Medicare MSA Plans combine a high-deductible insurance plan with a medical savings account that may be used to pay for medical expenses. Money is deposited into your account by the Medicare MSA Plan. You can use money from this savings account to pay for medical expenses before you reach your deductible. These accounts make it possible to save money for future health needs while still covering the most important health care costs today. There are two types of Medicare MSAs: HMOs and PPOs. With an HMO, your doctor or hospital must be part of its network to receive reimbursement. This means that you will need to get approval from your insurer to see what doctors are in its network. If your provider is not in its network, you will not be able to see them. A PPO gives you freedom to choose any physician within its network. There is no requirement to seek approval from your carrier to see any doctor or facility. Both HMOs and PPOs allow you to put money into your account each month. This creates a pool of money that can be drawn upon for future medical bills. Because of the high deductibles involved, it is important to file your taxes on time so that all of the money that has been set aside can be deducted from your income. Medicare MSAs are offered through private insurers as well as corporate alliances between health maintenance organizations (HMOs) and preferred provider organizations (PPOs).