One of things carriers look for to open negotiations is marketability from their prospective.. they like provider's who have a service other providers in the area may not have, they look at that first. That's just ONE of things they look to first before negotiations. There are carriers who "across the board" will NOT negotiate in certain areas, this is where the attorney really is needed and not just to go over the contracts, as they can determine if a carrier is within their right to NOT negotiate based on geographic location, services, etc. A LOT goes into credentialing at this level.. if you decide to do it you need to really charge a decent fee to recoup your time. It's a lot of work but it can also be a great service to your larger providers. (I don't normally do this for solo or very small specialty groups as they often don't want to pay the higher fees to do so)