**Notice:** It is not appropriate to bill Medicare for services that are not
covered (as described by this entire LCD) as if they are covered. When billing
for non-covered services, use the appropriate modifier.  
  
Compliance with the provisions in this policy may be monitored and addressed
through post payment data analysis and subsequent medical review audits.  
  
 **History/Background and/or General Information**  
  
Non-invasive tests for cerebrovascular arterial function document the nature,
location, extent and severity of disease in extracranial and intracranial
vessels, including the carotid and vertebral arteries. "Vascular studies
include patient care required to perform the studies, supervision of the
studies and interpretation of study results with copies for patient records of
hard copy output with analysis of all data, including bidirectional vascular
flow or imaging when provided." (AMA 2018 CPT book, page 654). A hard copy or
a soft copy convertible to a hard copy provides a permanent record of the
study performed and must be of a quality that meets accepted
radiologic/ultrasonographic standards.  
  
Any vascular studies performed should be as a result of, or to complement, a
thorough patient evaluation and neurological examination.

For information on noninvasive tests of carotid function, please see CMS IOM
Publication 100-03, _Medicare National Coverage Determinations (NCD) Manual_ ,
Chapter 1 Part 1, Section 20.17.

There are numerous tests that measure various aspects of vascular anatomy and
physiology as follows:

Direct tests:

Carotid Phonoangiography  
Direct Bruit Analysis  
Spectral Bruit Analysis  
Doppler Flow Velocity  
Ultrasound imaging including Real Time  
B-scan and Doppler Devices

Indirect tests:

Periorbital Directional Doppler Ultrasonography  
Oculoplethysmography  
Ophthalmodynamometry

Extracranial cerebrovascular testing uses duplex ultrasonography as the
primary testing technique. Protocols must encompass both real-time gray scale
imaging (B-mode) and analysis of the angle corrected Doppler spectrum.  
  
 **Duplex Scan**  
  
This procedure combines high-resolution B-mode real-time imaging with Doppler
ultrasound and spectral analysis. The scan provides anatomic and hemodynamic
characterization of the cervical carotid and vertebral arteries as well as
characterization of the atheromatous plaque. Color-flow Doppler is used to
enhance conventional data acquisition.  
  
 **Transcranial Doppler**  
  
Pulsed Doppler ultrasound is used to interrogate the intracranial vasculature
of the Circle of Willis. Its value has been established in detecting severe
stenoses in the major intracranial arteries, assessing patterns and extent of
collateral circulation in patients with known regions of severe stenosis or
occlusion, and evaluating and following patients with vasoconstriction
particularly after subarachnoid hemorrhage.  
  
For coding guidelines, please refer to Article A52992, Billing and Coding:
Non-Invasive Cerebrovascular Arterial Studies.  
  
**Covered Indications**  
  
1\. The following are covered indications for Duplex scans, Doppler Ultrasound
with Spectrum Analysis, Ocular Pneumoplethysmography, and Periorbital Doppler:

  * Evaluation of patients with a cervical bruit
  * Evaluation of pulsatile neck masses
  * Evaluation of patients with hemispheric neurologic symptoms, including stroke, transient ischemic attack and amaurosis fugax
  * Follow-up of patients with proven carotid disease who are receiving medical therapy
  * Follow-up for postoperative patients following carotid endarterectomy, stenting or carotid to subclavian bypass
  * Evaluation of suspected subclavian steal syndrome
  * Evaluation of retinal arterial emboli
  * Evaluation of suspected carotid artery dissection or pseudoaneurysm
  * Evaluation of sudden and lateralizing neurologic deficit
  * Established or symptomatic coronary artery disease or cardiac valvular disease
  * "Drop attacks" or syncope when there are documented signs or symptoms consistent with vertebral basilar or carotid artery disease or insufficiency

2\. The following are covered indications for Transcranial Doppler (TCD):

  * Detection and follow up of severe stenosis in the major basal intracranial arteries
  * Assessment of patterns and extent of collateral circulation in patients with known regions of severe cerebral stenosis or occlusion
  * Intraoperative and perioperative monitoring of intracranial flow velocity and hemodynamic patterns during carotid endarterectomy
  * Detection and monitoring of vasospasm in patients with spontaneous or traumatic subarachnoid hemorrhage
  * Detection and follow up of cerebral arteriovenous malformations
  * Confirmation of the clinical diagnosis of brain death
  * Evaluation of invasive therapeutic interventions for cerebral malformations
  * Evaluation of cerebral embolization
  * "Drop attacks" or syncope when there are documented signs or symptoms consistent with vertebral basilar or carotid artery disease or insufficiency

**Limitations**  
  
1\. Non-invasive vascular studies done for screening purposes (i.e., without
signs or symptoms of disease) are considered not reasonable and necessary and
are therefore non-covered by Medicare. Examples of screening studies include
but are not limited to:

  * Extracranial arterial studies performed as part of a cardiovascular preoperative workup in the absence of signs or symptoms of disease are screening services and as such are non-covered by Medicare.
  * Subclavian ultrasound studies routinely performed in conjunction with carotid ultrasounds in the absence of signs or symptoms of disease are screening services and as such are non-covered by Medicare.

2\. Non-invasive vascular studies are considered not reasonable and necessary
if the results are not needed for clinical decision making. If the study
results will have no impact on the decision for further diagnostic or
therapeutic procedures or will not provide any unique diagnostic information
that would impact patient management, then the non-invasive studies are not
reasonable and necessary. For example, if it is evident from the findings of
the history and physical examination that the patient is going to proceed to
angiography, then non-invasive vascular studies are not reasonable and
necessary.  
  
