CMS is hosting a Special Open Door Forum on June 17, 2014 to provide an overview regarding new Medicare prior authorization initiatives impacting durable medical equipment, prosthetics, orthotics and supplies (DMEPOS) suppliers and ambulance suppliers. Specifically, the call will cover the Medicare Expanded Prior Authorization Demonstration for Power Mobility Devices (PMDs) Demonstration, the Hyperbaric Oxygen and Repetitive Scheduled Non-Emergent Ambulance Transport prior authorization models, and a recent proposed rule to require prior authorization for certain DMEPOS.