CPT Code 93970: Duplex Scan of Extremity Veins

CPT 93970 is generally limited to two times within a consecutive 12-month period, per code, by any provider for the same recipient. Providers must document new or worsening symptoms to bill more frequently and establish clear medical necessity supported by the patient's clinical history and progress notes.

The CPT codes for venous Doppler of the lower extremities are 93970 for a complete bilateral study and 93971 for a unilateral or limited study. These codes assess blood flow in deep and superficial veins using duplex ultrasound.

CPT 93970 is used for a complete bilateral duplex scan of extremity veins, covering both legs or arms, including deep and superficial veins. In contrast, CPT 93971 is for a unilateral or limited study, meaning only one limb is assessed or the exam is not fully comprehensive. Proper selection depends on the extent of the procedure performed and documented.