When can Modifier 99 be used?

Modifier 99 is specifically used when two or more modifiers are necessary to fully describe the procedural service being billed. This modifier allows coders to apply multiple modifiers to a single procedure code, ensuring that all relevant aspects of the service are properly indicated. For example, if a procedure had both a bilateral component and a complication that needed to be noted, Modifier 99 would be used to signify the additional modifiers being applied.

In contrast, the other options do not accurately represent the use of Modifier 99. For instance, inpatient services (first option) don’t inherently require this modifier, as different guidelines may apply in those settings. The option regarding services performed multiple times could be addressed using modifiers that specifically indicate repeat procedures rather than needing Modifier 99. Lastly, a procedure involving anesthesia does not automatically necessitate Modifier 99; specific anesthesia modifiers would be more appropriate in that context. Therefore, the correct application of Modifier 99 distinctly rests on the requirement to utilize multiple modifiers for accurate claims processing.