32408

Core needle biopsy, lung or mediastinum, percutaneous, including imaging guidance, when performed

CPT code 32408 represents a percutaneous core needle biopsy of the lung or mediastinum, inclusive of all necessary imaging guidance. This minimally invasive diagnostic procedure is primarily indicated for evaluating indeterminate pulmonary nodules, lung masses, or mediastinal lesions identified on prior cross-sectional imaging (such as CT scans or PET/CT). The primary goal is to obtain adequate tissue architecture for histopathological, immunohistochemical, and molecular profiling, which is crucial in the era of targeted oncology therapy, while avoiding the morbidity associated with open or video-assisted thoracic surgery (VATS). The procedure is performed under local anesthesia, frequently combined with intravenous conscious sedation to ensure patient comfort and minimize respiratory motion. The patient is carefully positioned based on the safest and shortest trajectory to the targeted lesion—most often in a prone, supine, or lateral decubitus position. Utilizing real-time or step-and-shoot imaging guidance (most commonly Computed Tomography [CT] or cone-beam CT, though ultrasound may be utilized for pleural-based or highly peripheral lesions, and fluoroscopy or MRI in rare instances), the physician precisely identifies the target. They then map out the safest percutaneous trajectory to avoid traversing emphysematous bullae, major pulmonary or mediastinal vessels, fissures, or extensive normal lung parenchyma, which reduces the risk of pneumothorax and hemorrhage. A coaxial needle technique is typically employed. After meticulously anesthetizing the skin, subcutaneous tissues, intercostal muscles, and parietal pleura, a larger guide needle (introducer) is advanced to the very edge of the lesion under continuous or intermittent image guidance. A specialized core biopsy needle is then passed through the lumen of the introducer directly into the lesion, and its spring-loaded or automated cutting mechanism is deployed to shear off and capture a well-preserved cylindrical tissue core. Multiple passes may be made through the single coaxial introducer to ensure a sufficient tissue yield for all necessary testing. Once the required samples are securely obtained and placed in appropriate transport media, the introducer is removed. Immediate post-procedure imaging is routinely performed to evaluate for potential acute complications, most notably pneumothorax or intraparenchymal hemorrhage. Because imaging guidance is explicitly included in the descriptor for CPT code 32408, codes for fluoroscopic, ultrasound, CT, or MRI guidance are never reported separately.

Clinical Indications

  • Indeterminate solitary pulmonary nodule identified on imaging
  • Suspected primary lung carcinoma requiring histological confirmation and molecular profiling
  • Suspected metastatic disease to the lung or mediastinum from an extrathoracic primary malignancy
  • Mediastinal mass of unknown etiology (e.g., suspected thymoma, lymphoma, or germ cell tumor)
  • Suspected infectious or granulomatous disease (e.g., tuberculosis, atypical mycobacteria, sarcoidosis, fungal infection) when less invasive testing is unyielding
  • Acquisition of additional tissue in known advanced lung cancer cases to test for new actionable mutations or resistance mechanisms

Procedure Steps

  1. Review pre-procedural cross-sectional imaging to plan the optimal percutaneous trajectory.
  2. Position the patient appropriately (supine, prone, or lateral decubitus) to optimize access and stability.
  3. Perform a preliminary imaging scan (e.g., CT or ultrasound) to localize the target lesion and mark the skin entry site.
  4. Prep and drape the skin using standard sterile technique.
  5. Administer local anesthesia to the skin, subcutaneous tissues, intercostal musculature, and parietal pleura along the planned needle tract.
  6. Under continuous or intermittent imaging guidance, insert a coaxial introducer needle through the chest wall to the margin of the target lesion.
  7. Introduce a core biopsy needle through the coaxial introducer into the lesion.
  8. Deploy the cutting mechanism of the core biopsy needle to capture a cylindrical sample of tissue.
  9. Withdraw the core needle and extract the tissue sample, leaving the introducer in place.
  10. Repeat the core sampling process as necessary to obtain adequate tissue volume for pathology and molecular testing.
  11. Remove the coaxial introducer needle completely and apply pressure/sterile dressing to the puncture site.
  12. Perform immediate post-biopsy imaging (e.g., chest CT scan or radiograph) to assess for acute complications such as pneumothorax or intraparenchymal hemorrhage.

Coding Guidelines

  • Do not report imaging guidance codes (e.g., 76942, 77002, 77012, 77021) in conjunction with 32408, as imaging guidance is inherently included in the code descriptor.
  • CPT code 32408 replaces the deleted code 32405. The primary difference is the bundling of imaging guidance into 32408.
  • If a fine needle aspiration (FNA) (e.g., 10005-10012) and a core biopsy (32408) are performed on the same lesion during the same encounter, follow NCCI edits. Usually, the core biopsy includes the FNA when performed on the same lesion.
  • If biopsies are performed on separate, distinct lesions, use appropriate modifiers (e.g., modifier 59 or XU) to denote the separate anatomic sites, supported by clear documentation.
  • For percutaneous needle biopsy of the pleura, use CPT code 32400 instead of 32408.
  • Evaluation and Management (E/M) services are generally not reported on the same date of service unless a significant, separately identifiable E/M service is provided, which would require modifier 25.

Associated ICD-10 Codes