You don't have to do it by going into the provider's office or by reading thru all the eobs. You could do it by working off of the provider's aging report, as long as the report gives you enough info. Or you can have the provider have someone print off cms forms (just on blank paper, not on forms - to save $) for any outstanding claims.
Sometimes we do work off of their eobs if they have a lot of denials, or if one particular insurance carrier is the problem. You usually don't need to go thru them all, you can get a feel for what is going wrong and what needs to be done by looking at a couple of the denials.
But if they are losing a lot of money, they need someone to figure out why, and if that someone is you that is great. In addition to that, if you can get the outstanding claims paid and increase their receivables that is even better.
Michele