First, you cannot usually qualify for Medicare until you reach age 65. However, if you qualify due to a disability, the cost will depend on a couple of factors. You can qualify for premium-free Part A coverage if you have enough work credits. Part B includes a monthly premium, which is $164.90 in 2023. If your income is higher, your premium might increase. You can use Medicare’s premium calculator to see how much your premium will be. If you sign up for a Medicare Supplement plan or other private insurance, the cost will depend on your specific plan.