Mrs. marsden slipped on the ice last winter and fractured several lumbar vertebrae. since then she has required pain management therapy at her local hospital with an anesthesiologist. he performs a therapeutic injection of 5% marcaine mixed with the steroid decadron (16mg) into the nerve located in the facet joints at levels l3-l4 and l4-l5 on both sides at each level. what cpt® code(s) are reported for this procedure?