All of these codes are NOT approach specific. I did the KZA webinar about the new codes and Kim Pollock explained them. The codes actually say "with integral anterior instrumentation for device anchoring, when performed" which only mean that if you are using the combo interbody/plate(i.e. Prevail Cage) then you would only use this code and not separately bill the plate. You are not required to use anterior anchoring for this code, only when performed. This is how I am going to use these codes.
22853-for ACDF, PLIF, PLIF/PLF Fusions
22854-Corpectomies
22859-This was explained to me for use for Spinal Reconstruction for stabilization or when there is a reconstruction after a tumor removal.
Hope this helps!