Which of the following denotes an add-on code in CPT?

In Current Procedural Terminology (CPT) coding, an add-on code is specifically marked with a plus sign in front of it. This function identifies it as a code that cannot be reported by itself, but rather is intended to be used in conjunction with a primary procedure code to provide additional detail about the service performed. For instance, add-on codes may describe procedures that are typically performed at the same time as another procedure, clarifying the scope of the services rendered.

The presence of the plus sign is essential, as it signals that this is an additional service beyond the primary procedure, usually denoting that it requires a separate reporting but is not sufficient on its own to reflect the entire service performed. This is standardized across the coding conventions, ensuring that those reporting and analyzing healthcare procedures can accurately account for all services in terms of billing and documentation.

Other indicators, such as an asterisk or notes that follow a code, do not specifically denote an add-on code. The asterisk can signal a special circumstance related to that code, and descriptive notes provide additional clarification but lack the definitive marker of an add-on. Sequencing of codes does not inherently define an add-on code, either, as it can involve various types of codes depending on the