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What code(s) would you suggest for the following procedure?

An adult barium enema tip connected to large bore tube was gently inserted into the rectum. The first attempt at reduction with Gastrografin/warm water demonstrated a tight complete volvulus of the redundant sigmoid colon without contrast proximal to the torsed segment. The second attempt at hydrostatic reduction was also unsuccessful. However, at third attempt at reduction, the volvulus completely reduced. Approximately 2.5 L of stool and fluid were evacuated. Contrast was subsequently identified refluxing retrograde to the level of the distal transverse colon. IMPRESSION: Successful hydrostatic reduction of sigmoid volvulus with water-soluble contrast.