Summary & Overview
CPT 45305: Proctosigmoidoscopy with Biopsy
CPT code 45305 denotes a diagnostic proctosigmoidoscopy performed with biopsy of the distal colon, rectum, or anus. This code captures a commonly used endoscopic procedure that combines visual evaluation of the anorectal canal and sigmoid colon with tissue sampling to support diagnosis of inflammatory, infectious, neoplastic, or other mucosal disease. Nationally, the code is important for gastroenterology, colorectal surgery, and primary care referral workflows where targeted mucosal assessment and histologic confirmation guide treatment decisions.
Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of typical clinical indications and sites of service, common billing and coding considerations tied to procedural documentation, and benchmarking context where available. The publication outlines typical payment and coverage themes across major payers, highlights clinical scenarios that affect code selection, and summarizes documentation elements that commonly influence claims adjudication.
The content provides clinicians, coding professionals, and policy analysts with concise clinical context, payer coverage scope, and the types of benchmarks and policy updates to watch for when using CPT code 45305 in practice.
Billing Code Overview
CPT code 45305 describes a proctosigmoidoscopy with biopsy. In this procedure a provider uses a short, rigid proctosigmoid scope to examine the inner anus, rectum, and sigmoid colon and obtains one or more tissue biopsies from the examined area.
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Service type: Diagnostic endoscopic examination with biopsy
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Typical site of service: Ambulatory surgery center, hospital outpatient department, or physician office-based endoscopy suite
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient presents to an outpatient surgical or endoscopy suite with rectal bleeding and intermittent lower abdominal cramping. After a focused history and anoscopic screening, the gastroenterologist recommends a diagnostic proctosigmoidoscopy with tissue biopsy to evaluate hemorrhoids, inflammatory changes, or a suspected distal colonic lesion. The procedure is performed under monitored anesthesia care or local anesthesia in the endoscopy unit. A rigid proctosigmoidoscope is inserted to examine the anal canal, rectum, and sigmoid colon to the extent allowed by the instrument; visualized abnormal mucosa is sampled with one or more forceps biopsies. Specimens are submitted to pathology with proper labeling and documentation of number and site. Postprocedural recovery includes short observation, discharge instructions for potential bleeding or pain, and pathology follow-up for definitive diagnosis.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (default) | Use when no specific modifier applies and the service is billed as provided |
52 | Reduced services | Use when the procedure is partially reduced or not completed as originally intended |