Details matter when it comes to avoiding a denial. Although at first glance, you'll probably think these revised codes haven't changed much, the devil is in the details as they say. If you think some of these codes only describe "permanent" catheters, for instance, you could be setting yourself up for a headache down the road. Post this chart at your desk, and you'll begin to understand the minute differences between the 2010 and 2011 descriptors.