If you need to modify a service code for a past appointment, you can do so right from your calendar!
First, click on the calendar appointment to open the flyout for that session.
If you have already created a Superbill that contains this session, you will first need to delete the Superbill in order change the service code.
Just click on the Superbill link beneath the words "Service Code" to open the bill and delete it by clicking the "Delete" button in the top right corner of the screen.
Once the Superbill is deleted, the Service Code area will become unlocked. Click the "edit" button to the right of the session fee.
Now you can:
-Select the new code you want from this dropdown menu
-Set the fee for this code (if you want to change it from your default fee)
Make your changes and cilck "Done" to save the appointment!