Unfortunately that is an answer that an insurance agent can give. It all depends on the exact procedure, why it is being performed, where it is being performed and how the billing department codes the bill to Medicare. Medicare pays the claims based on these codes and this information and approves according to a schedule. Without knowing the codes it is impossible to give a correct answer.
You can check out healthcarebluebook dot com as a resource and get an idea of fees.
You can also Google Medicare DRG rates or Medicare payment schedule for information