In most physician offices, an ABI test does not have to be performed by the physician personally. Trained clinical staff can apply the cuffs and record the pressures, and the study can still be reported, as long as the practice satisfies several separate requirements that are easy to confuse with one another.
The reason the question of who can perform an ABI test causes so much confusion is that four different rules apply at the same time, and each one answers a different question:
- State scope of practice determines who is legally permitted to perform the measurement on a patient.
- Medicare’s diagnostic test supervision rules determine where the physician has to be while the study runs.
- Your Medicare Administrative Contractor’s (MAC) local coverage determination determines what credentials or laboratory accreditation the performing person or facility needs.
- Your training program determines whether the resulting number is actually accurate.
Practices tend to research only the first rule, assume the second, and discover the third during an audit. The seven rules below walk through each layer in the order a practice actually needs them, using the current Medicare coverage language and the published clinical evidence on ABI technique.
1. Who can perform an ABI test in a physician office?
The short answer: a physician, or a trained non-physician member of the clinical team working under the appropriate level of physician supervision.
Medicare’s local coverage determination for Non-Invasive Vascular Studies (L34045) states plainly that “a vascular diagnostic study may be personally performed by a physician or a technologist.” Nothing in the coverage language requires the billing physician to hold the cuff.
The published clinical literature reflects the same reality. The StatPearls review of the ankle-brachial index notes that the test is used by physicians, nurse practitioners and physician extenders, and nurses, and that in general practice settings nurses were found to be the highest utilizer of the tool. An ABI test is a non-invasive pressure measurement, not a procedure that requires an operating room or a sedated patient.
That is the permissive part of the answer. The rest of this guide covers the conditions attached to it.
2. Why “incident to” rules do not decide who can perform an ABI test
This is the single most common mistake, and it usually comes from a practice manager who knows the incident-to rules well and applies them by habit.
Diagnostic tests are not billed incident to. Medicare treats the diagnostic test benefit as separate and distinct from the incident-to benefit, and the regulations are explicit that diagnostic tests need not meet the incident-to requirements. That means the familiar incident-to conditions you may have memorized, such as the physician having initiated the course of treatment and remaining actively involved, are simply the wrong framework for an ABI study.
Diagnostic tests carry their own supervision standard instead. Getting this distinction right matters in both directions: a practice that applies incident-to rules may impose restrictions Medicare never asked for, while a practice that assumes incident-to flexibility may miss the supervision level the test actually requires.
3. What level of physician supervision does an ABI test require?
All diagnostic tests payable under the Medicare Physician Fee Schedule must be furnished under an assigned level of physician supervision. There are three levels, and the difference between them is purely a question of where the physician has to be.
| Supervision level | What it requires |
|---|---|
| General | The procedure is furnished under the physician’s overall direction and control, but the physician’s presence is not required during the performance of the procedure. |
| Direct | The physician must be present in the office suite and immediately available to furnish assistance and direction throughout the performance of the procedure. The physician does not need to be in the room. |
| Personal | A physician must be in attendance in the room during the performance of the procedure. |
Here is the part that practices should not guess at. The required supervision level is assigned per CPT code and published by CMS as part of the Medicare Physician Fee Schedule Database, where a physician supervision indicator identifies which level applies. Before your first study, look up the exact code you intend to report in the CMS Physician Fee Schedule Look-up Tool, or confirm it with your MAC, and record the answer in your protocol. Supervision indicators are maintained by CMS and can be revised, which is precisely why the answer to who can perform an ABI test should be verified against the current file rather than inherited from a vendor’s brochure.
4. Do you need a credentialed vascular technologist?
Sometimes. This is the layer most often missed, and it varies by MAC jurisdiction, so it has to be checked against your own contractor’s policy rather than a national rule of thumb.
LCD L34045 sets out personnel and accreditation standards for non-invasive vascular studies, and for areas under CGS Administrators jurisdiction it requires that all non-invasive vascular diagnostic studies be performed under at least one of the following arrangements:
- performed by a physician who is competent in diagnostic vascular studies, or under the general supervision of physicians who have demonstrated minimum entry level competency by being credentialed in vascular technology; or
- performed by a technician who is certified in vascular technology; or
- performed in facilities with laboratories accredited in vascular technology.
