Ah, nerve blocks - that's a whole separate conversation actually - coding for a nerve block is not the same thing as charging for anesthesia, because the nerve block is coded as an additional procedure, and not just as a charge for the anesthesia costs. Facility fees for nerve blocks has been a rather complicated and controversial topic in the facilities where I've coded, and I'm not sure I can give you a definitive answer on this.
Under NCCI rules (see Chapter 2 of the NCCI Policy Manual) a nerve block can be reported separately by anesthesia 'when the surgeon requests assistance with postoperative pain management', and when the mode of anesthesia is general, but is not separately reportable if the mode of anesthesia itself is the nerve block. In other words, since the nerve block code will bundle with almost any surgical procedure, in order to unbundle it with a modifier 59 or XP or XU, it must meet the criteria laid out in the NCCI guidelines. This guidance is a bit confusing from a facility perspective, and I think some facilities have elected not to bill the nerve block codes because the physician documentation often does not adequately reflect that this is a separately identifiable procedure from the surgery and the anesthesia itself.
However, my experience on the hospital side has been that under the current OPPS reimbursement, even when the nerve block is reported, it does not change the reimbursement because the nerve blocks are considered a packaged service and it does not result in a separate line-item payment. My advice would be that if you are going to consider coding for nerve blocks and using the unbundling modifiers, which could potentially result in additional payment for some payers and in some situations, you look over that section of the NCCI manual carefully and make sure that the documentation justifies this.