Summary & Overview
CPT 47721: Biliary and Gastric Bypass (Anastomoses)
CPT code 47721 represents a complex operative procedure that creates a connection between the gallbladder and small intestine for bile drainage and a concurrent gastrojejunostomy to restore gastric outflow. The code is used for patients with obstructive conditions where both biliary and gastric pathways require re-establishment, such as advanced or inoperable pancreatic malignancy. Nationally, this procedure is clinically significant due to its role in palliation and restoration of enteric and biliary function in high-risk surgical candidates.
Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical intent and service setting for CPT code 47721, plus guidance on the types of benchmarks and policy topics typically relevant for this procedure. The publication addresses reimbursement benchmarks, billing and coding considerations, and clinical context that influence coverage and utilization. It also highlights common billing modifiers provided in the input and notes where additional diagnostic coding or taxonomy details would normally inform payer-specific claims processing. Data not available in the input is identified where applicable.
Billing Code Overview
CPT code 47721 describes a combined surgical procedure that creates an anastomosis between the gallbladder and the small intestine for biliary drainage while simultaneously creating a gastrojejunostomy to restore gastric emptying. The procedure is performed to re-establish both gastric and biliary function, typically when obstructive conditions such as inoperable pancreatic cancer prevent normal flow.
Service Type: Combined biliary and gastric bypass (surgical anastomoses)
Typical Site of Service: Inpatient hospital operating room
Clinical & Coding Specifications
Clinical Context
A typical patient is a 65-year-old with advanced, unresectable pancreatic head adenocarcinoma causing both gastric outlet obstruction and malignant biliary obstruction. The patient presents with progressive nausea, vomiting, weight loss, obstructive jaundice, pruritus, and elevated bilirubin. Imaging (CT or MRI) demonstrates a pancreatic mass compressing the distal common bile duct and duodenum. Endoscopic retrograde cholangiopancreatography (ERCP) with stent placement is attempted but is unsuccessful or not feasible due to tumor anatomy. The surgical team elects to perform a concurrent gastrojejunostomy and cholecystojejunostomy (Roux-en-Y or loop configuration) to restore gastric emptying and provide biliary drainage.
Preoperative workflow includes medical optimization, anesthesia evaluation, informed consent discussing palliative goals, and appropriate imaging review. Intraoperative steps include exploratory laparotomy or laparoscopy conversion, assessment of tumor operability, creation of an anastomosis between the gallbladder and jejunum for biliary drainage, and creation of a gastrojejunostomy to bypass the obstructed stomach outlet. Postoperative care involves monitoring for anastomotic leak, infection, bile leak, return of bowel function, and pain control, with coordination between surgical, oncology, and palliative care teams for ongoing management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (default) | Primary reporting when no special circumstance or modifier applies |