Billing for medical services is never easy. Despite attempts by the Centers for Medicare & Medicaid Services (“CMS”) to simplify the rule regarding “incident to” billing for Medicare services, it remains misunderstood by a large swath of providers. This proves problematic, as incorrect billing practices may lead to overpayments and False Claims Act violations. Billing for “incident to” services is an important mechanism to reflect the actual value of mid-level services provided under the specific plan of a physician. When properly followed, the “incident to” rules allow physicians to bill for services provided by non-physician practitioners as if they were performed by the physician at physician reimbursement rates. Additionally, the non-physician provider can be an employee, an independent contractor or even a leased employee, provided that they are supervised by a physician and the requirements are met. Because of the confusing nature of allowing a physician to bill for services he or she did not directly provide to the patient, serious landmines exist that can create problems if the rules are not scrupulously followed and documented.