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What code should we use for venous sampling? The provider only has 36500 and 75893. "Thereafter, I used high resolution real-time ultrasound, identified the right common femoral vein, infiltrated 1% lidocaine, and punctured into the vein under ultrasound guidance during a permanent image. I advanced a guidewire, then exchanged the puncture needle for a 6 French vascular sheath. I used a series of diagnostic catheters to sample multiple venous sites, including the right and left subclavian and brachiocephalic veins, right and left internal jugular veins, superior thyroidal veins, right and left vertebral plexus, azygos vein, left internal mammary vein, thymic vein, superior vena cava, and right atrium. All samples were sent to the lab for analysis, and the results were reported before the end of the day."