What type of procedure might require a modifier 50?

A modifier 50 is utilized in the HCPCS Level II coding system to indicate that a bilateral procedure was performed during the same surgical session. This means that the procedure was conducted on both sides of the body, such as on both limbs or both sides of a bilateral organ. For instance, if a surgeon performs a knee arthroscopy on both knees, the modifier 50 would be appended to indicate that the procedure was bilateral rather than being performed separately on each knee.

This coding practice is essential as it provides clearer billing and documentation for reimbursement purposes, ensuring that the healthcare provider is accurately compensated for the complexity and extent of the services rendered. Therefore, the correct answer reflects the specific use of modifier 50 for indicating procedures that are performed bilaterally.