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CPT 49424: Catheter Contrast Injection for Abscess or Cyst Evaluation

CPT code 49424 denotes image-guided injection of contrast material through an existing drainage catheter to better visualize and assess an abscess or cyst. The code captures a focused diagnostic procedure that clarifies catheter position and the anatomy of fluid collections, supporting clinical decision-making about ongoing drainage, further intervention, or surgical planning. Nationally, this code matters because it is tied to interventional radiology workflows, impacts facility and professional billing for image-guided procedures, and aligns with broader imaging and infection-management pathways.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for the service, typical sites of service, and the common billing modifiers associated with this procedure. The publication also outlines benchmarks and policy-relevant considerations affecting coverage and billing for image-guided catheter studies, describes where this service fits within interventional radiology and surgical care, and highlights documentation elements commonly relevant for claims. Data not available in the input includes specific payer coverage policies, reimbursement benchmarks by payer, and associated ICD-10 diagnoses.

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Billing Code Overview

CPT code 49424 describes injection of contrast material through an existing drainage catheter to visualize and assess the size, type, and location of an abscess or cyst being drained. This procedure is a targeted radiologic intervention used to evaluate catheter position and the anatomy of the fluid collection.

Service type: Image-guided catheter contrast injection for diagnostic evaluation
Typical site of service: Radiology suite, interventional radiology, or other procedural areas where image-guided drainage catheters are managed

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CPT 49424: Catheter Contrast Injection for Abscess or Cyst Evaluation

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Billing Code Overview

Service type: Image-guided catheter contrast injection for diagnostic evaluation
Typical site of service: Radiology suite, interventional radiology, or other procedural areas where image-guided drainage catheters are managed

Clinical & Coding Specifications

Clinical Context

A typical patient is a 54-year-old male with a previously placed percutaneous abscess drainage catheter for a complex intra-abdominal abscess following diverticulitis. The drain has been in place for several days and drainage has decreased; the surgical team requests contrast injection through the existing catheter to define the cavity size, assess for residual loculations or fistulous communication, and confirm catheter position before deciding on catheter removal or exchange. The procedure is performed in an interventional radiology suite or at bedside if portable fluoroscopy or ultrasound guidance is available. The workflow includes review of prior imaging and indications, informed consent, sterile preparation of the catheter site, slow injection of water-soluble contrast via the catheter under fluoroscopic (or CT/ultrasound-assisted) visualization, acquisition of images to delineate cavity morphology and any communicating tracts, interpretation by the performing physician, and documentation of findings and plan (e.g., catheter retention, repositioning, exchange, or removal). Typical staff include the interventional radiologist or surgeon, a radiology technologist, and nursing support for monitoring and sterile assistance. The typical site of service is the hospital outpatient or inpatient radiology/interventional suite; bedside procedures may occur in the inpatient ward or ICU when imaging support is available.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When billing only the physician interpretation component separate from technical resources (rare for this code if bundled).
`59`	Distinct procedural service	When this contrast injection through an existing drain is distinct from other separately reportable procedures performed the same day.
`52`	Reduced services	When the procedure is partially reduced or not completed as planned (e.g., limited contrast study due to intolerance).
`78`	Unplanned return to the operating room by the same physician following initial procedure for a related procedure during the postoperative period	If an unplanned subsequent invasive intervention related to the drain occurs intra- or post-procedure.
`76`	Repeat procedure by same physician	If the same contrast injection study is repeated later the same day by the same physician.
`77`	Repeat procedure by another physician	If another physician repeats the contrast injection study within the same day.
`52`	Reduced services	When a limited or abbreviated catheter contrast study is performed (e.g., minimal contrast due to allergy).
`59`	Distinct procedural service	Use when the injection study is separate from another imaging or drainage procedure occurring the same encounter.
`50`	Bilateral procedure	Not typically applicable but used when bilateral procedures are reportable; usually not used for single-site drain studies.
`TC`	Technical component	When billing only the technical component (imaging equipment, technologist) and the physician bills separately with `26`.
`LT`	Left side	When a laterality modifier is required to indicate the procedure was performed on the left side (if applicable and payer requires laterality).
`RT`	Right side	When a laterality modifier is required to indicate the procedure was performed on the right side (if applicable and payer requires laterality).
`GA`	Waiver of liability statement on file (Alternate: `GC` in provided list)	Use when a voluntary waiver or specific documentation exception applies; use `GC` from provided list to indicate a trainee performed under direct supervision.

