Arch bar Removal CPT 20670 was performed on the maxillary and the mandible bones. That’s 2 different bones in the same operative session. Can this procedure can be reported twice. Or is this considered one procedure?

If this removal was part of interdental fixation device for a fracture you get 20670 once. If this is a true arch bar removal and the arch bars were not placed by the treating dentist you need to bill dental D7997, if the arch bars were placed by the treating dentist this is not a billable charge.