MC pays for a new and necessary appliance once every 5 years; either a walker or a wheelchair. The doc writes the script and the MC approved company delivers it to your door.
The 80% only comes into the picture when it has to do with health, like doctor and hospital visits. Hopefully the supplimental will pick up the other 20%. Some supplimentals cover durable equipment.
What is the age of your mom’s current rollater? They nurse or doctor will order it for you and ship it straight to your door.