I asked one of my Smarter Dx colleagues who's an expert on this subject to clarify, and he had this to say:
> There are 2 types of billing, even for hospitalized patients. FFS and DRG based payments. Fee For Service does depend on capturing those billing codes correctly. But DRG based payments depend solely on documentation and the billing codes are irrelevant. FFS is 2/3s of US health care spend currently ($2.6T) while DRG is $1.3T.