As a Medicare auditor, you review health insurance information and documentation to ensure accuracy and locate errors or discrepancies. Your duties include reviewing billing and claims processes to ensure healthcare and medical service providers abide by Medicare regulations. Your responsibilities often involve investigating errors in billing, problems with Medicare eligibility determinations, and possible cases of fraud. Some auditors focus on medical coding accuracy. In these positions, you review medical records to ensure that medical codes match services provided, and you determine whether the services or treatments were medically necessary. Auditors also review processes and make recommendations to improve efficiency.