Which symbol indicates an add-on code in the CPT manual?

The symbol that indicates an add-on code in the CPT manual is the circled plus sign. Add-on codes are used to report additional procedures or services that are performed in addition to the primary procedure and are designated to help coders know that these services should be reported separately when performed with a primary service. The circled plus sign specifically alerts coders to this unique classification, ensuring that proper billing and coding practices are followed.

Understanding the significance of add-on codes is crucial, as they often indicate procedures that are related to and performed in conjunction with the primary service. This helps in accurate billing and ensures that healthcare providers are reimbursed correctly for all services rendered.