(1) "Prosthetic devices" means replacement, corrective, or supportive devices or appliances which artificially replace a missing portion of the body to:

(a) prevent or correct physical deformity or malfunction; or

(b) support a weak or deformed portion of the body.

(2) "Durable medical equipment" means the most economical and medically necessary equipment appropriate for use in a patient's home or residence, including, but not limited to, wheelchairs, walkers, canes, crutches, hospital beds, oxygen equipment, and sickroom equipment.

(3) "Medical supplies" means disposable or nonreusable medical supplies, including, but not limited to, splints, bandages, and oxygen.

(4) "Prior authorization" means the Medicaid program's review and approval of an item's medical necessity and coverage by Medicaid prior to the delivery of the item.