://www3.acep.org/patients.aspx?id=25902

[tptacek]

You're excluding the cost of inpatient care, which is not the same as Daniel Markham's anti-apnea sleep mask.