Those are alternatives, not a stacked checklist. A practice satisfies the standard by meeting any one of them, which is why an independent office without a registered vascular technologist on payroll is not automatically excluded. The physician competency pathway exists for exactly that situation.
The same LCD lists examples of appropriate personnel certification, including the Registered Physician in Vascular Interpretation (RPVI), Registered Vascular Technologist (RVT), Registered Cardiovascular Technologist (RCVT), Registered Vascular Specialist (RVS), and American Registry of Radiologic Technologists (ARRT) credentials in vascular sonography. Appropriate laboratory accreditation includes the American College of Radiology (ACR) Vascular Ultrasound Program and vascular laboratory accreditation from the Intersocietal Accreditation Commission, which appears in older policy language under its former name, ICAVL.
Because this requirement was written into a specific contractor’s jurisdiction, the practical instruction is unavoidable: open the LCD that applies to your MAC and read the personnel section before you schedule the first patient. Two practices in different states can both be right and still have different answers.
5. How IDTF rules change who can perform an ABI test
If your testing operation is enrolled as an Independent Diagnostic Testing Facility (IDTF), a stricter set of rules applies and, in the LCD’s own words, those credentialing requirements supersede the ones above.
Under 42 CFR 410.33, the supervising physician must evidence proficiency in the performance and interpretation of each type of diagnostic procedure the IDTF performs. Any non-physician personnel the IDTF uses must demonstrate basic qualifications and have training and proficiency evidenced by licensure or certification from the appropriate state health or education department. Where no state licensing board exists, the technician must be certified by an appropriate national credentialing body, and the IDTF must keep that documentation available for review.
Most independent physician practices adding in-office testing are not IDTFs, so these rules will not apply to them. The distinction is worth confirming rather than assuming, because the answer changes what your staff files need to contain. If you are still choosing the equipment itself, our guide on how to choose an in-office ABI machine walks through what to check before you buy.
6. Why training matters more than the job title
Everything above is about permission. This rule is about accuracy, and it is the one that decides whether the test helps the patient.
The evidence on ABI technique is genuinely sobering. The StatPearls review reports that only about one-third of providers who said they performed the procedure demonstrated “correct” use of it. A randomized controlled trial found that experiential learning significantly improved the ability to perform the test correctly and accurately compared with didactic instruction alone. Because of operator variability, a suggested minimal significant difference between recorded values is 0.15, which is a wide margin when the diagnostic threshold itself sits at 0.9.
Small technique errors move the number in ways that change the interpretation:
- Patient position. The patient should be supine. Testing while seated has been documented to increase the ABI value by approximately 0.3.
- Rest period. Guidelines recommend a rest period ranging from 10 to 30 minutes before the measurement.
- Cuff size. Cuff width should be at least 40% of the limb circumference.
- Nicotine. Smoking selectively affects ankle pressure without affecting brachial pressure, producing artificially elevated values.
- Inflation technique. The cuff is inflated 20 to 30 mm Hg above the last audible sound before pressure is slowly released.
For reference, the 2024 ACC/AHA guideline classifies a resting ABI of 1.00 to 1.40 as normal, 0.91 to 0.99 as borderline, 0.90 or below as abnormal and diagnostic of PAD, and above 1.40 as noncompressible, which usually reflects vessel stiffening. A seated patient who skipped the rest period can be pushed across one of those boundaries by technique alone. This is why the honest answer to who can perform an ABI test is “whoever your practice has actually trained and verified,” rather than any particular job title on a badge.
7. What to document before your first ABI test
The LCD is direct about why documentation matters: “the accuracy of non-invasive vascular diagnostic studies depends on the knowledge, skill, and experience of the technologist and interpreter.” It further requires that the physician performing or interpreting the study be capable of demonstrating documented training and experience, and maintain any applicable documentation.
Before the first study, a practice should have the following on file:
- A referral for each study. The LCD states that a referral must be on record for each non-invasive study performed, and that a referral for one type of study does not qualify as a referral for all tests.
- The supervision level for the specific code you report, taken from the Medicare Physician Fee Schedule Database and dated.
- Which LCD pathway you satisfy, whether that is physician competency, a certified technician, or an accredited laboratory.
- Documented training and experience for the interpreting physician, plus a competency record for each staff member who performs the study.
- A written technique protocol covering rest period, supine positioning, and cuff sizing, so results stay comparable between operators and over time.
