Some managed medicare reviewers will deny the second MBB if its REQUESTED too soon. Had to appeal (via letter cuz these chuckleheads don't allow P2P) because we generally do 2 day follow-ups for our MBBs and schedule the block 2 weeks after the first...they denied because we requested at 10 days after the first injection instead of 14...and we didn't even receive the denial until 15 days after the injection...