When a physician creates an arteriovenous graft in a patient for dialysis (36821, $656.05 [fac.]), it has a 90-day global post-op period. But if the graft occludes within the 90 days and the patient has to have a thrombectomy (36831, $453.36 [fac.]), would you use modifier 78 (unplanned return to OR) or 79 (unrelated procedure during post-op period) on the second procedure?
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