The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to assess peripheral arterial disease (PAD). It compares the blood pressure in the ankle with the blood pressure in the arm to determine how well blood is flowing in the limbs. A low ABI value suggests possible arterial blockages, which can lead to serious complications if untreated.
This article provides an in-depth look at the CPT codes for ABI, their proper usage, billing guidelines, and clinical significance.
cpt code for abi
2. What is a CPT Code?
Current Procedural Terminology (CPT) codes are standardized medical codes used to describe procedures and services performed by healthcare providers. These codes are essential for billing and insurance reimbursement.
For ABI testing, the primary CPT codes are:
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93922 – Non-invasive physiologic studies of upper or lower extremity arteries
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93923 – Duplex scan of lower extremity arteries
3. CPT Code for ABI: Overview and Specifics
Primary CPT Codes for ABI Testing
| CPT Code | Description | Usage |
|---|---|---|
| 93922 | Non-invasive physiologic studies of upper or lower extremity arteries, single-level (e.g., ankle/brachial index) | Used for standard ABI testing without imaging |
| 93923 | Duplex scan of lower extremity arteries or arterial bypass grafts | Used when Doppler ultrasound is included |
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93922 is the most commonly used code for a standard ABI test.
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93923 applies when a duplex scan (ultrasound imaging) is performed alongside pressure measurements.
4. When is ABI Testing Medically Necessary?
ABI testing is typically ordered for patients with:
✔ Symptoms of PAD (leg pain, cramping, non-healing wounds)
✔ Diabetes (increased risk of vascular disease)
✔ History of smoking
✔ High cholesterol or hypertension
✔ Suspected arterial blockages
Medicare and private insurers require proper documentation to justify medical necessity.
5. How is the ABI Test Performed?
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The patient lies flat for 5-10 minutes to stabilize blood pressure.
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Blood pressure cuffs are placed on both arms and ankles.
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A Doppler probe measures systolic pressures.
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The ABI is calculated by dividing the ankle pressure by the brachial (arm) pressure.
Normal ABI: 1.0–1.4
Mild PAD: 0.9–0.99
Moderate PAD: 0.5–0.89
Severe PAD: <0.5
6. CPT Codes for ABI: Detailed Breakdown
93922 – Non-Invasive Physiologic Study
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Covers ABI testing alone.
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Includes segmental pressures if performed.
93923 – Duplex Scan
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Used when ultrasound imaging is required.
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Often billed alongside 93922 if both tests are done.
7. Billing and Reimbursement for ABI Tests
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Medicare covers ABI testing for at-risk patients (e.g., diabetes, PAD symptoms).
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Private insurers may require prior authorization.
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Always document medical necessity to avoid claim denials.
8. Common ABI Coding Mistakes
❌ Using 93922 and 93923 together without proper justification.
❌ Failing to document symptoms justifying the test.
❌ Incorrectly coding ABI with treadmill tests (use 93015 for exercise ABI).
9. ABI vs. Other Vascular Tests
| Test | Purpose | CPT Code |
|---|---|---|
| ABI | Detects PAD using pressure ratios | 93922 |
| TBI (Toe-Brachial Index) | Assesses small vessel disease | 93922 (with modifier) |
| PVR (Pulse Volume Recording) | Measures blood flow volume | 93922 |
| Segmental Pressures | Evaluates blockages at different levels | 93922 |
10. Frequently Asked Questions (FAQs)
Q1: What is the difference between CPT 93922 and 93923?
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93922 is for pressure measurements (ABI).
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93923 includes ultrasound imaging.
Q2: Does Medicare cover ABI testing?
Yes, if medically necessary (e.g., diabetes, PAD symptoms).
Q3: Can ABI be performed at home?
No, it requires a trained professional and specialized equipment.
Q4: What is a normal ABI value?
1.0–1.4 is normal; <0.9 suggests PAD.
11. Conclusion
The CPT code for ABI (93922) is crucial for diagnosing PAD and ensuring proper reimbursement. Understanding when to use 93922 vs. 93923, documenting medical necessity, and avoiding coding errors are key for accurate billing. ABI remains a vital tool in vascular assessment, helping prevent complications like limb ischemia and stroke.
