Hi all, I've spent the day poring through Medicare sites to no avail. This is one of those questions that has a logical answer, but I'm looking for a source to document that the answer is correct. A physician billing for ESI usually has two component bills...one CMS bill for provider fees, and one UB for facility fees where the injection was performed. If a physician happens to do an ESI in his office, I understand the POS would show as 11. Is there anything in writing somewhere that he doesn't also get to add a "facility fee" to his bill when done in-office? Any Medicare source for this? Thank you in advance!