Medigap premiums for plans from insurance companies offering the same benefits vary widely, so it pays to be a smart shopper. Federal law requires that each insurance company offers the same benefits for each of the Medigap plans lettered A through M, but each company sets its own premium rates. A Medigap insurance company sets premiums in three ways: Community-rated, where the premiums are the same, regardless of age Issue or entry age-related, where premiums are cheaper if purchased at a younger age Attained-age-related, where premiums are based on your age at the time of purchase When choosing a Medigap plan, Continue Reading