36901

Introduction of needle(s) and/or catheter(s), dialysis circuit, with diagnostic angiography

CPT 36901 represents the fundamental diagnostic procedure for evaluating a dialysis circuit, which includes either an arteriovenous fistula (AVF) or an arteriovenous graft (AVG). The procedure is designed to visualize the entire vascular anatomy of the dialysis access, starting from the arterial anastomosis through the entire venous outflow, extending to the central veins such as the superior vena cava or inferior vena cava. The dialysis circuit is clinically defined as the vessel beginning at the arterial anastomosis and ending at the level of the central veins. This code is inclusive of all the work required to perform the diagnostic study, including the percutaneous access (needle or catheter placement) into the dialysis circuit, any necessary catheter manipulations within the circuit, the administration of contrast material, and the radiological supervision and interpretation. Because this is a bundled code, it incorporates all imaging from the arterial inflow to the central venous outflow. The physician performs this procedure when a patient exhibits signs of access dysfunction, such as decreased flow rates during dialysis, elevated venous pressures, or physical findings like a diminishing thrill or a high-pitched bruit. By performing this angiography, the physician can identify the anatomical location and severity of stenoses, thrombi, or aneurysmal changes that may be causing the clinical issues. It is important to note that 36901 is strictly diagnostic; if a therapeutic intervention such as angioplasty or thrombectomy is performed during the same session, higher-level codes in the 36902-36906 range must be utilized instead.

Clinical Indications

  • Decreased blood flow rates during hemodialysis (e.g., flow < 300 ml/min).
  • Elevated venous pressures during dialysis sessions.
  • Persistent swelling of the limb containing the dialysis access.
  • Physical exam findings suggesting stenosis, such as loss of thrill or development of a high-pitched bruit.
  • Prolonged bleeding from needle sites after dialysis.
  • Aneurysmal enlargement of the fistula or graft.
  • Recurrent collapse of the fistula during dialysis (suggesting arterial inflow stenosis).
  • Clinical suspicion of central venous stenosis or occlusion.
  • Evaluation of a newly created fistula that has failed to mature.

Procedure Steps

  1. The patient is positioned, and the dialysis access site is prepped and draped in a sterile fashion.
  2. Local anesthesia is administered at the intended site of percutaneous entry into the dialysis circuit.
  3. A needle is introduced into the dialysis circuit (fistula or graft) under clinical or ultrasound guidance.
  4. A guidewire is advanced through the needle into the circuit, and the needle is exchanged for a sheath or catheter.
  5. The physician performs a series of contrast injections (angiography) to visualize the arterial anastomosis, the body of the circuit, and the venous outflow.
  6. Fluoroscopic imaging is used to track the contrast media and identify areas of narrowing, blockage, or other structural abnormalities.
  7. The catheter or sheath is manipulated as needed to provide optimal visualization of the entire circuit through the central veins (SVC or IVC).
  8. Radiological images are recorded, and the physician interprets the findings to determine the cause of dysfunction.
  9. The catheter/sheath is removed, and manual pressure is applied to the puncture site to achieve hemostasis.
  10. A formal report is documented detailing the findings of the angiography.

Coding Guidelines

  • 36901 is used for diagnostic angiography of the dialysis circuit when no interventional procedures (like angioplasty or thrombectomy) are performed.
  • The dialysis circuit is defined as starting at the arterial anastomosis and extending through the entire venous outflow to the central veins (SVC/IVC).
  • This code includes all catheter placements, injections, and imaging interpretations within the dialysis circuit.
  • Do not report 36901 in conjunction with 36902, 36903, 36904, 36905, or 36906 for the same session; the interventional codes include the diagnostic work.
  • If ultrasound guidance is used for the initial vascular access, it is generally considered bundled or may be reported separately (e.g., 76937) only if specific documentation requirements are met and the payer allows.
  • Contrast administration and all necessary imaging interpretation and reports are included in the 36901 bundle.
  • For angiography of the arterial system outside the dialysis circuit (e.g., more proximal arterial anatomy), use the appropriate arterial angiography codes with modifier 59.

Associated ICD-10 Codes