Which modifier is NOT applicable to procedures that are bilateral by definition?

The choice of modifier that is not applicable to procedures that are bilateral by definition is correct. Modifier 50 specifically indicates that a procedure was performed bilaterally on both sides of the body. This modifier is crucial for procedures that are inherently bilateral, ensuring proper coding and reimbursement for such instances.

In contrast, modifiers like 32, 47, and 51 serve different purposes. Modifier 32 is used to indicate a mandated service, often required by a third party for specific circumstances, but it does not pertain specifically to bilateral procedures. Modifier 47 is used to denote a professional component for anesthesia services when administering anesthesia during a procedure, rather than solely indicating bilateral status. Modifier 51 indicates that multiple procedures were performed during the same session but does not relate to whether those procedures are bilateral by definition.

Thus, modifier 50 is the only modifier that explicitly applies to procedures performed on both sides that are inherently bilateral, and therefore, is not applicable to procedures that don’t fall under this category.