I don't understand what you mean by blanket approach??
I can tell you that providers will contract with specialty providers (DME, Labs etc) and close out to other providers. We are a DME vendor, and the major payers, BCBSNC, Cigna, UHC, have contracted DME providers and WILL NOT ACCEPT any more. They are closed and this limits clients from going to where they want to. We get told all the time, we are not in net work,and I always reply YOU ARE NOT ACCEPTING PROVIDERS!! So we have to collect from your clients and we charge them the full cost. Seems like you will need a good collections team to get the money from the clients.