In CPT coding, what does it mean if a code is described as "add-on"?

The designation of a code as "add-on" in CPT coding indicates that it is intended to be used in conjunction with a primary procedure or service. Add-on codes represent additional work or services that enhance the primary service performed. They cannot be reported on their own; instead, these codes must accompany a specific primary code to accurately reflect the full scope of services rendered during a medical procedure.

This categorization is essential because it allows healthcare providers to bill for comprehensive care that includes both the main procedure and any supplementary tasks necessary for optimal patient management. Properly using add-on codes ensures accurate reimbursement and compliance with coding guidelines, allowing for a complete picture of the patient's treatment.

Other options do not align with the definition of add-on codes. The independent use of a code would pertain to stand-alone codes, not add-ons. States regarding billability or performance sequence do not capture the inherent nature of what defines an add-on code in the context of procedural coding.