37184

Primary Percutaneous Mechanical Thrombectomy, Arterial, Initial Vessel

CPT 37184 describes a primary percutaneous transluminal mechanical thrombectomy performed on an arterial vessel or an arterial bypass graft. This procedure is characterized by the use of specialized mechanical devices—such as rheolytic, rotational, or suction-based systems—designed to fragment, macerate, and/or aspirate thrombus from the vessel lumen to restore blood flow. The term 'primary' signifies that the thrombectomy is the main objective of the intervention, often triggered by a symptomatic acute or subacute occlusion, rather than a corrective measure for a complication occurring during a different endovascular procedure (which would be reported as secondary thrombectomy under code 37186). The procedure begins with obtaining percutaneous access, typically via the common femoral artery, followed by the insertion of a sheath. Using fluoroscopic guidance, a guidewire is advanced across the thrombotic lesion. The mechanical thrombectomy device is then navigated over the wire into the target vessel. Once positioned, the device is activated to clear the blockage. This process may involve multiple passes of the catheter to achieve adequate luminal patency. Clinical decision-making is based on the restoration of distal perfusion and the reduction of thrombus burden as visualized on intraprocedural angiography. The code 37184 specifically covers the initial vessel treated; if additional distinct vessels are treated in the same session, add-on codes are utilized. It encompasses the mechanical work and any intraprocedural injections for imaging the treated segment, but selective catheterization of the vessel is usually reported separately.

Clinical Indications

  • Acute limb ischemia (ALI) due to arterial embolism or thrombosis
  • Acute or subacute occlusion of a peripheral arterial bypass graft
  • Symptomatic mesenteric or visceral arterial thrombosis
  • Acute arterial occlusion preventing distal perfusion in the upper or lower extremities
  • Thrombus-burdened lesions where balloon angioplasty or stenting alone is insufficient

Procedure Steps

  1. Obtain percutaneous vascular access using the Seldinger technique, typically in the common femoral or brachial artery.
  2. Perform a diagnostic angiogram to identify the location, extent, and nature of the thrombus.
  3. Advance a guidewire across the thrombotic occlusion under fluoroscopic guidance.
  4. Select and prepare the mechanical thrombectomy device (e.g., AngioJet, Penumbra, or Rotarex).
  5. Advance the thrombectomy catheter over the guidewire to the site of the occlusion.
  6. Activate the device to macerate or aspirate the thrombus; multiple passes may be required to clear the vessel.
  7. Perform follow-up angiography to assess the degree of recanalization and distal runoff.
  8. Address any underlying stenotic lesions (e.g., with PTA or stenting) if necessary after the thrombus is cleared.
  9. Remove the device and sheath, and achieve hemostasis at the access site using manual pressure or a closure device.

Coding Guidelines

  • 37184 represents the initial vessel treated in a primary arterial mechanical thrombectomy session.
  • Use add-on code +37185 for each additional arterial vessel treated during the same session.
  • Do not report 37184 in conjunction with 37186 (secondary thrombectomy), as 37186 is for thrombus removal during another procedure.
  • Catheter placements (e.g., 36245-36248) are separately reportable and not bundled into 37184.
  • Fluoroscopic guidance and intraprocedural injections for imaging the treated vessel are included in 37184 and should not be reported separately.
  • If pharmacological thrombolysis (e.g., 37211) is performed during the same session as mechanical thrombectomy, check for NCCI edits, as they are often bundled if performed through the same access segment.

Associated ICD-10 Codes