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CPT 47399: Unlisted Procedure for Liver Interventions

Headline: CPT code 47399 covers unlisted liver procedures, used when no specific CPT code applies

Lead: CPT code 47399 is the unlisted procedure code for liver interventions and is employed to bill for surgical or interventional liver procedures that lack a dedicated CPT descriptor. Its use matters nationally because it affects claim adjudication, documentation requirements, and payer review processes for uncommon or evolving liver procedures.

Why it matters: Unlisted procedure codes like 47399 are important for capturing care that falls outside standardized code sets. They can trigger additional scrutiny by payers, require detailed operative reports and rationale for code selection, and influence payment variability across commercial insurers and Medicare.

Payers covered: The analysis addresses major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

What readers will learn: The publication summarizes how 47399 is applied in clinical and billing workflows, the documentation elements typically expected when submitting an unlisted liver procedure, and how major payers and Medicare approach review and payment. It also outlines benchmarks and policy considerations relevant to providers and billing teams. Data availability: Data not available in the input.

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Billing Code Overview

CPT code 47399 is an unlisted procedure code used to report procedures in the liver that do not have a specific CPT code. It captures a range of atypical or novel liver procedures when no precise code exists in the CPT code set.

Service type: Surgical or interventional liver procedure
Typical site of service: Hospital operating room, ambulatory surgical center, or other inpatient/outpatient procedural settings

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

CPT 47399: Unlisted Procedure for Liver Interventions

Headline: CPT code 47399 covers unlisted liver procedures, used when no specific CPT code applies

Payers covered: The analysis addresses major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

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Billing Code Overview

Service type: Surgical or interventional liver procedure
Typical site of service: Hospital operating room, ambulatory surgical center, or other inpatient/outpatient procedural settings

Clinical & Coding Specifications

Clinical Context

A 62-year-old patient with a history of chronic liver disease presents with a focal hepatic lesion identified on imaging that is atypical for common coded hepatic procedures. The interventional hepatobiliary surgeon performs a non-routine open or percutaneous operative procedure on the liver that does not have a specific CPT code, reported with 47399. Typical workflow includes pre-procedure imaging review (CT or MRI), informed consent highlighting the undefined-code nature of the operation, intraoperative ultrasound as needed, targeted resection, biopsy, ablation, or repair of hepatic tissue, and post-procedure monitoring for bleeding and liver function. The typical site of service is an inpatient operating room or an interventional radiology suite, with possible same-day or short inpatient observation depending on complexity and comorbidities. Documentation should describe the medical necessity, specific operative steps, duration, specimens obtained, and any complicating factors to support use of 47399.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work or complexity substantially exceeds typical for the reported procedure and documentation supports.

| 26 | Professional component | Use when reporting only the physician’s interpretation portion of a service, if applicable for imaging or consultative component.

| 50 | Bilateral procedure | Use when the liver procedure is performed bilaterally on paired organs or clearly bilateral anatomic portions when applicable.

| 51 | Multiple procedures | Use when 47399 is reported in addition to other distinct procedures performed during the same session.

| 52 | Reduced services | Use when the procedure was partially reduced or not completed as planned and documentation supports partial performance.

| 53 | Discontinued procedure | Use when the procedure was terminated due to extenuating circumstances documented in the record.

| 59 | Distinct procedural service | Use to indicate a separate and distinct procedure or service not normally reported together, when appropriate.

| 62 | Two surgeons | Use when two surgeons from different specialties work together as primary surgeons performing distinct portions of the operation.

| 66 | Surgical team (multiple surgeons) | Use when multiple surgeons provide significant, active roles in the procedure as a documented team approach.

| 78 | Return to operating room for related procedure during global period | Use when a related unplanned procedure is performed after the initial operation during the global period.

| 79 | Unrelated procedure or service by the same physician during the postoperative period | Use when an unrelated procedure occurs during the global period (note: 79 is not in the provided list; do not use it). |

Taxonomy Code	Specialty	Notes
207T00000X	Hepatology (Surgical)	Surgeons specializing in hepatic surgery performing complex operative liver procedures.

| 208600000X | General Surgery | General surgeons who perform open or laparoscopic liver procedures and resections.

| 207RA0000X | Interventional Radiology | Interventional radiologists performing percutaneous or image-guided liver procedures and ablations.

| 2080S0113X | Surgical Oncology | Surgical oncologists managing malignant hepatic lesions and complex resections.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C22.9`	Malignant neoplasm of liver, primary, unspecified	Primary liver cancers often require operative, ablative, or atypical procedures reported with `47399` when no specific code fits.

| C78.7 | Secondary malignant neoplasm of liver and intrahepatic bile duct | Metastatic liver lesions may require atypical resection or ablation reported with 47399.

| K76.9 | Liver disease, unspecified | Non-specific liver pathology necessitating non-routine operative intervention.

| K75.9 | Inflammatory disease of liver, unspecified | Inflammatory lesions or abscesses sometimes require drainage, debridement, or procedures without a specific CPT code.

| R18.0 | Malignant ascites | Ascites related to hepatic malignancy can lead to procedures addressing the liver surface or lesions as part of management.

| K74.60 | Unspecified cirrhosis of liver | Cirrhosis with focal complications (e.g., bleeding, lesions) may require atypical operative management coded with 47399.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`19301`	Partial hepatectomy; lobectomy or segmental resection	Commonly performed when hepatic lesion requires formal anatomic resection; may be coded instead of `47399` when applicable.

| 47120 | Hepatectomy, wedge resection of liver | Used for nonanatomic wedge resections; may be performed in similar clinical scenarios and chosen when a specific code applies.

| 47562 | Laparoscopy, surgical; cholecystectomy | May be performed before, during, or after hepatic procedures for biliary indications encountered intraoperatively.

| 48999 | Unlisted procedure, pelvis | Example of analogous unlisted coding approach for other anatomic sites; demonstrates billing concept when no specific code exists (not a direct liver code).

| 76942 | Ultrasonic guidance for needle placement | Frequently used adjunct for percutaneous liver biopsies or ablations to guide needle placement during the procedure.

CPT 47380: Open Radiofrequency Ablation of Liver Tumors

CPT-47381-OPEN-LIVER-CRYOABLATION

CPT 47381: Open Cryosurgical Ablation of Liver Tumors

CPT-47382-PERCUTANEOUS-RADIOFREQUENCY-ABLATION-LIVER-TUMOR

CPT 47382: Percutaneous Radiofrequency Ablation of Liver Tumor

CPT-47383-PERCUTANEOUS-LIVER-CRYOABLATION

CPT 47383: Percutaneous Cryoablation of Liver Tumors

CPT-47384-IRREVERSIBLE-ELECTROPORATION-LIVER-TUMOR-ABLATION-PERCUTANEOUS

CPT 47384: Irreversible Electroporation Ablation of Liver Tumor(s)

Frequently Asked Questions

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.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work or complexity substantially exceeds typical for the reported procedure and documentation supports.