93923

Noninvasive physiologic studies of upper or lower extremity arteries, multiple levels or with provocative functional maneuvers, complete bilateral study

Noninvasive physiologic studies of upper or lower extremity arteries (CPT code 93923) are comprehensive diagnostic evaluations utilized to assess arterial blood flow and identify the presence, location, and severity of peripheral arterial disease (PAD). This complete bilateral study evaluates arterial hemodynamics across multiple levels of the extremities. The procedure typically involves segmental blood pressure measurements, where pneumatic cuffs are placed at various levels along the limbs—such as the high thigh, above the knee, below the knee, ankle, calf, or the arm and forearm. By sequentially inflating these cuffs and utilizing a continuous-wave Doppler ultrasound probe, clinicians can accurately detect systolic blood pressures at each anatomic segment. This allows for the calculation of critical diagnostic metrics like the Ankle-Brachial Index (ABI) or Toe-Brachial Index (TBI), which are foundational in diagnosing PAD. Furthermore, segmental Doppler waveform analysis and segmental volume plethysmography (PVR) are performed concurrently to evaluate the pulsatile changes in limb volume and blood flow velocity. A healthy, normal multiphasic waveform may distinctly become biphasic or monophasic distal to a significant arterial stenosis or occlusion, indicating altered hemodynamics. This specific CPT code also encompasses transcutaneous oxygen tension measurements if they are performed, as well as provocative functional maneuvers. Provocative tests, such as treadmill exercise testing or reactive hyperemia, are highly instrumental in unmasking mild to moderate arterial disease that may not be apparent when the patient is at rest. Patients who present with classic symptoms of intermittent claudication, ischemic rest pain, trophic skin changes, diminished or absent pulses, or non-healing extremity ulcers are prime candidates for this noninvasive assessment. To appropriately report code 93923, the study must be a complete bilateral assessment involving at least three levels of the lower extremities or two levels of the upper extremities. If only a single level is evaluated, or if the study is unilateral, an alternative code (such as 93922) should be utilized per current coding guidelines. The resulting data provides critical insights for vascular surgeons, cardiologists, and primary care physicians to accurately stage arterial disease and effectively plan subsequent endovascular interventions, surgical bypass procedures, or optimized medical management strategies.

Clinical Indications

  • Peripheral arterial disease (PAD) evaluation
  • Intermittent claudication during exertion
  • Ischemic rest pain in the extremities
  • Non-healing ulcers or gangrene of the digits/limbs
  • Diminished or absent peripheral pulses
  • Trophic skin changes indicating chronic ischemia
  • Pre-operative evaluation for arterial bypass surgery or endovascular intervention
  • Post-operative surveillance of vascular bypass grafts or stents

Procedure Steps

  1. The patient rests in a supine position in a temperature-controlled room for 10 to 15 minutes to establish baseline resting hemodynamics.
  2. Pneumatic cuffs are applied bilaterally to multiple anatomic levels of the upper or lower extremities (e.g., high thigh, low thigh, calf, and ankle).
  3. Baseline brachial artery systolic pressures are measured bilaterally using a continuous-wave Doppler ultrasound probe.
  4. The extremity cuffs are sequentially inflated above the expected systolic pressure and slowly deflated while monitoring a distal artery (e.g., dorsalis pedis or posterior tibial) with the Doppler probe to record segmental systolic pressures.
  5. Doppler velocity waveforms and/or segmental volume plethysmography (PVR) tracings are recorded at each level to evaluate flow characteristics (triphasic, biphasic, monophasic).
  6. If indicated, the patient undergoes provocative functional maneuvers, such as standardized treadmill exercise or reactive hyperemia testing.
  7. Immediately following the provocative maneuver, post-exertional pressures and waveforms are rapidly reassessed and recorded at timed intervals until baseline parameters recover.
  8. Ankle-Brachial Indices (ABI) or Toe-Brachial Indices (TBI) are calculated using the recorded pressure data.
  9. The interpreting physician reviews all pressures, indices, waveforms, and provocative test responses to generate a comprehensive diagnostic report detailing the presence and severity of arterial obstruction.

Coding Guidelines

  • CPT 93923 is strictly for a complete bilateral study evaluating multiple levels (at least three lower extremity levels or two upper extremity levels).
  • Do not report 93923 in conjunction with 93922 (limited study) or 93924 (lower extremity study with specific exercise testing) for the same extremities during the same encounter.
  • If the study performed evaluates only a single level or is intentionally limited/unilateral, CPT 93922 should be reported instead.
  • If a complete study is intended but medical circumstances limit the exam to a unilateral study, append modifier 52 (Reduced Services) to 93923.
  • Medical necessity must be clearly documented, typically citing specific symptoms like claudication or rest pain, or physical findings such as absent pulses or non-healing ulcers.
  • Provocative functional maneuvers are included in this code if performed, but their absence does not invalidate the code if multiple levels were studied bilaterally.

Associated ICD-10 Codes