CPT code 45320 denotes rigid proctosigmoidoscopic examination and ablation of lesions in the anus, rectum, and sigmoid colon. The code captures procedures using a rigid proctosigmoid scope with direct visualization to ablate tumors, polyps, or other lesions that are difficult to manage with standard endoscopic tools. This procedure is clinically important given the need for targeted treatment of lesions in the distal colon and anorectal region that may not be amenable to flexible endoscopy or conventional endoscopic techniques. Nationally, CPT code 45320 is relevant to proceduralists in gastroenterology and colorectal surgery and affects facility and professional billing in ambulatory surgical centers and hospital operating rooms.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical procedure and typical sites of service, followed by benchmarking context and coding considerations. The publication summarizes reimbursement and utilization trends where available, highlights common billing modifiers, and provides clinical context for when rigid proctosigmoidoscopic ablation is documented. Data not available in the input is explicitly noted where applicable.