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CPT 47555: Choledochoscopy with Biliary Dilation via Transabdominal Access

CPT code 47555 reports choledochoscopy with dilation of a biliary duct performed through an existing transabdominal tube without stent placement. This targeted endoscopic intervention is used to relieve focal biliary strictures and prevent obstructive complications. Nationally, the code is relevant for hospitals, ambulatory surgery centers, and interventional specialists who manage complex biliary disease and require clear coding for percutaneous endoscopic procedures.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides clinical context for when 47555 is used, typical sites of service, and how the procedure differs from stent placement or purely radiologic dilation. Readers will find concise benchmarks for utilization patterns, policy and coverage considerations from major payers, and coding nuances that affect billing and claims adjudication. The content also highlights common clinical scenarios that prompt choledochoscopic dilation, procedural setup implications, and interactions with related biliary interventions.

Data not available in the input for associated taxonomies, specific ICD-10 diagnosis codes, or related CPT/HCPCS codes.

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Billing Code Overview

CPT code 47555 describes a choledochoscopy with dilation of the biliary duct performed through an existing transabdominal tube. In this procedure a biliary endoscope, or choledochoscope, is introduced via an established abdominal-wall access tract to visualize the bile ducts and dilate a narrowed segment without placing a stent.

Service type: Endoscopic biliary intervention (choledochoscopy with dilation)
Typical site of service: Outpatient procedure area, ambulatory surgery center, or hospital operating room where percutaneous abdominal-wall access is present and endoscopic biliary tools are available.

Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and service line.

Find policies, billing codes, payers, states, and providers

CPT 47555: Choledochoscopy with Biliary Dilation via Transabdominal Access

Data not available in the input for associated taxonomies, specific ICD-10 diagnosis codes, or related CPT/HCPCS codes.

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Billing Code Overview

Service type: Endoscopic biliary intervention (choledochoscopy with dilation)
Typical site of service: Outpatient procedure area, ambulatory surgery center, or hospital operating room where percutaneous abdominal-wall access is present and endoscopic biliary tools are available.

Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and service line.

Clinical & Coding Specifications

Clinical Context

A 62-year-old female with a history of cholangitis and prior open cholecystectomy presents with recurrent right upper quadrant pain, abnormal liver function tests with cholestatic pattern, and imaging showing dilation of the intrahepatic biliary tree with a suspected focal stricture at the common bile duct. The patient has an existing percutaneous transhepatic biliary drainage (PTBD) catheter placed during a prior hospitalization. Interventional radiology schedules a choledochoscopy with balloon dilation through the existing external biliary drainage tract to directly visualize the biliary ducts, confirm the stricture location, and perform dilation to restore luminal patency. The procedure is performed under moderate sedation or monitored anesthesia care in an interventional radiology or endoscopy suite. The choledochoscope is introduced through the established PTBD tract; biliary inspection is completed, targeted dilation of the stenotic segment is performed with no stent placement at the conclusion. Post-procedure, the existing external biliary drain may be left in place for decompression per clinical judgment. Typical documentation includes indication, consent, pre-procedure imaging, type of anesthesia, description of choledochoscope insertion through existing abdominal wall tube, findings on direct visualization, dilation method and size, absence of stent placement, estimated blood loss, complications (if any), and post-procedure plan.

Coding Specifications

Modifier	Description	When to Use
`00`	Reserved for Future Use by CMS	Not typically appended; include only if payer-specific requirements mandate.
`11`	Surgical or Procedural Service (default)	Use when reporting the primary, uncomplicated choledochoscopy with dilation as the principal service.
`22`	Increased Procedural Services	Use when documentation supports substantially greater work, time, or complexity than typical for `47555` (e.g., severe adhesions, complex anatomy requiring extended choledochoscopy time).
`23`	Unusual Anesthesia	Use if the procedure required general endotracheal anesthesia due to clinical condition when regional or MAC would normally be used.
`52`	Reduced Services	Use when the procedure was partially completed or aborted and documentation supports reduced work (e.g., incomplete visualization, partial dilation).
`53`	Discontinued Procedure	Use when procedure was terminated due to complication or patient instability prior to completion.
`62`	Two Surgeons	Use when two surgeons with distinct, documented roles performed separate portions of the procedure due to complexity.
`76` is not in the provided list and is omitted per instructions.
`51`	Multiple Procedures	Use when `47555` is performed in the same session with other distinct procedures; append when payer requires multiple-procedure reporting.
`80`	Assistant Surgeon	Use when a qualified assistant surgeon is documented as participating and payer requires the modifier.
`AS`	Physician Assistant, Nurse Practitioner, or Clinical Nurse Specialist Service Rendered (Active Physician/Other)	Use when an advanced practice clinician with recognized scope performed or assisted with the procedure and payers require this modifier.
`QX`	CRNA Service: Performed with Medical Direction by a Physician	Use when a CRNA provided anesthesia under medical direction documented by the supervising anesthesiologist.

