Invoice

Frontal sinus, unilateral, intranasal operation on, including complete dissection of frontal recess and exposure of frontal sinus ostium (excludes simple probing, dilatation or irrigation of frontal sinus), other than a service associated with a service to which item 41698, 41703, 41705 or 41764 applies on the same side (H) (Anaes.) (Assist.)