Summary & Overview
CPT 44389: Endoscopic Stomal Colonoscopy with Biopsy
CPT code 44389 covers an endoscopic inspection of the remaining colon through a surgically created stoma with biopsy of suspicious mucosal or tissue areas. The code is used when a provider advances an endoscope through an existing stoma to evaluate and sample abnormal tissue for histopathologic diagnosis. Nationally, this code matters because it captures a specialized diagnostic service performed in post-surgical patients, often guiding subsequent therapeutic decisions and pathology-driven care.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical and billing overview, common payer considerations, and benchmarks where available. The publication summarizes how the procedure is categorized, typical sites of service, and the clinical context that prompts its use. It also outlines common modifiers and related operational details relevant to claims processing. The content is aimed at clinicians, coding professionals, and revenue cycle staff seeking a clear national-level reference for CPT code 44389 without state-specific policy detail.
Billing Code Overview
CPT code 44389 describes an endoscopic examination of the remaining colon via a previously created stoma, with biopsy of one or more suspicious areas for histopathologic diagnosis. This procedure involves advancing an endoscope through an existing surgical opening (stoma) into the colon to inspect mucosa and obtain tissue samples when abnormal areas are identified.
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Service type: Endoscopic diagnostic procedure with biopsy through a stoma
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Typical site of service: Ambulatory surgery center or hospital endoscopy unit (procedures performed at a facility equipped for endoscopy and specimen submission to a pathology laboratory)
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with a longstanding end colostomy from prior colorectal cancer surveillance presents for evaluation of the remaining colon via the stoma. The gastroenterologist performs an endoscopic examination by introducing a colonoscope through the previously created stoma to inspect the mucosa of the remaining colon. During the procedure the provider identifies several erythematous and irregular-appearing areas and obtains targeted biopsies which are submitted for histopathology. The clinical workflow includes pre-procedure consent and history, stoma site preparation, sedation or monitored anesthesia care as indicated, endoscopic inspection through the stoma, targeted biopsy of suspicious lesions, specimen labeling and pathology submission, post-procedure recovery and documentation of findings and pathology requests.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting only the physician's professional interpretation of separately provided technical service (rare for endoscopy) |
52 | Reduced services | When the service is partially reduced or not completed as described by the CPT code |