When a doctor prescribes a wheelchair, a walker or a home oxygen setup, Medicare Part B picks up 80 percent of the approved cost and leaves the beneficiary responsible for the other 20 percent. That split turns equipment that can carry list prices in the hundreds or thousands of dollars into a far smaller out-of-pocket bill for older Americans on fixed incomes. The catch is that the arithmetic only holds when a few conditions are met, and the pieces most retirees overlook are the yearly deductible and the question of whether the supplier plays by Medicare’s rules.
How the 80 Percent Split Actually Works
Part B treats mobility aids and breathing equipment as durable medical equipment, the category for items built to withstand repeated use in the home. Once a beneficiary has met the annual Part B deductible, Medicare pays 80 percent of the approved amount and the beneficiary pays the remaining 20 percent coinsurance.
That 20 percent is not a flat fee. It is a percentage of whatever Medicare has decided the item is worth, so the dollar figure rises and falls with the equipment. A basic walker generates a small coinsurance charge; a power wheelchair produces a larger one. Either way, the beneficiary is shielded from the full retail sticker because Medicare, not the supplier, sets the approved amount.
The deductible matters because it resets every calendar year. A retiree who has not yet used Part B services in a given year pays that amount first, then moves to the 20 percent share on everything after. For someone who buys equipment early in January, the first purchase absorbs the deductible before the 80/20 math begins.
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Which Items Qualify, and What a Doctor Must Do First
The coverage reaches a wide range of home equipment. Medicare lists walkers, including rollators, alongside canes and commode chairs, and covers manual and power wheelchairs and scooters when a beneficiary cannot safely get around the home without them. Home oxygen equipment and accessories fall under the same benefit, covering the machine, tubing and related supplies for those with a qualifying respiratory condition.
Nothing is covered on the strength of a beneficiary’s request alone. A doctor or other treating provider has to certify that the equipment is medically necessary, and that order is what unlocks the benefit. For power wheelchairs and scooters, Medicare often requires a face-to-face exam and documentation showing the person cannot manage daily activities in the home with a cane or walker.
Oxygen carries its own structure. Rather than buying the machine outright, most beneficiaries rent it, and Medicare frames the payments as a rental arrangement with the supplier handling maintenance. The 20 percent coinsurance still applies, but it is spread across the rental period instead of landing as one large purchase.
Where the Bill Can Quietly Grow
The single biggest variable is whether the supplier accepts assignment. A supplier that participates in Medicare and takes assignment agrees to the approved amount as full payment, so the charge is limited to the coinsurance and any unmet deductible. A supplier that does not accept assignment can bill more, and that gap comes straight out of the beneficiary’s pocket on top of the 20 percent.
Medicare also runs a competitive bidding program in many areas, meaning beneficiaries generally have to use contracted suppliers for certain equipment to keep the coverage. Using a wheelchair or scooter supplier outside that arrangement in an affected region can leave a beneficiary paying the entire cost. Confirming that a supplier is enrolled in Medicare and accepts assignment before the equipment is ordered is the step that protects the 80/20 split.
For retirees weighing a purchase, the practical takeaway is that Medicare’s share is generous but conditional. The 80 percent is real, yet it depends on a valid physician order, a qualifying medical need and a supplier operating inside Medicare’s rules. Miss any of those, and the same wheelchair or oxygen concentrator that should have cost a fraction of retail can arrive with a bill that swallows a month’s budget.
This article was researched and drafted with the assistance of artificial intelligence.
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