Medicare Supplement Plans, All equally accepted on the road?

We have BCBS but don't do much with the doctors side on the road but using WALMART for Pharmacy for the pills is great. They are all connected together through their business network so having the pills sent to WALMART Pharmacy works for us for getting refills etc They find our local pharmacy account with just click click...

CVS Pharmacy is another store that is all over the country too...

Roy Ken