A billing and coding specialist should add modifier -50 to a code when reporting which of the following?

Using modifier -50 is appropriate for indicating a bilateral procedure, which means that the same surgical procedure is performed on both sides of the body. This modifier helps to provide clear communication to insurers that a procedure has been conducted on both sides, which is essential for proper reimbursement. It signifies that the procedure was not performed separately on each side, but rather as a single, comprehensive procedure impacting both sides.

In the context of billing and coding, accurately using modifiers is crucial to reflect the services provided accurately, thereby ensuring compliance and preventing potential denials by payers. Modifier -50 is specifically assigned to bilateral procedures to distinguish them from unilateral procedures performed on just one side, which would not require this modifier.

The other options do not apply because modifier -50 specifically relates to bilateral procedures and does not pertain to unilateral procedures, pre-authorization requirements, or the setting of service delivery. Thus, understanding the application of modifier -50 is vital for correct coding and billing practices in the healthcare industry.