Medicare doesn’t usually cover humidifiers or other similar items, like room heaters, dehumidifiers, or electric air cleaners.
However, when medically necessary, Medicare covers oxygen humidifiers used with certain covered durable medical equipment (DME), like continuous positive airway pressure (CPAP) devices, respiratory assist devices, or oxygen equipment.
Your costs in Original Medicare
You pay 100% for most room humidifiers or other similar items. If it’s medically necessary, you won’t have to pay a separate amount for an oxygen humidifier. The monthly fee for your oxygen equipment will include the cost of an oxygen humidifier.
You pay 20% of the Medicare-approved amount to rent or purchase a humidifier that's used with a CPAP device or a respiratory assist device.