Building a Better Understanding of Biliary Tract Coding in 2025

As the healthcare landscape continues to experience a sharp and ongoing decline in reimbursement, accurate coding has never been more critical. Coding dollars are under serious threat, with an estimated $125 billion lost annually nationwide due to poor billing and coding practices. Even more alarming, nearly 50% of the claims denied may never be resubmitted, leaving significant revenue permanently on the table. Against this backdrop, biliary tract procedures present unique coding challenges. These procedures—often necessary to treat obstructed bile ducts caused by tumors, scarring, inflammation, or gallstones—range from open surgical interventions to minimally invasive percutaneous approaches. Adding to the procedural complexity, recent Medicare revisions have altered global periods for many of these services, further complicating coding and reimbursement. In this climate of shrinking margins and rising audit risk, this month’s focus on biliary tract coding delivers essential guidance to ensure accuracy, compliance, and maximum reimbursement in an increasingly unforgiving environment.

Breaking Barriers in Biliary Tract Basics

To better understand the full scope of biliary interventions, it’s important to start with the basics. Bile is a digestive fluid produced by the liver that travels through a network of bile ducts into the gallbladder, where it is stored. During digestion—especially after eating—bile is released from the gallbladder and flows through the ducts into the duodenum, where it aids in breaking down fats into fatty acids. However, when a bile duct becomes obstructed, bile can’t reach the duodenum, leading to a buildup that may cause symptoms such as jaundice, abdominal pain, fever, nausea, and vomiting. Common causes of these blockages include tumors, scarring, inflammation, and gallstones.

Open surgical procedures are available for evaluating and treating bile-duct blockages. However, minimally invasive percutaneous procedures performed by interventional radiologists are increasingly common. Medicare has updated the global periods for most of these procedures from 90 days to 0 days. Diagnostic exams, imaging, and supervision and interpretation are now included in most therapeutic procedures when performed in the same session.

Coding Analysis

A patient with cholecystitis (inflammation of the gallbladder) may need to have a drainage catheter placed. When a physician places the drainage tube through the abdominal wall into the gallbladder, code 47490—a complete code—is assigned.  Note that this code continues to have a 10-day global period.

Note there are some significant nuances in this area. Injection of contrast to evaluate a previously placed cholecystostomy tube should be reported with cholangiogram through existing access code 47531. Cholecystostomy check and change would be reported with code 47536—exchange of biliary drainage catheter. Understand that this code would be inclusive of contrast injection through the existing catheter.

However, no additional imaging or guidance codes should be assigned. Imaging of the bile ducts after injecting contrast is known as a cholangiogram. Depending on the specific circumstances, several codes are available for use.

When a radiologist interprets images from a cholangiogram being performed in surgery, he would code 74300-26-52 for the initial set of images. If a subsequent set of images is returned for interpretation, assign code 74301-26-52. Modifier 26 is added to these codes to indicate that only the professional component is being billed. Modifier 52 indicates that a lesser service is performed, in this case interpretation only, not supervision.

It is important to note that the two codes above for stand-alone percutaneous diagnostic cholangiography replace codes 47500, 47505, 74320, and 74305. Both codes are complete codes, and account for the injection of contrast, imaging, and supervision and interpretation.

Code 47531 is reported when a diagnostic cholangiogram is performed through an existing access such as a T-tube or external biliary drainage catheter.

⚠ Your 2025 IR Coding Remains Under Threat Creating Significant Risk to Your Bottom Line. These Are NOT All the Tips and Tricks Necessary for Success. 

With every dollar of reimbursement counting more than ever in the face of payment decline and complex changes, it’s imperative to make sure your CPT^® coding is correct and compliant. Master more coding topics and break down the complexity with 2025 GI/Biliary Interventional Radiology Coding webcast on June 11, 2025 at 11:00 am CT.