Common HCPCS codes for PAP devices and supplies

HCPCS codes are what suppliers use to bill insurers. Knowing them helps you read an explanation of benefits or a supplier invoice.

Code	What it covers	Group
E0601	Continuous positive airway pressure (CPAP) device, including auto-adjusting single-level CPAP	Machine
E0470	Bilevel respiratory assist device without backup rate	Machine
E0471	Bilevel respiratory assist device with backup rate	Machine
E0561	Humidifier, non-heated, used with PAP device	Humidifier
E0562	Humidifier, heated, used with PAP device	Humidifier
A7046	Water chamber for humidifier, replacement	Humidifier
A4604	Tubing with integrated heating element	Tubing
A7037	Tubing used with PAP device	Tubing
A7030	Full face mask	Mask
A7031	Full face mask replacement cushion	Mask part
A7034	Nasal interface (mask or cannula type), with or without head strap	Mask
A7032	Nasal mask replacement cushion	Mask part
A7033	Nasal pillows replacement, per pair	Mask part
A7027	Combination oral/nasal mask	Mask
A7028	Oral cushion for combination oral/nasal mask, replacement	Mask part
A7029	Nasal pillows for combination oral/nasal mask, replacement, per pair	Mask part
A7044	Oral interface used with PAP device	Mask
A7035	Headgear used with PAP device	Accessory
A7036	Chinstrap used with PAP device	Accessory
A7038	Filter, disposable	Filter
A7039	Filter, non-disposable	Filter
A9279	Monitoring feature or device; Medicare lists it as statutorily non-covered	Monitoring

Notes

Descriptions are plain-English summaries of the official HCPCS descriptors.
Replacement frequencies for these codes are in the Medicare PAP supply replacement schedule table.
Suppliers contact the PDAC (Pricing, Data Analysis and Coding contractor) for coding questions about specific products.

Most problems come down to the mask, the humidity or a leak. Work through the fixes, starting with the easiest.