Imu posted this list at apneasupport.com but it seemed worth "borrowing" the list and posting it here.
CPAP/BiPAP MACHINE CODES
E0601 Continuous airway pressure (CPAP/APAP) device
E0470 Respiratory assist device, bi-level pressure (BiPAP) capability, WITHOUT backup rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device)
E0471 Respiratory assist device, bi-level pressure… Continue