3\. Transcranial cerebral vascular studies including but not limited to the
following conditions are not covered:

  * Evaluation of brain tumors
  * Assessment of familial and degenerative diseases of the cerebrum, brainstem, cerebellum, basal ganglia and motor neurons
  * Evaluation of infectious and inflammatory conditions
  * Evaluation of psychiatric disorders
  * Epilepsy
  * Assessing patients with migraine or headache
  * Monitoring during cardiopulmonary bypass and other cerebrovascular and cardiovascular interventions, and other surgical procedures
  * Evaluation of patients with dilated vasculopathies such as fusiform aneurysms
  * Assessing autoregulation, physiologic, and pharmacological responses of cerebral arteries
  * Evaluating various vasculopathies such as sickle cell disease, moya moya disease, and neurofibromatosis

4\. Please see coverage information in CMS IOM 100-03, _Medicare National
Coverage Determinations (NCD) Manual,_ Chapter 1, Section 20.14 for
Plethysmography, Section 20.17 for Oculoplethysmography and Chapter 1 Part 4,
Section 220.11 for Thermography. In addition to the limitations outlined in
the above NCD references, the following methods are not acceptable for
reimbursement of Duplex scans of the extracranial arteries or Transcranial
Doppler studies of the intracranial arteries:

  * Light reflection rheography
  * Pulse Delay Oculoplethysmography
  * Carotid Phonoangiography and other forms of bruit analysis are included in the reimbursement for the office visit
  * Periorbital Photoplethysmography

5\. The following limitations apply to multiple non-invasive studies performed
during the same encounter:

  * Performance of both non-invasive extracranial arterial studies and non-invasive evaluation of extremity veins during the same encounter is rarely medically necessary. Documentation must clearly support the medical necessity if both procedures are performed during the same encounter and be made available upon request.
  * Because signs and symptoms of arterial occlusive disease and venous disease are so divergent, the performance of simultaneous arterial and venous studies during the same encounter is rarely medically necessary. Consequently, documentation must clearly support the medical necessity of both procedures if performed during the same encounter and be made available upon request.

6\. "The use of a simple hand-held or other Doppler device that does not
produce hard copy output, or that produces a record that does not permit
analysis of bidirectional vascular flow, is considered to be part of the
physical examination of the vascular system and is not separately reported."
(AMA 2018 CPT book, page 654) Doppler procedures performed with zero-crossers
(i.e., analog [strip chart recorder] analysis) are also included in any
Evaluation/Management (E/M) service. Therefore, it is considered not
reasonable and necessary to report these procedures as separate services.  
  
**Training Requirements/Certifications**  
  
The accuracy of non-invasive diagnostic testing studies depends on the
knowledge, skill and experience of the physician and/or technologist
performing and interpreting the study. Documentation of applicable training
and experience must be maintained and made available upon request. Services
will be considered reasonable and necessary only if performed by appropriately
trained personnel. Please see CMS IOM Publication 100-02, _Medicare Benefit
Policy Manual_ , Chapter 15, Section 80 for information regarding supervision
definitions and requirements.  
  
All non-invasive vascular studies must be:  
  
1\. Performed by a qualified physician; or  
  
2\. Performed under the general supervision of a qualified physician by a
licensed* technologist who is certified in vascular technology; or  
  
3\. Performed in an accredited vascular laboratory.  
  
*State licensure for a technologist is required in addition to appropriate recognized certification. Documentation of current, active licensure must be maintained and made available upon request. In the absence of a state/federal district licensing board, the requirement for licensure is waived.  
  
A **qualified physician** for this service/procedure is defined as:  
  
A) Physician is properly enrolled in Medicare; and  
  
B) Training and expertise must have been acquired within the framework of an
accredited residency and/or fellowship program in the applicable
specialty/subspecialty in the United States or must reflect equivalent
education, training, and expertise endorsed by an academic institution in the
United States and/or by the applicable specialty/subspecialty society in the
United States.  
  
Appropriate technologist certification is limited to American Registry of
Diagnostic Medical Sonographers (ARDMS) certification as a Registered Vascular
Technologist (RVT), Cardiovascular Credentialing International (CCI)
certification as a Registered Vascular Specialist (RVS), and the American
Registry of Radiologic Technologists (ARRT) certification in Vascular
Sonography (VS). Appropriate laboratory accreditation is limited to the
American College of Radiology (ACR) Vascular Ultrasound Program, and the
Intersocietal Accreditation Commission (IAC) division of Vascular Testing.  
  
The contractor does not establish a credentialing service but the contractor
is authorized to determine which organizations it recognizes. For example, the
use of the word "national" in the organization's name does not, in itself,
meet Medicare standards for national credentialing.  
  
Note: For services performed in an Independent Diagnostic Testing Facility
(IDTF), please refer to Local Coverage Determination (LCD) L35448, Independent
Diagnostic Testing Facility (IDTF), and related Local Coverage Article A53252,
Independent Diagnostic Testing Facility (IDTF), for additional information.  
  
This LCD imposes frequency limitations. Please refer to the Utilization
Guidelines section below for information regarding limitations.  
  
 **Notice:** Services performed for any given diagnosis must meet all of the
indications and limitations stated in this policy, the general requirements
for medical necessity as stated in CMS payment policy manuals, any and all
existing CMS national coverage determinations, and all Medicare payment rules.
Please refer to Billing and Coding: Non-Invasive Cerebrovascular Arterial
Studies, A52992, for appropriate CPT and ICD-10 codes.  
  
Please see CMS IOM 100-08, Chapter 13, Section 13.5.4, for information
pertaining to reasonable and necessary provisions in LCDs.  
  
The redetermination process may be utilized for consideration of services
performed outside of the reasonable and necessary requirements in this LCD.