HCPCS Code E0471: Respiratory Assist Device, Bi-Level Pressure Capability, With Back-Up Rate Feature, Used With Noninvasive Interface, e.g., Nasal or Facial Mask (Intermittent Assist Device With Continuous Positive Airway Pressure Device)

E0470 provides bi-level pressure only. E0471 adds a backup respiratory rate, making it appropriate for central sleep apnea and hypoventilation.

It is usually billed as a capped rental under Medicare, eventually converting to patient ownership after 13 months of continuous use.

Sleep labs for initial setups and periodic assessments of the patient. Since this is a rental device and can be owned after a certain amount of time, it's mostly used at the patient's residence.