Are there consultation codes that can be used for new and existing patients when a review of systems and detailed history is performed but no examination due to the patient's reluctance to make a decision to continue with the visit but has taken up 30-45 minutes of the doctors time?


You would actually use your typical E/M codes (9920x or 9921x) and instead meeting the required criteria for documentation of these services, you would be using the time override rule for these codes. Time override does have some specific criteria for each code which you will want to review.  This is detailed on page 322 of your 2017 ChiroCode DeskBook.