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Current Procedural Terminology (CPT) The CPT coding system is a listing of codes and descriptors for reporting services and procedures performed by physicians. It is also a key component in almost all physician payment arrangements.
Confidence votes 6.7K. Add-on codes are used in the reporting of CPT (Current Procedural Terminology) procedure codes. A + (plus) symbol next to add-on codes describe a service or procedure that can be reported only in addition to a primary procedure. It may be identified in the coding book by descriptors such as each additional or list separately in addition to primary procedure. Add-on codes are NEVER reported as stand-alone codes because they are considered an integral part of another procedure.