Cigna offers many Medicare supplement plans, however their Medicare supplement plan g is the by far the plan that has the most value. Plan G is 1 of 10 standardized Medigap plans offered by private insurance companies. The only benefit plan G does not cover is the Part B deductible, which is $166 in 2016. Other than that it exactly the same as plan F.
The main reasons to get a plan G over a plan F is that the rate increases tend to be a lot lower on plan G. The average rate increase for plan f is about 10 percent per year. Plan G increases at about 5 percent per year.