CPT code 45303 denotes a proctosigmoidoscopy with dilation of a colorectal stricture — a combined diagnostic and therapeutic endoscopic procedure performed on the distal colon and rectum. This code matters nationally because it documents a commonly used minimally invasive approach to relieve obstructive symptoms from benign or malignant strictures and supports appropriate facility and professional billing for the procedural and therapeutic components.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the procedure, typical sites of service, and the clinical context in which the code is used. The publication summarizes payer coverage patterns and billing considerations, highlights coding and documentation elements tied to procedural intent and complexity, and outlines common modifier use when provided by payers.

The piece is intended for clinicians, billing professionals, and policy analysts seeking a national overview of how CPT code 45303 is applied in practice, what to expect from major payers, and which clinical scenarios commonly prompt use of the code. Data not available in the input are noted where applicable.