Summary & Overview
CPT 44640: Closure of Intestinal Cutaneous Fistula, with Resection if Needed
CPT code 44640 denotes surgical closure of an intestinal cutaneous fistula, often including resection of damaged bowel and anastomosis to restore gastrointestinal continuity. This code captures a complex abdominal operation typically performed after conservative measures fail; it is clinically significant because fistula-related morbidity, prolonged hospitalization, and resource use can be substantial. Nationally, the procedure is primarily performed in inpatient settings and is relevant to acute care hospitals, surgical specialists in colorectal and general surgery, and payers managing high-cost surgical episodes.
Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise clinical and billing context for provider coding and payer engagement. Readers will find benchmarks and guidance on common modifier usage, typical sites of service, and clinical considerations that inform correct CPT coding for complex fistula repair. The piece also summarizes policy and coverage themes that affect preauthorization, inpatient admission criteria, and postacute care planning. Data limitations: specific payer fee schedules, coverage criteria, and associated ICD-10 diagnosis mappings are not provided here; where those elements are unavailable, the note "Data not available in the input." applies.
Billing Code Overview
CPT code 44640 describes the surgical closure of an intestinal cutaneous fistula — an abnormal tract between the intestine and the skin. The procedure may include resection of damaged bowel segments and anastomosis to restore an intact digestive tract when nonsurgical therapies have failed. The operative goal is definitive closure of the fistula and reestablishment of bowel continuity when indicated.
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Service type: Major abdominal surgical procedure (fistula repair with possible bowel resection and anastomosis)
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Typical site of service: Inpatient hospital operating room; may also be performed in an ambulatory surgical center for selected patients but is most commonly an inpatient procedure due to its complexity and postoperative care needs.
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient with a chronic enterocutaneous fistula that has persisted despite optimized wound care, nutritional support, and negative-pressure therapy is scheduled for operative closure. The patient presents with localized skin breakdown, malodorous drainage, and intermittent small-bowel obstruction symptoms. Preoperative assessment includes nutritional optimization (often with parenteral nutrition), sepsis screening, and cross-sectional imaging to map fistula anatomy.
In the operating room under general anesthesia, the surgical team performs adhesiolysis, resection of nonviable bowel segments if required, and primary anastomosis to restore bowel continuity. The fistula tract to the skin is excised and the skin and subcutaneous tissues are closed or reconstructed as indicated. Postoperative care includes infection surveillance, bowel function monitoring, pain control, wound management, and coordination with nutrition and wound care teams for gradual return to enteral feeding and monitoring for recurrent fistula or anastomotic leak.
Typical documentation elements include operative note describing fistula location and size, bowel resection and anastomosis details (if performed), closure technique, drains placed, estimated blood loss, indications (failure of nonsurgical therapy), and relevant comorbidities that may affect healing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | (Not a standard CMS modifier; reported in input) |