Medicare Supplement company
Blue Cross Blue Shield affiliates
Source: Medicare.gov and company information · Compiled October 29, 2026
What this company offers
There is no single national Blue Cross Blue Shield Medigap company. Medigap policies under this name are sold by independent local Blue Cross Blue Shield companies, one for each state or region. The company that sells in your state is the one whose plans you would compare.
Plan letters
Blue Cross Blue Shield affiliates does not have to offer every plan letter, and the letters it sells vary by state. Any company that sells Medigap policies must offer Plan A. Massachusetts, Minnesota, and Wisconsin use their own plan designs, so the standard letters do not apply in those states.
Plans C and F can only be sold to people who were first eligible for Medicare before January 1, 2020.
How a Medigap plan works
A Medicare Supplement plan works with Original Medicare. You must have Part A and Part B. Medicare pays its share first. Then the supplement plan pays its share of the costs Medicare left behind, based on the letter you chose.
These plans do not include prescription drug coverage. For drug coverage, add a separate Part D plan: Medications and drug coverage.
A Medigap plan cannot be used with a Medicare Advantage plan. If you are weighing the two paths, start here: Medicare Advantage plans.
Every plan with the same letter covers the same benefits, from every company. What differs is the price and the company. See what each letter covers: Medicare Supplement plans, explained.