There exists a thread about South Dakota and health care for seniors. I have read the thread, not sure if it is this forum family or not but it is alarming, Seems that SD is one of the states fighting the affordable health care act and as a result for those on medicare (Which will soon include you folks) the add-on plans which fill the medi-gap and prescription coverage, choices are limited.
Now that said: Blue Cross is the one card that is known around the world, every state, every city every country knows Blue Cross.. SOME are participating providers (if you have the BC/Bs PPO option) some are not, but they all know how to bill Blue Cross.