Summary & Overview
CPT 49400: Intraperitoneal Injection of Air or Contrast for Imaging
CPT code 49400 designates the injection of air or contrast material into the abdominal cavity to improve visualization of intra‑abdominal organs on a separately performed radiologic study. This technique supports diagnostic imaging by creating intraperitoneal contrast that can reveal organ contours, fluid collections, or leaks not otherwise visible. Nationally, the code is relevant for hospitals and outpatient imaging centers that perform advanced diagnostic procedures involving radiologic guidance. Payers commonly involved in coverage and reimbursement for this service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication provides a concise briefing on clinical context and billing considerations for CPT code 49400. Readers will find an overview of the procedure’s clinical purpose and typical settings of service, a summary of common payer coverage considerations, and references to related billing elements where available. The report aims to clarify coding intent and situational use so that revenue cycle and clinical teams can locate applicable guidance quickly. Data not available in the input is noted where relevant, and readers will receive a high‑level orientation to follow‑on materials that address benchmarks, policy updates, and payer‑specific documentation expectations.
Billing Code Overview
CPT code 49400 describes a diagnostic procedure in which a provider injects air or contrast material into the abdominal cavity to enhance visualization of intra‑abdominal organs and structures during a separately performed radiological study. This procedure is used to create contrast within the peritoneal space so that organs, potential leaks, or anatomical relationships are more clearly delineated on imaging.
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Service type: Diagnostic intraperitoneal contrast/air injection to facilitate radiologic imaging
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Typical site of service: Hospital radiology suite or outpatient imaging center, with the procedure performed by a qualified clinician and imaging completed in an associated radiology setting
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult admitted to a hospital or presenting to an outpatient radiology suite for evaluation of suspected intra-abdominal pathology where enhanced visualization of abdominal organs is needed during fluoroscopic or radiographic imaging. For example, a 46-year-old female with intermittent abdominal pain and prior abdominal surgery undergoes a diagnostic radiologic study for suspected bowel obstruction or to evaluate postoperative adhesions. The interventionalist or radiologist performs an intraperitoneal air or contrast injection (peritoneal insufflation or pneumoperitoneum with air/contrast) immediately before the separately performed radiographic study to outline bowel loops, demonstrate free intraperitoneal air, or delineate organ contours. Typical workflow: pre-procedure consent and review of indications and allergies; sterile preparation and local anesthesia; insertion of a small-gauge needle or catheter into the peritoneal cavity; controlled injection of air or iodinated contrast under aseptic technique; monitoring for patient tolerance and immediate imaging performed by radiology (fluoroscopy, CT, or radiographs); post-procedure observation for complications such as bowel perforation, abdominal pain, or contrast extravasation. Typical sites of service include the hospital inpatient unit, hospital outpatient radiology department, or ambulatory surgical center depending on clinical acuity and concurrent procedures. The service is reported in conjunction with the separately performed radiological study; it represents the injection/insufflation and not the imaging interpretation or imaging technical component.
Coding Specifications
| Modifier | Description | When to Use |
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