I Have Had 2 Laminectomys.1 Facet Dowel Fusion,an A Fusion

i have had 2 laminectomys.1 facet dowel fusion,an a fusion at L5S1 with medtronic LT tapered cage with infuse bonegraft,which failed because doctor didnt put posterior fixation screws ,per medicare an maker of device,an that he only done one level,shouldve fusef 2 levels including L4-5 ,WORKERS COMP IS CUTTING MY MEDS