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 (BiPAP) capability, WITH backup rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device)
E0472 Respiratory assist device, bi-level pressure (BiPAP) capability, WITH backup rate feature, used with invasive interface, e.g., tracheostomy tube (intermittent assist device with continuous positive airway pressure device)
E0561 Humidifier, non-heated, used with positive airway pressure (CPAP/BiPAP/APAP) device
E0562 Humidifier, heated, used with positive airway pressure (CPAP/BiPAP/APAP) device

CPAP/BiPAP MASK CODES

A7030 Full Face Mask used with Positive Airway Pressure (CPAP/BiPAP/APAP) Device
A7034 Nasal interface (mask or cannula type) used with positive airway pressure (CPAP/BiPAP/APAP) device , with or without headstrap
A7044 Oral interface used with positive airway pressure (CPAP/BiPAP/APAP) device
K0553 Combination oral/nasal mask, used with continuous positive airway pressure device

CPAP/BiPAP PART & ACCESSORY CODES

A7032 Replacement Cushion for Nasal or Full Face Mask
A7033 Replacement Pillows for Nasal Mask
A7035 Headgear used with positive airway pressure device
A7036 Chinstrap used with positive airway pressure device
A7037 Tubing used with positive airway pressure device
A7038 Filter, disposable, used with positive airway pressure device
A7039 Filter, non-disposable (reusable), used with positive airway presssure device
A7045 Exhalation port with or without swivel used with accessories for positive airway pressure devices
A7046 Water chamber for humidifier, used with positive airway pressure device
E1399 Miscellaneous Durable Medical Equipment Items, Components and Accessories
K0554 Oral cushion for combination oral/nasal mask
K0555 Nasal pillows for combination oral/nasal mask