A coding auditor reviews and evaluates medical coding to ensure the accuracy of patient records and billing. As a coding auditor, your job duties include inspecting medical coding documents for errors, correcting mistakes, reporting repeated errors to management, conducting inquiries into departments that output a significant number of coding mistakes, and providing training and education to medical coding clerks. You need extensive knowledge of ICD-9 and CPT codes to make sure that the medical coding documents you review are accurate and that patients receive accurate bills for their medical services.