Leukotriene modifiers (leukotriene antagonists) are medicines used to manage allergic rhinitis or allergies, as well as prevent asthma. These novel drugs work by blocking the action of leukotrienes.

Modifiers (usually 2-digits) are added to the main procedure code to signify that the procedure has been altered by a distinct factor. Modifiers are accepted by most payors. Modifiers can increase or ...