Medicare is a specialized government program that provides health care insurance for elderly or disabled people with ages sixty five and older, which is a port of social security systems. The American Association of Retired Persons, or AARP, provides additional or supplementary insurance plans through different private insurance companies that help providing coverage on certain costs on health care that the main Medicare insurance does not or cannot cover. The AARP presents a set of Medicare supplement plans that offer additional benefits that are not usually covered by the main Medicare insurance issued by the government. The plans are offered by private insurance companies rather than the federal government. People with eligible ages and conditions are the ones only allowed to purchase any of the AARP Medicare supplement plans. Medicare supplement plans released by the AARP pay for the additional days beyond what Medicare can cover if you have to be confined in a medical facility. Such plans cover the remaining balances of the costs not taken up by Medicare including doctor visits, the first three pints of blood to be used, and fees for nursing homes or services. Several states in the United States have imposed regulations that tell how AARP Medicare supplement plans can operate and what are the benefits they can provide. In much simpler terms, private insurance companies provide Medicare Supplement Plans, but the government regulates them. AARP Medicare Supplement Plans are offered in different categories, in the same way that the main Medicare insurance plan is comprised of. There are twelve types of Medicare supplement plans from Plan A to Plan N, which exhibit different coverage, premium rates, and benefits. These categories differ in the cases, locations, and conditions of the coverage to be exacted for the recipient in order to cut down costs on the particular service to be covered. Since AARP Medicare Supplement Plans come in different categories or tiers, proper and thorough consideration must be done prior to the purchase of a supplement plan. It must be kept in mind that there are specific purposes and benefits in each Medicare supplement plan, so having the right supplement plan can save considerable amount of money and effort.