Taxonomy Code	Specialty	Notes
207P00000X	Radiology	Interventional radiologists commonly perform catheter contrast studies.
363A00000X	Surgery	General surgeons or surgical specialists may perform or request contrast injection via surgical drains.
208000000X	Emergency Medicine	Inpatients in the emergency or critical care setting may have bedside drain checks by emergency/critical care physicians when imaging support exists.
2083P0002X	Hospitalist/Internal Medicine	Hospitalists coordinate drain management and may arrange radiology-performed drain studies; they do not typically perform the procedure but are key stakeholders.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K65.0`	Acute peritonitis	Peritoneal abscesses or intra-abdominal collections may be evaluated via contrast injection through an existing drainage catheter to assess cavity and communications.
`K65.1`	Chronic peritonitis	Chronic intra-abdominal fluid collections or abscess cavities with indwelling drains may require contrast assessment before catheter removal.
`K68.11`	Postprocedural abscess of abdominal wall	Superficial or abdominal wall abscesses drained percutaneously may be evaluated with catheter contrast to confirm resolution.
`K61.0`	Anal abscess and fistula	Drains or setons for perianal collections may be assessed for residual cavities or fistulous tracts with contrast through existing catheters.
`N13.6`	Pyonephrosis	Renal or perirenal collections with drainage catheters can be assessed with contrast injection to evaluate cavity and catheter position.
`J85.1`	Abscess of lung and mediastinum	Thoracic abscesses with chest drains or catheters may be evaluated with contrast injection through existing catheters to assess cavity or fistula.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`49424`	Injection of contrast material into existing drainage catheter for evaluation of abscess or cyst	This is the primary procedure code describing the targeted contrast injection study through an indwelling drain to assess size, loculation, and communication of the cavity.
`49422`	Percutaneous placement of drainage catheter, percutaneous, with imaging guidance	Often performed before `49424`; initial catheter placement to drain abscesses which may later require contrast injection for reassessment.
`77012`	Fluoroscopic guidance and localization of needle or catheter for contrast injection	Frequently reported when fluoroscopic imaging guidance is separately billable to localize catheters during contrast injection studies if payer allows.
`71260`	CT chest with contrast (single or multiphase)	CT imaging may be performed in conjunction with contrast injection through a catheter to better delineate cavity anatomy and fistulous tracts.
`74170`	CT abdomen and pelvis with contrast	Often performed before or after catheter contrast injection to provide cross-sectional correlation of the abscess cavity and surrounding structures.
`76937`	Ultrasound guidance for drain evaluation or injection	Ultrasound guidance may be used instead of fluoroscopy for bedside contrast injection into superficial collections.

