CPT® Code 37209

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The procedure described by CPT® Code 37209 involves the exchange of a previously placed intravascular catheter during thrombolytic therapy. This procedure is necessary when the existing thrombolytic catheter, which has been delivering medication to dissolve a blood clot (thrombosis), is found to be inadequate for continued treatment. The physician evaluates the current catheter's effectiveness and determines that a new catheter is needed to facilitate the infusion of thrombolytics at a different thrombosis site within the same blood vessel. This exchange process is critical for ensuring that the thrombolytic therapy can continue effectively, targeting the new site of thrombosis without interruption. The procedure requires careful manipulation of a guidewire to navigate to the new site, ensuring that the new catheter is correctly positioned for optimal therapeutic effect.