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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
CPT 45378 (Colonoscopy, flexible, proximal to splenic flexure, diagnostic) is used for most for most commercial payers. Medicare differs from most commercial payors for procedure code selections for colorectal screenings and uses a HCPCS code. The HCPCS G-code selection is based on the patient's level of risk.