CPT code 45342 covers sigmoidoscopy with ultrasound-guided fine-needle aspiration (FNA) and/or biopsy of abnormal tissue in the anus, rectum, and sigmoid colon. The code represents a combined diagnostic and interventional endoscopic service that enables direct visualization of distal colorectal anatomy and tissue sampling for cytology or histopathology. Nationally, this procedure is clinically important for diagnosing and staging distal colorectal lesions, guiding management decisions, and enabling targeted sampling in cases where noninvasive imaging is inconclusive.

This publication examines coverage and handling of CPT code 45342 across major payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context and typical sites of service, an outline of common billing modifiers and coding considerations, and a summary of payer coverage patterns and reimbursement benchmarks where available. The analysis also highlights documentation and billing elements that commonly influence claim adjudication, such as procedure details, scope guidance, and sampling technique.

Intended for policy analysts, billing professionals, and clinical leaders, the report provides practical reference material on coding rationale, service line placement, and payer coverage scope to support correct use of CPT code 45342. Data not available in the input are noted as such in relevant sections.