The codified insurance info came from Version 7. I thought it was a godsend given all the different ways my staff spelled various insurance companies. Blue Cross was the BIG exception. (There are a few others but...) Most of your BCBS will go to your regional system. Those out of the system can be sent to the regional system and will be dealt with by them through some sort of interagency cooperation.
One of the problems I discovered was that some were BC HMO and were listed as PPO. Thus, Each one needed to be individually verified. Most of the others, we were able to migrate and it went relatively quickly.