Coding rules and payment policies can be very specific and a coder must be on top of his or her game to accurately report and obtain proper payment for anesthesia services. Developed by the authorities in anesthesia, the American Society of Anesthesiologists, the 2013 CROSSWALKr provides the CPTr anesthesia code that most specifically describes the anesthesia service for a particular diagnostic or therapeutic CPTr procedure code.