Summary & Overview
CPT 47420: Common Bile Duct Exploration and Drainage
CPT code 47420 represents surgical exploration and incision of the common bile duct, a procedure used to examine the duct, remove obstructing stones, or place a drainage tube to restore biliary flow. Nationally, this code is relevant for hospitals and surgical centers managing biliary obstruction, choledocholithiasis, and related complications that require operative intervention. Payers commonly covering services associated with this code include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication provides a concise overview of clinical context and billing considerations for CPT code 47420. Readers will find benchmarks and typical reimbursement context where available, a summary of payer coverage patterns, and notes on clinical indications and procedural settings. The content highlights how the procedure is performed, typical sites of service, and the operational implications for surgical teams and revenue cycle departments. Data not available in the input is explicitly noted where applicable. The goal is to give clinicians, coding professionals, and payers a clear national-level briefing on the code’s clinical purpose and administrative considerations without state-specific references.
Billing Code Overview
CPT code 47420 describes a surgical procedure in which the provider identifies and incises the common bile duct. The procedure may include examination of the duct, removal of biliary stones, or placement of a drainage tube to promote bile flow and relieve obstruction.
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Service type: Operative biliary procedure involving exploration and intervention on the common bile duct
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Typical site of service: Operating room or surgical suite in a hospital or ambulatory surgical center where open or minimally invasive biliary surgery is performed
Clinical & Coding Specifications
Clinical Context
A typical patient is a 55-year-old presenting with right upper quadrant pain, jaundice, and elevated liver function tests consistent with obstructive cholestasis. Imaging (abdominal ultrasound or CT) demonstrates dilated intrahepatic bile ducts and a suspected common bile duct (CBD) stone. The patient is scheduled for operative management in an operating room under general anesthesia. The surgical team performs an open or laparoscopic exploration of the common bile duct: the duct is identified and incised, a stone is extracted (with or without choledochoscopy), and a T-tube or stent may be placed for drainage. Intraoperative cholangiography may be performed to confirm clearance. Typical perioperative workflow includes preoperative assessment and consent, anesthesia induction, surgical exploration and choledochotomy, stone removal or tube placement, hemostasis and closure, and postoperative monitoring on a surgical ward. This procedure is frequently performed by general surgeons or hepatobiliary surgeons for biliary obstruction due to choledocholithiasis, retained stones after cholecystectomy, or suspected biliary injury requiring exploration and drainage.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the service requires substantially greater work than typical, documented with justification. |
52 | Reduced services | Use when the full procedure is not completed as described due to clinical reasons. |
53 | Discontinued procedure | Use when the procedure is started but halted for patient-related or safety reasons. |
62 | Two surgeons | Use when two surgeons work together as primary surgeons throughout the procedure. |
66 | Surgical team | Use when a surgical team performs portions of the procedure. |
78 | Return to OR for related procedure during global period | Use when a return to the operating room is required for a complication related to the original procedure. |
80 | Assistant surgeon | Use when an assistant surgeon provides technical assistance and is separately reportable. |
81 | Minimum assistant surgeon | Use when minimal assistance is provided by a second surgeon. |
50 | Bilateral procedure | Not typically applicable but listed when bilateral anatomic treatment would be reported (rare for CBD). |
51 | Multiple procedures | Use when additional distinct procedures are performed during the same operative session. |
26 | Professional component | Use if reporting only the surgeons professional component separate from technical facility billing (rare for this CPT). |
73 | Discontinued outpatient hospital/ambulatory surgery center before anesthesia | Use if procedure aborted prior to anesthesia in applicable settings. |
59 | Distinct procedural service | Not in original list; omitted per instructions. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207L00000X | General Surgery | Most common specialty performing choledochotomy and CBD exploration. |
207LU0402X | Hepatobiliary Surgery | Subspecialty focusing on complex biliary procedures. |
2080P0208X | Surgical Oncology | Performs biliary surgery when malignancy is suspected or present. |
207K00000X | Thoracic Surgery | Occasionally performs biliary procedures in complex multidisciplinary cases. |
363LE0000X | Gastroenterology | Performs endoscopic alternatives (ERCP) but not typically open CBD exploration; included for care coordination. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
K80.1 | Calculus of bile duct with cholangitis | Common indication when CBD stones cause infection—necessitates drainage and stone removal. |
K80.3 | Calculus of bile duct with cholecystitis | CBD stones associated with gallbladder inflammation; may prompt combined cholecystectomy and CBD exploration. |
K80.4 | Calculus of bile duct without cholecystitis or cholangitis | Symptomatic choledocholithiasis causing obstruction managed by choledochotomy and stone extraction. |
K83.1 | Obstruction of bile duct | Noncalculous obstruction (stricture or external compression) requiring exploration and possible drainage. |
K83.0 | Cholangitis | Biliary infection that may necessitate urgent decompression via incision and drainage of the CBD. |
T81.31XA | Disruption of bile duct, initial encounter | Used when iatrogenic bile duct injury is diagnosed and requires exploration and repair. |
R17 | Unspecified jaundice | Clinical finding prompting biliary evaluation and potential surgical exploration. |
K91.83 | Postcholecystectomy syndrome | When retained stones or biliary dysfunction after cholecystectomy require operative management. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
47562 | Laparoscopy, surgical; cholecystectomy | Performed before or concurrently when cholelithiasis with symptomatic gallbladder disease is present; CBD exploration may follow if stones migrate. |
47563 | Laparoscopy, surgical; cholecystectomy with cholangiography | Intraoperative cholangiogram performed to identify biliary stones or anatomy prior to choledochotomy. |
43264 | Endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy and/or stone removal | A less invasive alternative for CBD stone extraction; may be performed pre- or post-operatively. |
76942 | Ultrasonic guidance for needle localization | May be used intraoperatively for guided drainage or localization of biliary structures. |
49440 | Insertion of tunneled intraperitoneal drainage catheter | Used when additional biliary or peritoneal drainage is required postoperatively. |
74328 | Percutaneous transhepatic cholangiography (diagnostic) | Diagnostic imaging alternative to evaluate biliary obstruction when ERCP is not feasible. |