“Assigned” means a supplier (i.e., Health-E-Quip) accepts the Medicare-approved fee for a piece of equipment it is called an “assigned” item. Medicare pays the supplier 80 percent of the approved fee. The beneficiary pays the 20 percent coinsurance.
A “Non-Assigned” item means the supplier determines the charge for the piece of equipment. The beneficiary pays the supplier. The supplier submits the claim to Medicare. If the item meets coverage requirements Medicare reimburses the beneficiary 80 percent of the approved fee.
CMN or Certificate of Medical Necessity is required by Medicare from your physician to certify the need for specific equipment.
ABN or Advanced Beneficiary Notice basically notifies Medicare and the patient that specific equipment may not be covered due to lack of qualifying information. The patient is then made aware that they will have to pay if Medicare does not cover under these circumstances.