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add-on therapy. Any treatment given to bolster or enhance the effectiveness of a previous one, esp. when the first treatment proved not to be fully effective.
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.