CPT 49423: Abdominal Drainage Catheter Exchange

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
`26`	Professional component	When billing only the physician interpretation component separate from technical resources (rare for this code if bundled).
`59`	Distinct procedural service	When this contrast injection through an existing drain is distinct from other separately reportable procedures performed the same day.
`52`	Reduced services	When the procedure is partially reduced or not completed as planned (e.g., limited contrast study due to intolerance).
`78`	Unplanned return to the operating room by the same physician following initial procedure for a related procedure during the postoperative period	If an unplanned subsequent invasive intervention related to the drain occurs intra- or post-procedure.
`76`	Repeat procedure by same physician	If the same contrast injection study is repeated later the same day by the same physician.
`77`	Repeat procedure by another physician	If another physician repeats the contrast injection study within the same day.
`52`	Reduced services	When a limited or abbreviated catheter contrast study is performed (e.g., minimal contrast due to allergy).
`59`	Distinct procedural service	Use when the injection study is separate from another imaging or drainage procedure occurring the same encounter.
`50`	Bilateral procedure	Not typically applicable but used when bilateral procedures are reportable; usually not used for single-site drain studies.
`TC`	Technical component	When billing only the technical component (imaging equipment, technologist) and the physician bills separately with `26`.
`LT`	Left side	When a laterality modifier is required to indicate the procedure was performed on the left side (if applicable and payer requires laterality).
`RT`	Right side	When a laterality modifier is required to indicate the procedure was performed on the right side (if applicable and payer requires laterality).
`GA`	Waiver of liability statement on file (Alternate: `GC` in provided list)	Use when a voluntary waiver or specific documentation exception applies; use `GC` from provided list to indicate a trainee performed under direct supervision.

Taxonomy Code	Specialty	Notes
207P00000X	Radiology	Interventional radiologists commonly perform catheter contrast studies.
363A00000X	Surgery	General surgeons or surgical specialists may perform or request contrast injection via surgical drains.
208000000X	Emergency Medicine	Inpatients in the emergency or critical care setting may have bedside drain checks by emergency/critical care physicians when imaging support exists.
2083P0002X	Hospitalist/Internal Medicine	Hospitalists coordinate drain management and may arrange radiology-performed drain studies; they do not typically perform the procedure but are key stakeholders.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K65.0`	Acute peritonitis	Peritoneal abscesses or intra-abdominal collections may be evaluated via contrast injection through an existing drainage catheter to assess cavity and communications.
`K65.1`	Chronic peritonitis	Chronic intra-abdominal fluid collections or abscess cavities with indwelling drains may require contrast assessment before catheter removal.
`K68.11`	Postprocedural abscess of abdominal wall	Superficial or abdominal wall abscesses drained percutaneously may be evaluated with catheter contrast to confirm resolution.
`K61.0`	Anal abscess and fistula	Drains or setons for perianal collections may be assessed for residual cavities or fistulous tracts with contrast through existing catheters.
`N13.6`	Pyonephrosis	Renal or perirenal collections with drainage catheters can be assessed with contrast injection to evaluate cavity and catheter position.
`J85.1`	Abscess of lung and mediastinum	Thoracic abscesses with chest drains or catheters may be evaluated with contrast injection through existing catheters to assess cavity or fistula.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`49424`	Injection of contrast material into existing drainage catheter for evaluation of abscess or cyst	This is the primary procedure code describing the targeted contrast injection study through an indwelling drain to assess size, loculation, and communication of the cavity.
`49422`	Percutaneous placement of drainage catheter, percutaneous, with imaging guidance	Often performed before `49424`; initial catheter placement to drain abscesses which may later require contrast injection for reassessment.
`77012`	Fluoroscopic guidance and localization of needle or catheter for contrast injection	Frequently reported when fluoroscopic imaging guidance is separately billable to localize catheters during contrast injection studies if payer allows.
`71260`	CT chest with contrast (single or multiphase)	CT imaging may be performed in conjunction with contrast injection through a catheter to better delineate cavity anatomy and fistulous tracts.
`74170`	CT abdomen and pelvis with contrast	Often performed before or after catheter contrast injection to provide cross-sectional correlation of the abscess cavity and surrounding structures.
`76937`	Ultrasound guidance for drain evaluation or injection	Ultrasound guidance may be used instead of fluoroscopy for bedside contrast injection into superficial collections.

CPT 49423: Abdominal Drainage Catheter Exchange

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 49424: Catheter Contrast Injection for Abscess or Cyst Evaluation

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Billing Code Overview

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CPT 49424: Catheter Contrast Injection for Abscess or Cyst Evaluation

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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