Currently, we are an anesthesia group that provides anesthesia and interventional pain management services. All billing is done under that corporation's tax ID, NPI, etc. What are the disadvantages to creating a separate corporation, complete with its own tax ID, NPI, and separate contractual arrangements,etc. that would be dedicated to the pain management portion of our practice? Other than the paperwork of setting it up, I only see benefits. Am I missing something? Any input would be greatly appreciated.