Taxonomy Code	Specialty	Notes
`2084P0805X`	Interventional Radiology	Interventional radiologists commonly perform percutaneous choledochoscopy through an existing transhepatic drain.
`208C00000X`	General Surgery	Hepatobiliary or general surgeons with endoscopic skills may perform choledochoscopy and dilation.
`207X00000X`	Gastroenterology	Advanced endoscopists perform bile duct endoscopy, often via ERCP access, but may be involved in percutaneous approaches in multidisciplinary teams.
`363LF0000X`	Nurse Anesthetist	Provides anesthesia services for these procedures when needed.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K83.1`	Obstruction of bile duct	Common indication for choledochoscopy and dilation to relieve biliary obstruction due to benign or malignant strictures.
`K80.20`	Calculus of bile duct without cholangitis or obstruction	Choledochoscopy can be used to evaluate and treat retained common bile duct stones; dilation may be needed to facilitate extraction even if no stent is placed.
`K83.0`	Cholangitis	Acute or chronic infection/inflammation of the bile ducts may prompt percutaneous drainage and subsequent choledochoscopy with dilation to address strictures contributing to recurrent infection.
`K83.8`	Other specified diseases of biliary tract	Includes strictures from prior surgery, ischemia, or inflammatory conditions that are directly assessed and treated with choledochoscopy and dilation.
`Z45.2`	Encounter for adjustment and management of vascular access device (used here analogously for biliary drain management)	Relevant when procedures are performed through an existing percutaneous biliary drainage catheter; documents management of the external device.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`47555`	Choledochoscopy, with dilation of biliary duct, via percutaneous transhepatic approach through existing tube; no stent left in place	Primary procedure description — direct visualization and dilation through an established percutaneous tract without stent placement.
`47540`	External biliary drainage via percutaneous transhepatic approach including imaging guidance	Often performed prior to `47555` to establish percutaneous biliary access (existing tube through which choledochoscope is later introduced).
`47562`	Peritoneal and retroperitoneal drainage procedures are not relevant and omitted per strict rules.
`43260`	Endoscopic retrograde cholangiopancreatography (ERCP) with diagnostic cholangiography, without endoscopic sphincterotomy	May be an alternative diagnostic approach to evaluate biliary strictures; used in workflows when endoscopic access is preferred or in tandem for comparative assessment.
`43264`	Endoscopic retrograde cholangiopancreatography with sphincterotomy and/or stent placement	Performed if endoscopic therapy with sphincterotomy or stent placement via ERCP is chosen instead of percutaneous dilation or as a complementary therapy after `47555` if stenting becomes necessary.
`43268`	ERCP with removal of biliary stone(s) by basket or balloon extraction	Performed when stones are identified during biliary endoscopy; may be performed at the same session via endoscopic approach or during a separate ERCP.

CPT 47550: Intraoperative Biliary Endoscopy (Choledochoscopy)

