What symbol denotes an add-on code in CPT coding?

In CPT coding, an add-on code is denoted by the plus symbol. This symbol indicates that the procedure represented by the add-on code is performed in addition to a primary procedure and cannot be reported independently. Add-on codes typically describe services that are commonly provided in conjunction with another procedure, ensuring that billing accurately reflects the comprehensive nature of the medical services rendered.

Add-on codes help to clarify the code structure in the CPT system, guiding medical professionals in reporting procedures that enhance or complement the primary service without having them submitted as stand-alone services. This understanding is essential for proper medical billing and auditing, as it ensures that the codes reported align with the services provided and that reimbursement reflects the full scope of care delivered. By using the plus symbol, the coding system effectively communicates the need to always reference the related primary code when applying the add-on.