Now with April 2020 changes This book takes the confusing, dense coding guidelines and translates them into plain English. The guidelines are then placed into tables for easy reference. It was developed by a coding instructor, with many years of teaching experience, who was frustrated by textbooks that printed the guidelines but didn't explain them. The book is designed as a supplement to coding textbooks and as a reference for coding professionals. This book includes the official coding guidelines effective October 1, 2019. See also books by Ms. Tropin on E/M coding, PCS coding and external causes.