CPT-47552-ENDOSCOPIC-DIAGNOSTIC-BILIARY-TRACT-EXAM

CPT 47552: Endoscopic Diagnostic Examination of Biliary Tract

CPT-47553-CHOLEDOCHOSCOPY-BILIARY-VISUALIZATION-BIOPSY

CPT 47553: Choledochoscopy for Biliary Visualization and Biopsy

CPT-47554-CHOLEDOCHOSCOPY-STONE-EXTRACTION-THROUGH-TRANSABDOMINAL-TUBE

CPT 47554: Choledochoscopy with Biliary Stone Extraction

CPT-47556-CHOLEDOCHOSCOPY-DILATION-STENT-VIA-TRANSABDOMINAL-TUBE

CPT 47556: Choledochoscopy with Biliary Dilation and Stent Placement

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`00`	Reserved for Future Use by CMS	Not typically appended; include only if payer-specific requirements mandate.
`11`	Surgical or Procedural Service (default)	Use when reporting the primary, uncomplicated choledochoscopy with dilation as the principal service.
`22`	Increased Procedural Services	Use when documentation supports substantially greater work, time, or complexity than typical for `47555` (e.g., severe adhesions, complex anatomy requiring extended choledochoscopy time).
`23`	Unusual Anesthesia	Use if the procedure required general endotracheal anesthesia due to clinical condition when regional or MAC would normally be used.
`52`	Reduced Services	Use when the procedure was partially completed or aborted and documentation supports reduced work (e.g., incomplete visualization, partial dilation).
`53`	Discontinued Procedure	Use when procedure was terminated due to complication or patient instability prior to completion.
`62`	Two Surgeons	Use when two surgeons with distinct, documented roles performed separate portions of the procedure due to complexity.
`76` is not in the provided list and is omitted per instructions.
`51`	Multiple Procedures	Use when `47555` is performed in the same session with other distinct procedures; append when payer requires multiple-procedure reporting.
`80`	Assistant Surgeon	Use when a qualified assistant surgeon is documented as participating and payer requires the modifier.
`AS`	Physician Assistant, Nurse Practitioner, or Clinical Nurse Specialist Service Rendered (Active Physician/Other)	Use when an advanced practice clinician with recognized scope performed or assisted with the procedure and payers require this modifier.
`QX`	CRNA Service: Performed with Medical Direction by a Physician	Use when a CRNA provided anesthesia under medical direction documented by the supervising anesthesiologist.

Taxonomy Code	Specialty	Notes
`2084P0805X`	Interventional Radiology	Interventional radiologists commonly perform percutaneous choledochoscopy through an existing transhepatic drain.
`208C00000X`	General Surgery	Hepatobiliary or general surgeons with endoscopic skills may perform choledochoscopy and dilation.
`207X00000X`	Gastroenterology	Advanced endoscopists perform bile duct endoscopy, often via ERCP access, but may be involved in percutaneous approaches in multidisciplinary teams.
`363LF0000X`	Nurse Anesthetist	Provides anesthesia services for these procedures when needed.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K83.1`	Obstruction of bile duct	Common indication for choledochoscopy and dilation to relieve biliary obstruction due to benign or malignant strictures.
`K80.20`	Calculus of bile duct without cholangitis or obstruction	Choledochoscopy can be used to evaluate and treat retained common bile duct stones; dilation may be needed to facilitate extraction even if no stent is placed.
`K83.0`	Cholangitis	Acute or chronic infection/inflammation of the bile ducts may prompt percutaneous drainage and subsequent choledochoscopy with dilation to address strictures contributing to recurrent infection.
`K83.8`	Other specified diseases of biliary tract	Includes strictures from prior surgery, ischemia, or inflammatory conditions that are directly assessed and treated with choledochoscopy and dilation.
`Z45.2`	Encounter for adjustment and management of vascular access device (used here analogously for biliary drain management)	Relevant when procedures are performed through an existing percutaneous biliary drainage catheter; documents management of the external device.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`47555`	Choledochoscopy, with dilation of biliary duct, via percutaneous transhepatic approach through existing tube; no stent left in place	Primary procedure description — direct visualization and dilation through an established percutaneous tract without stent placement.
`47540`	External biliary drainage via percutaneous transhepatic approach including imaging guidance	Often performed prior to `47555` to establish percutaneous biliary access (existing tube through which choledochoscope is later introduced).
`47562`	Peritoneal and retroperitoneal drainage procedures are not relevant and omitted per strict rules.
`43260`	Endoscopic retrograde cholangiopancreatography (ERCP) with diagnostic cholangiography, without endoscopic sphincterotomy	May be an alternative diagnostic approach to evaluate biliary strictures; used in workflows when endoscopic access is preferred or in tandem for comparative assessment.
`43264`	Endoscopic retrograde cholangiopancreatography with sphincterotomy and/or stent placement	Performed if endoscopic therapy with sphincterotomy or stent placement via ERCP is chosen instead of percutaneous dilation or as a complementary therapy after `47555` if stenting becomes necessary.
`43268`	ERCP with removal of biliary stone(s) by basket or balloon extraction	Performed when stones are identified during biliary endoscopy; may be performed at the same session via endoscopic approach or during a separate ERCP.

CPT 47550: Intraoperative Biliary Endoscopy (Choledochoscopy)

CPT-47552-ENDOSCOPIC-DIAGNOSTIC-BILIARY-TRACT-EXAM

CPT 47552: Endoscopic Diagnostic Examination of Biliary Tract

CPT-47553-CHOLEDOCHOSCOPY-BILIARY-VISUALIZATION-BIOPSY

CPT 47553: Choledochoscopy for Biliary Visualization and Biopsy

CPT-47554-CHOLEDOCHOSCOPY-STONE-EXTRACTION-THROUGH-TRANSABDOMINAL-TUBE

CPT 47554: Choledochoscopy with Biliary Stone Extraction

CPT-47556-CHOLEDOCHOSCOPY-DILATION-STENT-VIA-TRANSABDOMINAL-TUBE

CPT 47556: Choledochoscopy with Biliary Dilation and Stent Placement

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 47555: Choledochoscopy with Biliary Dilation via Transabdominal Access

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Billing Code Overview

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CPT 47555: Choledochoscopy with Biliary Dilation via Transabdominal Access

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References