Which of the following codes is NOT an add-on code?

Which of the following codes is NOT an add-on code?

• A. 33430
• B. 33510
• C. 33529
• D. 33860

Answer: (A)

Add-on codes report additional work beyond the main procedure and cannot stand alone. They are used only in conjunction with a base procedure and describe extra tasks performed during the same operation (for example, an additional graft or extension to the primary surgery). The codes that are add-ons are meant to supplement the primary code, which reports the main operation by itself. In this set, three codes describe the extra work that is added to the principal procedure, while one code reports the primary operation itself without needing a base procedure to accompany it. The code that reports the main operation (and is not designated as an add-on) is the one you would use as the base, with the others appended as add-ons if the surgeon performed that additional work. That base code is therefore the non-add-on code.

Add-on codes report additional work beyond the main procedure and cannot stand alone. They are used only in conjunction with a base procedure and describe extra tasks performed during the same operation (for example, an additional graft or extension to the primary surgery). The codes that are add-ons are meant to supplement the primary code, which reports the main operation by itself.

In this set, three codes describe the extra work that is added to the principal procedure, while one code reports the primary operation itself without needing a base procedure to accompany it. The code that reports the main operation (and is not designated as an add-on) is the one you would use as the base, with the others appended as add-ons if the surgeon performed that additional work. That base code is therefore the non-add-on code.