Mistakes during MAC audits happen. Whether due to a lack of understanding of the Medicare rules and regulations that apply, misapplication of the relevant rules and regulations, a mistaken understanding of auditing procedures and methodologies, or an overzealous attempt to uncover overbillings in order to recover contingency fees from CMS – MAC auditors make mistakes that can lead to significant consequences for healthcare providers. At Oberheiden, P.C., we know the types of mistakes auditors tend to make, and our goal is to spot these mistakes quickly and before they lead to unfavorable audit determinations.