37212

Transcatheter Venous Thrombolytic Infusion; Initial Treatment Day

CPT code 37212 describes the first calendar day of transcatheter thrombolytic therapy specifically targeted at the venous system. This procedure is a cornerstone in the management of extensive or limb-threatening deep vein thrombosis (DVT). The process begins with the clinician establishing percutaneous access to the venous system, often through the popliteal, femoral, or internal jugular veins, using ultrasound guidance for safety. Under fluoroscopic imaging, a guidewire is carefully navigated through the thrombosed segment of the vein. Once the path is established, a specialized multi-sidehole infusion catheter is positioned so that the infusion holes are directly embedded within the length of the clot matrix. A fibrinolytic agent, such as recombinant tissue plasminogen activator (rtPA) or urokinase, is then administered via the catheter, either as a continuous drip or in pulses. The goal of this direct delivery is to maximize the concentration of the thrombolytic drug at the site of the clot while minimizing systemic exposure and the associated risks of major bleeding. The 'initial treatment day' designation encompasses all physician work performed on the day the infusion is started. This includes the technical work of catheter placement, the initiation of the pharmacologic agent, and the intensive clinical monitoring required thereafter. Clinicians must closely observe the patient for signs of intracranial hemorrhage, gastrointestinal bleeding, or hematoma at the access site. Frequent laboratory monitoring of fibrinogen levels and coagulation profiles (such as PTT) is standard practice to titrate the dosage safely. This code also covers any necessary repositioning of the catheter or adjustments to the infusion parameters within that first calendar day. By rapidly lysing the venous obstruction, 37212 helps preserve venous valvular function and significantly reduce the long-term incidence of post-thrombotic syndrome.

Clinical Indications

  • Acute iliofemoral deep vein thrombosis (DVT)
  • Extensive upper extremity deep vein thrombosis
  • Paget-Schroetter syndrome (axillosubclavian effort thrombosis)
  • May-Thurner syndrome with acute thrombotic occlusion
  • Thrombosis of a venous stent or venous bypass graft
  • Symptomatic acute venous thrombosis with high risk of post-thrombotic syndrome
  • Phlegmasia cerulea dolens

Procedure Steps

  1. Identify the target vein and site of occlusion using pre-procedural imaging.
  2. Obtain percutaneous venous access using ultrasound guidance (typically popliteal or femoral).
  3. Perform an initial diagnostic venogram to define the proximal and distal extent of the thrombus.
  4. Traverse the thrombosed segment with a guidewire and a support catheter under fluoroscopic guidance.
  5. Exchange the support catheter for a multi-sidehole infusion catheter, ensuring the infusion segment spans the thrombus.
  6. Initiate the infusion of the thrombolytic agent via a programmable infusion pump.
  7. Secure the catheter and vascular sheath to the skin to prevent migration.
  8. Monitor the patient in an intensive care or step-down unit for signs of bleeding or complications.
  9. Perform serial laboratory evaluations of coagulation parameters (PTT, INR, Fibrinogen).
  10. Document the initial infusion rate and the patient's hemodynamic status.

Coding Guidelines

  • Use 37212 for the initial day of venous infusion; for arterial infusion, use 37211.
  • The code 37212 includes the initial catheter placement and all radiological supervision and interpretation (S&I) related to the infusion.
  • Do not report 37212 in conjunction with diagnostic venography (e.g., 75820, 75822) unless it is performed as a separate, distinct diagnostic study.
  • Subsequent days of treatment (following the first calendar day) should be reported with 37213.
  • The final day of treatment, which includes the cessation of infusion and catheter removal, is reported with 37214.
  • If the physician performs mechanical thrombectomy in addition to thrombolysis, refer to 37187 or 37188.
  • Report only one 'initial' infusion code per treatment course, even if multiple catheters are used for the same thrombus.

Associated ICD-10 Codes