United States. Congress, America's Affordable Health Choices Act of 2009…
“ In general.—The Secretary shall establish a process to validate relative value units under the fee schedule under subsection (b) . `` (ii) Components and elements of work.—The process described in clause (i) may include validation of work elements (such as time, mental effort and professional judgment, technical skill and physical effort, and stress due to risk) involved with furnishing a service and may include validation of the pre, post, and intra-service components of work. ”
