The Office of Inspector General (OIG) is a department in the US federal government (the HHS) that is responsible for combating health care and Medicaid fraud. The OIG maintains an exclusion list, known as the LEIE or the List of Excluded Individuals and entities, which is continuously updated to include those who have abused or taken advantage of Medicare & Medicaid programs.
Any individual or entity listed on the LEIE cannot participate as a healthcare provider in any healthcare program funded by the federal government. A healthcare provider who is listed as an excluded individual in the OIG exclusion list and still practices medicine or any other form of healthcare can be fined, and sentenced with severe criminal charges. OIG excluded individuals and entities can include MDs, PAs, RNs, LPNs, CNAs, and therapists, among a host of others.