They do for certain diagnostic and lab services. The problem with healthcare service is that it's not some off-the-shelf product - you don't know what level of

They do for certain diagnostic and lab services. The problem with healthcare service is that it's not some off-the-shelf product - you don't know what level of work you need going in, and the need for more services may be uncovered later. Giving a price guarantee on something that changes based on the service being done isn't as feasible, especially when coverage changes depending on diagnosis codes.