Hi there! I know the basic rules of mod -57 are that you use it with an E/M when there is a decision made to perform a procedure with a 90-day global. However, we are trying to clarify if it can ONLY be used when the E/M is within 1 day of the procedure or if it can be used, for example, when an E/M is done a week prior to the procedure and they decide that the procedure has to be done. Please HELP!!! Thank you!