What dental insurance code should be used for mini implants?

Questions on insurance code for mini implants: If I install a narrow diameter implant [mini-implant] what insurance code should I use to bill out? If I treatment plan a narrow diameter implant to use during a transitional period to support a temporary appliance while the conventional diameter implants are osseointegrating, how should I bill this? If the narrow diameter implants are going to be there permanently and will support a definitive fixed or removable prosthesis or single crown, how should I bill this out?