What code would I use for the following scenario: A patient had a history of bilateral lower extremity pain. Ultrasound of the right and left lower extremity was performed using a low-frequency linear array transducer. Color Doppler duplex evaluation of common femoral, superficial femoral, popliteal, posterior tibial, and peroneal veins performed. The CFV through the popliteal veins were evaluated with both compression and response to augmentation and Valsalva. There is no evidence of DVT.