Which modifier indicates that a procedure was performed on the opposite site?

Modifier 50 is specifically used to indicate that a bilateral procedure was performed, which means that a procedure has been carried out on both sides of the body. However, in certain contexts, this modifier can imply that the same procedure is done on the opposite side when it is not typically bilateral.

In instances where a procedure is typically interpreted as being unilateral but is performed on both sides, modifier 50 is applied to denote that this is a deliberate action rather than a coding error or misunderstanding. This is particularly relevant in surgical contexts where distinguishing between bilateral and unilateral procedures affects billing and insurance coverage.

Other modifiers in the list serve different purposes: Modifier 53 indicates a discontinued procedure, modifier 76 is for repeat procedures by the same physician on the same day, and modifier 59 is used to denote a distinct procedural service when more than one procedure is performed. Each modifier plays a specific role in coding and ensures proper communication of the circumstances surrounding the procedure, but in this case, only modifier 50 accurately reflects procedures performed on the opposite side.