apply, and plans may not be cancelled by the insurer for any reason other than non-payment of premiums/membership dues. Furthermore, a single Medigap plan may cover only one person but may offer spousal discounts. Finally, Medigap insurance is not compatible with a Medicare Advantage plan. You cannot have both a Medicare Supplement and a Medicare Advantage plan at the same time. You can only have a Medigap plan if you are still on Medicare Part A and Part B and have not replaced your coverage with a Medicare Advantage Part C coverage. Medicare recipients under age 65 Recipients of Social Security Disability Insurance (SSDI) benefits or patients with end-stage renal disease (ESRD) are entitled to Medicare coverage regardless of age, but are not automatically entitled to purchase Medigap policies unless they are at least 65. Under federal law, insurers are not required to sell Medigap policies to people under 65, and even if they do, they may use medical screening. However, a slight majority of states require insurers to offer at least one kind of Medigap policy to at least some Medicare recipients in that age group. Of these states, 25 require that Medigap policies be offered to all Medicare recipients. In California, Massachusetts, and Vermont, Medigap policies are not available to ESRD patients. Products available Medigap offerings have been standardized by the Centers for Medicare and Medicaid Services (CMS) into ten different plans, labeled A through N, sold and administered by private companies. Each Medigap plan offers a different combination of benefits. The coverage provided is roughly proportional to the premium paid. However, many older Medigap plans (these 'older' plans are no longer marketed) offering minimal benefits will cost more than current plans offering full benefits. The reason behind this is that older plans have an older average age per person enrolled in the plan, causing more claims within the group and raising the premium for all members within the group. Since Medigap is private insurance and not government sponsored, the rules governing the sale and offerings of a Medigap insurance policy can vary from state to state. Some states such as Massachusetts, Minnesota, and Wisconsin require Medigap insurance to provide additional coverage than what is defined in the standardized Medigap plans. Some employers may provide Medigap coverage as a benefit to their retirees. While Medigap offerings have been standardized since 1992, some seniors who had Medigap plans prior