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

The correct representation of an add-on code in CPT coding is the plus (+) symbol. Add-on codes are supplementary codes that describe additional services or procedures that are performed in conjunction with a primary procedure. The plus symbol helps coders easily identify these codes among the standard range of CPT codes.

The use of the plus symbol is crucial for providing clarity in documentation and billing, as it indicates that this code cannot be billed independently but must always be used alongside a primary procedure code. This distinction helps ensure that accurate and complete coding is carried out, which is essential for appropriate reimbursement and compliance with coding guidelines.

The other symbols mentioned do not signify add-on codes. The null symbol typically indicates that the code is not to be used in a certain context, while bullseye and lightning bolt symbols represent other specific coding scenarios that are unrelated to add-on codes. Understanding the significance of the plus symbol helps coders navigate the complexities of CPT coding effectively.