Which modifiers indicate procedures on the right and left sides of the body?

The answer A, which indicates the use of modifiers -RT and -LT, is correct because these modifiers specifically denote procedures performed on the right and left sides of the body. In the Current Procedural Terminology (CPT) coding system, -RT stands for "right side" and -LT stands for "left side." These modifiers are essential for accurately reporting medical procedures, especially when they are performed on different sides of the body, as they help to prevent billing errors and ensure proper reimbursement.

The other options do not use the correct modifiers for this purpose. -LR and -RR, for instance, are not standard CPT modifiers and may cause confusion in coding practices. Similarly, -L and -R, though they may seem similar, are not the officially accepted modifiers in the CPT system for indicating sides. Lastly, the option stating that one modifier indicates the opposite side is misleading; both -RT and -LT are necessary and distinctly used to clarify procedures on each respective side, without any ambiguity about one representing the opposite side.