Add-on Codes: 3 Tips
1. CPT® add-on codes describe procedures or services that are always provided “in addition to” other, related services or procedures. Add-on codes cannot stand alone as separately reportable services.
2. Add-on codes have no global period assigned. They are instead “included” in the global surgical fee for the primary procedure.
3. Add-on codes are “modifier 51 exempt,” and therefore are to be paid at full fee schedule value. Their assigned value accounts for the “additional” nature of the procedure.