Writing down who can perform an ABI test in your practice, and the specific authority you are relying on, turns a verbal understanding into something that survives staff turnover and an audit request.
When a complete bilateral study is reported under ABI CPT code 93923, that documentation is what supports the claim. Our 93923 billing guide covers the coding and medical necessity side in detail.
Staffing an in-office vascular testing program
HealthWright Technologies is a Georgia-based healthcare technology company that has supplied diagnostic and therapeutic devices to independent physicians since 2000. Our CMAT Advantage program is built around the reality described above: the device is the easy part, and the staffing, training, and implementation work is what determines whether an in-office program produces reliable studies.
Every CMAT Advantage placement includes device training, implementation support, and ongoing support for the clinical team who will run the studies. Practices across a range of specialties have used the same model, including podiatry, primary care, cardiology, and nephrology. For practices evaluating in-office diagnostics as an ancillary service line, staffing capacity is usually the deciding constraint rather than the equipment itself.
One boundary is worth stating plainly. Training on a device is not the same thing as credentialing, and no vendor can confer an RVT or an RPVI on your staff or promise how a payer will adjudicate a claim. Credentialing, LCD compliance, and payer policy remain the practice’s responsibility. What a vendor can do is make sure the people running the test know how to run it correctly.
To talk through who can perform an ABI test in your practice and what an in-office vascular testing program would require, see our product overview, browse the resource library, or contact our team at contact@healthwrighttechnologies.com. HealthWright Technologies, 60 Bear Creek Marina Road, Mansfield, GA 30055.
Frequently asked questions
Who can perform an ABI test in a private practice?
A physician may perform the study personally, or a trained member of the clinical team may perform it under the physician supervision level assigned to the code. Medicare’s LCD for non-invasive vascular studies states that a vascular diagnostic study may be personally performed by a physician or a technologist. Your state scope-of-practice law and your MAC’s LCD personnel requirements both apply on top of that.
Can a medical assistant perform an ABI test?
It depends on your state’s scope-of-practice rules and on the personnel requirements in your MAC’s local coverage determination. Some jurisdictions, such as areas under CGS Administrators, require that the study be performed by a physician competent in vascular studies, under the general supervision of a physician credentialed in vascular technology, by a technician certified in vascular technology, or in an accredited vascular laboratory. Confirm your own LCD before assigning the task, and document the competency of whoever performs it.
Does an ABI test have to be billed incident to?
No. Diagnostic tests cannot be billed to Medicare as incident-to services. The diagnostic test benefit is separate and distinct from the incident-to benefit, so the incident-to supervision conditions do not apply. Diagnostic tests must instead be furnished under the level of physician supervision assigned to the code in the Medicare Physician Fee Schedule Database.
Does the physician have to be in the room during an ABI test?
Only if the code carries a personal supervision requirement, which means a physician must be in attendance in the room. Under direct supervision the physician must be present in the office suite and immediately available, but not in the room. Under general supervision the procedure is furnished under the physician’s overall direction and control without requiring the physician’s presence. Look up the supervision indicator for the code you report in the CMS Physician Fee Schedule Look-up Tool, or confirm it with your MAC.
Does staff training affect ABI accuracy?
Substantially. Published data indicate that only about one-third of providers who reported performing the procedure demonstrated correct use, and a randomized controlled trial found experiential learning significantly improved correct performance compared with didactic instruction alone. Technique factors matter: testing a seated rather than supine patient has been documented to raise the ABI by roughly 0.3, and guidelines recommend a rest period of 10 to 30 minutes beforehand. Given a normal range of 1.00 to 1.40, those errors are large enough to change the interpretation.
Consult your healthcare provider before starting any new treatment. This article is written for healthcare professionals and is general information about testing operations, not medical advice for patients.
Disclaimer: This article is for general educational purposes for healthcare professionals and is not billing, coding, legal, or medical advice. CPT® is a registered trademark of the American Medical Association (AMA); all CPT codes and descriptions are © the AMA. Coverage rules, supervision assignments, and local coverage determinations change over time and vary by payer and jurisdiction, so verify every code and policy against the current AMA CPT manual, the applicable Medicare Administrative Contractor policy, and your state’s scope-of-practice law before performing or billing a study. Clinical decisions remain the responsibility of the treating provider.
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