This book uses the Official Coding Guidelines effective October 1, 2016 through September 30, 2017. Most textbooks simply reprint the ICD-10-CM coding guidelines but don't explain them. This book translates these confusing guidelines into simple English. The guidelines are then formatted into charts so students or working coders can find the code they need easily and quickly. ALSO AVAILABLE ON AMAZON - ICD-10-CM External Cause Coding Made Easy.