Don’t even crack your code book unless you’ve done the following three things: Number 1 – Make sure that your ICD-9 codes book is from the current billing year. New codes are issued on October 1st of every year. Make that your Medical Billing New Years and put up the previous year’s code book to ensure that you don’t make a mistake and code from the incorrect set of codes. Number 2 – State by reviewing the diagnostic statements and make yourself a side list choosing the conditions you need to code in order to make sure you don’t miss anything when you’re choosing the proper ICD-9 codes. Number 3 …