What is the purpose of modifier -50?

The purpose of modifier -50 is to indicate that a bilateral procedure was performed, meaning that a procedure was carried out on both sides of the body during the same session. This modifier is essential for accurately reflecting the services provided, ensuring proper reimbursement, and maintaining clear communication about the procedures performed. For instance, if a surgeon performs knee surgery on both the left and right knees in one operation, adding modifier -50 signals to the payer that the procedure was bilateral. This helps ensure appropriate payment under the guidelines for bilateral procedures, which often differ from unilateral procedures in terms of coding and reimbursement.

Modifiers like this are part of standard medical coding practices to enhance clarity and specificity in billing, differentiating routine procedures from those that are more complex or distinct in nature.