Blue Cross Blue Shield does cover diabetic shoes as long as the diabetic shoes you are getting meet the medical criteria that is stipulated by Blue Cross and Blue Shield.
As long as the diabetic shoes meet the medical criteria of Blue Cross and Blue Shield then they will cover the cost of medically required diabetic shoes.
Most other health insurance will also help to cover the cost of diabetic shoes and it's very likely that you would get the diabetic shoes covered by health insurance as well as Blue Cross and Blue Shield.
Diabetic Shoes must also be fitted by your doctor to get the proper fit so that they won't cause any other health issues.