Summary & Overview
CPT 45342: Sigmoidoscopy with Ultrasound-Guided FNA/Biopsy
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.
Billing Code Overview
CPT code 45342 describes a diagnostic and interventional sigmoidoscopic procedure in which a provider examines the inner anus, rectum, and sigmoid colon using a flexible sigmoidoscope and performs ultrasound-guided fine-needle aspiration and/or biopsy of abnormal tissue through the scope's working channel.
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Service type: Sigmoidoscopy with ultrasound-guided fine-needle aspiration and/or biopsy (diagnostic and interventional endoscopic procedure)
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Typical site of service: Ambulatory surgery center or hospital outpatient department; may also be performed in endoscopy suites equipped for sigmoidoscopy and interventional sampling
Clinical & Coding Specifications
Clinical Context
A 58-year-old male presents to colorectal surgery with a three-week history of rectal bleeding, intermittent tenesmus, and a palpable posterior rectal mass on digital rectal exam. Prior office anoscopy suggested an abnormal lesion in the rectosigmoid region. The patient is scheduled for a flexible sigmoidoscopy with endoscopic ultrasound-guided fine needle aspiration/biopsy to obtain tissue for histopathology and to stage a suspected rectal neoplasm.
The clinical workflow includes pre-procedure consent and history, sedation per facility policy (conscious sedation or monitored anesthesia care), bowel preparation as indicated, performance of flexible sigmoidoscopy with endoscopic ultrasound visualization of the rectum and sigmoid, and placement of a fine needle through the sigmoidoscope channel to aspirate or biopsy the suspicious lesion under ultrasound guidance. Specimens are sent to pathology with appropriate labeling and documentation of number of passes and adequacy. Recovery and post-procedure instructions are provided, including pathology follow-up and oncology referral if malignancy is confirmed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting only the physician’s interpretation/read (if technical component billed separately by facility). |