My docs have been doing this since the fall. We bill using the 76942 code for guidance. If more than one joint is done at a time you are able to bill again using the 76 modifier. Be careful with this though as there is not a bilateral indicator for this code and so while guidance on a shoulder and a knee would be billable and paid, guidance for bilateral knees would not be billable. I disagree with the rule, but it is the rule nonetheless. We have not had any difficulty with reimbursement.