To go from the nine ASC payment groups you've grown to know and love - or loathe - to Medicare's Ambulatory Payment Classification (APC) system, you'll need to transform your business office, a process that could take weeks and easily cost $50,000 for the software, reference materials and training you'll need to make it happen. Here's a look at the tools you should have in place before the new payment system goes into effect, presumably, on Jan. 1.