CMS intends to conduct a three-year Medicare prior authorization model for non-emergent hyperbaric oxygen therapy services in Illinois, Michigan, and New Jersey, where CMS contends there have been high rates of improper payments for these services. Under this model, CMS will require that all relevant clinical or medical documentation requirements are met before services are rendered to beneficiaries and before claims are submitted for payment; no new clinical documentation requirements will be created. The model is scheduled to begin on March 1, 2015.  CMS also recently announced a similar prior authorization model for repetitive scheduled nonemergent ambulance transports.