What is the function of an add-on code?

An add-on code is specifically designed to identify services or procedures that are supplementary to a primary procedure and cannot be reported independently. This means that an add-on code provides additional information about a procedure that is performed in conjunction with a primary service. The primary service has its own code, and the add-on code is used to indicate that an additional related service has been performed, which cannot stand alone without the primary code.

Using an add-on code allows for a more comprehensive representation of the services rendered during a patient encounter. This coding structure helps ensure that healthcare providers are appropriately reimbursed for multiple services provided during a single session, while also maintaining clarity in the coding process. Therefore, understanding that an add-on code cannot be used on its own and relies on another code for full context is critical for accurate coding and billing practices.