Summary & Overview

CPT 78291: Peritoneal–Venous Shunt Evaluation, Patency Assessment

CPT code 78291 represents a diagnostic evaluation of a peritoneal–venous shunt to ensure it is patent and functioning correctly. This procedure is clinically important because shunt malfunction can lead to serious complications requiring prompt identification and management. Nationally, consistent coding for shunt evaluations affects utilization tracking, quality measurement, and appropriate payment for diagnostic services tied to implanted shunt systems.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines what clinicians, coders, and payers need to know about coding expectations, common service settings, and the clinical context for use of CPT code 78291.

Readers will learn benchmarks and patterns related to utilization and site-of-service considerations, relevant policy and billing updates that influence coverage and claim processing, and clinical context to clarify when this evaluation is indicated. Data not available in the input will be noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare78291CPTshunt evaluationdiagnostic imagingperitoneal-venous shuntinterventional radiologyimplantable device assessmenthospital outpatient

Billing Code Overview

CPT code 78291 describes a diagnostic evaluation of a peritoneal–venous shunt to confirm patency and proper function. The procedure involves assessing the shunt system for blockages or malfunction to determine whether cerebrospinal or peritoneal fluid is draining appropriately.

Service type: Diagnostic evaluation of implanted peritoneal–venous shunt
Typical site of service: Hospital inpatient or outpatient setting, interventional radiology suite, or specialty clinic where shunt assessment and imaging can be performed.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with a previously implanted peritoneal–venous (Denver-type) shunt placed for refractory ascites. The patient presents to an interventional radiology or general surgery clinic with symptoms suggesting shunt malfunction: recurrent abdominal distention, worsening peripheral edema, decreased drainage from the peritoneal cavity, or signs of shunt occlusion such as localized pain at the reservoir site. The clinical workflow begins with review of history and prior operative reports, targeted physical exam of the shunt tract and subcutaneous valve/reservoir, and focused review of recent imaging (ultrasound or CT) if available.

Next, the provider performs a shunt evaluation procedure under fluoroscopic guidance in an outpatient interventional suite or an operating room depending on patient complexity and anesthesia needs. The procedure commonly includes palpation and aspiration of the reservoir, evaluation of flow through the tubing with saline injection and observation of venous return, and imaging to assess patency (contrast injection under fluoroscopy). Documentation includes indication for evaluation, informed consent, procedure steps (access site, volumes injected, fluoroscopic findings), any therapeutic maneuvers (e.g., clearing occlusion, catheter manipulation), complications, and post-procedure plan. Typical sites of service are outpatient hospital-based interventional radiology suites, ambulatory surgery centers, or inpatient operating rooms when performed during hospitalization.

Coding Specifications

Modifier	Description	When to Use
`26`

Taxonomy Code	Specialty	Notes
208000000X	General Surgery	General surgeons frequently evaluate and revise implanted peritoneal–venous shunts in operative settings.
208600000X	Interventional Radiology	Interventional radiologists perform image-guided shunt assessments, injections, and radiologic interventions.
207L00000X	Vascular Surgery	Vascular surgeons manage venous components and access-related issues of peritoneal–venous shunts.
207P00000X	Thoracic Surgery	Thoracic surgeons may be involved when shunt venous catheter traverses thoracic venous structures or requires revision.
363A00000X	Hospitalist/Internal Medicine	Hospital-based physicians coordinate inpatient evaluations when shunt function impacts hospitalization.

CPT Code	Description	Relationship to This Procedure
`49422`	Revision of peritoneal shunt (e.g., catheter replacement)	Performed when evaluation documents need for catheter replacement or revision after demonstrated malfunction.
`36010`	Introduction of catheter, vein; jugular or facial (non-tunneled)	May be used if central venous access is required for venous limb management during shunt intervention.
`76937`	Ultrasound guidance for diagnostic and therapeutic procedures	Used when ultrasound guidance is employed to localize reservoir or catheter for access during the evaluation.
`72020`	Radiologic exam, spine or chest, fluoroscopic guidance (example)	Fluoroscopic imaging codes are reported for intra-procedural contrast studies to assess patency.
`76000`	Fluoroscopic guidance and monitoring (general)	Used to report the fluoroscopic monitoring component during contrast injection and evaluation of shunt flow.

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