Medical expenses are the costs of diagnosis, cure, mitigation, treatment, or prevention of disease , and for the purpose of affecting any part or function of the body. These expenses include payments for legal medical services rendered by physicians, surgeons, dentists, and other medical practitioners. They include the costs of equipment, supplies, prescription drugs and diagnostic devices needed for these purposes. Also included is needed travel costs. They include the costs of insurance and deductibles paid by the taxpayer that pays for medical expenses.
To be a part of itemized deductions the out of pocket medical expenses must be more than 7.5% of adjusted gross income.
The wheelchair and walker are deductible medical expenses. As for "various other items," it depends on what the items are. Many medical devices and supplies are deductible, but there is no fixed list of items that are deductible. You might find IRS Publication 502, Medical and Dental Expenses, helpful. It describes many items that are or are not deductible as medical expenses.
Only medical expenses in excess of 7.5% of your Adjusted Gross Income (AGI) are deductible. (In TurboTax enter the full amount that you paid. TurboTax will subtract 7.5% of your AGI from the total.) In addition, medical expenses are an itemized deduction. They will not reduce your tax or increase your refund unless your total itemized deductions are more than your standard deduction.