Medical Coders must be able to read a patient's medical record and understand the specialized terminology used. It requires a familiarity with anatomy and physiology, as well as how and why procedures are performed. Knowing all the in's and out's of the procedure will help when it's time to determine the appropriate ICD-10 code. Having more information than not will eliminate the need to ask questions and dig into the medical record even more. Not sure how a particular procedure is performed? Chances are the provider left it off their notes.