I work for Trauma surgeons who frequently have patients who have abdominal surgeries where the wound is left open and wound vac dressing is placed. The wound vac is changed every couple of days and therefore they enter the recent laparotomy wound for an abdominal washout. We have been coding this as 49002 with the modifier 52 because the wound is not reopened. We code a 97605 for the wound vac change. We are unsure if we are doing this correctly. Does anyone out there have experience with this? Also, once the wound needs closed, does anyone know if this portion is billable and how?