Which modifier cannot be reported with professional component only codes?

When it comes to professional component only codes, understanding the appropriate use of modifiers is essential. Modifier 26 is used to indicate the professional component of a service, such as when a physician interprets results from a diagnostic test. This modifier clarifies that the physician is not billing for the technical aspects of the service, which are typically indicated by modifier TC.

Modifier TC, on the other hand, applies to the technical component of a service, such as the equipment and technician usage necessary to perform diagnostic procedures. Since professional component only codes do not relate to any technical aspects, applying modifier TC with these codes would not be appropriate.

Therefore, both modifiers are exclusive in their application: modifier 26 is relevant to professional components while modifier TC strictly pertains to technical components. As a result, using both together in the context of professional component only codes is not permissible. Thus, stating that both modifiers cannot be reported with professional component only codes highlights the incompatibility of modifier TC with codes that do not have a technical component. Hence, the correct choice reflects that neither modifier 26 nor TC can correctly apply in the context of professional component only codes.