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DESCRIPTIONSurface electromyography, a noninvasive procedure that records the summation of muscle electrical activity, has been investigated as a technique to evaluate the physiological functioning of the back. In addition, this procedure has been studied as a technique to evaluate abnormal patterns of electrical activity in the paraspinal muscles in patients with back pain symptoms such as spasm, tenderness, limited range of motion, or postural disorders.
Identifying the pathogenesis of back pain is a challenging task, in part due to the complex anatomy of the back, which includes vertebrae, intervertebral discs, facet joints, spinal nerve roots, and numerous muscles. For example, back pain may be related to osteoarthritis, disc disease, subluxation, or muscular pathology, such as muscle strain or spasm. In addition, due to referred pain patterns, the location of the pain may be related to pathology in the spine. In addition to the diagnostic challenges of back pain is the natural history of acute back pain. As reported in the guidelines from the Agency for Healthcare Research and Quality (AHRQ, formerly the Agency for Health Care Policy and Research, AHCPR) ) for the management of acute low back pain, the majority of cases of acute low back pain will resolve without specific therapy. A specific workup is not recommended, unless “red flag” warning signs are present or the pain persists for longer than one (1) month. Conservative therapy consists of physical therapy and a continuation of normal activities within the limits permitted by the pain.
Aside from the physical exam, diagnostic tests include imaging technologies, such as magnetic resonance imaging (MRI), designed to identify pathology (e.g., bulging discs), or tests such as discography to localize the abnormality by reproducing the pain syndrome. However, due to their lack of specificity, all diagnostic tests must be carefully interpreted in the context of the clinical picture. For example, 5% of asymptomatic patients will have bulging discs as identified by MRI. Therefore, the presence of a bulging disc may only be clinically significant if well correlated with symptoms. Assessment of the musculature may focus on range of motion or strength exercises.
In contrast to anatomic imaging, surface electromyography (SEMG), which records the summation of muscle activity from groups of muscles, has been investigated as a technique to evaluate the physiological functioning of the back. SEMG, a noninvasive procedure, is contrasted with needle electromyography, an invasive procedure, in which the electrical activity of individual muscles is recorded.
Paraspinal SEMG, also referred to as paraspinal EMG scanning has been explored as a technique to evaluate abnormal patterns of electrical activity in the paraspinal muscles in patients with back pain symptoms such as spasm, tenderness, limited range of motion, or postural disorders. The technique is performed using one (1) or an array of electrodes placed on the skin surface, with recordings made at rest, in various positions, or after a series of exercises. Recordings can also be made by using a handheld device which is applied to the skin at different sites. Electrical activity can be assessed by computer analysis of the frequency spectrum (i.e., spectral analysis), amplitude, or root mean square of the electrical action potentials. In particular, spectral analysis focusing on the median frequency has been used to assess paraspinal muscle fatigue during isometric endurance exercises. Paraspinal SEMG has been researched as a technique to establish the etiology of back pain and also has been used to monitor the response to therapy and establish physical activity limits, such as assessing capacity to lift heavy objects or ability to return to work.
Paraspinal SEMG is an office-based procedure that may be most commonly used by physiatrists or chiropractors. SEMG devices approved by the U.S. Food and Drug Administration (FDA) include those that use a single electrode or a fixed array of multiple surface electrodes. The following clinical applications of the paraspinal SEMG have been proposed:
See Electromyography (EMG) policy
POLICYParaspinal surface electromyography (SEMG) is considered investigational as a technique to diagnose or monitor back pain.
POLICY EXCEPTIONSFederal Employee Program (FEP) may dictate that all FDA-approved devices, drugs or biologics may not be considered investigational and thus these devices may be assessed only on the basis of their medical necessity.
POLICY GUIDELINESInvestigative service is defined as the use of any treatment procedure, facility, equipment, drug, device, or supply not yet recognized by certifying boards and/or approving or licensing agencies or published peer review criteria as standard, effective medical practice for the treatment of the condition being treated and as such therefore is not considered medically necessary.
The coverage guidelines outlined in the Medical Policy Manual should not be used in lieu of the Member's specific benefit plan language.
POLICY HISTORY7/1993: Approved by Medical Policy Advisory Committee (MPAC)
8/1997: Reviewed by MPAC
6/22/2001: Managed Care Requirements deleted, EMG hyperlink inserted, table added to Code Reference section
2/13/2002: Investigational definition added
5/8/2002: Type of Service and Place of Service deleted
5/23/2002: Code Reference section completed, CPT code 96002 added, HCPCS S3900 added
6/23/2004: Policy reviewed
8/15/2005: Code Reference section updated, CPT code 96003 added
4/18/2006: Policy updated
2/14/2008: Policy reviewed, no changes
04/16/2010: "To Evaluate and Monitor Back Pain" added to the policy title. Policy description updated. The verbiage “and is not eligible for coverage” deleted from the policy statement; intent unchanged. FEP verbiage added to the Policy Exceptions section. Deleted outdated references from Sources section.
12/28/2010: Policy reviewed; no changes.
01/17/2012: Policy reviewed; no changes.
03/13/2013: Policy reviewed; no changes.
10/25/2013: Policy reviewed; no changes.
SOURCE(S)Blue Cross Blue Shield Association policy # 2.01.03
Blue Cross Blue Shield Association policy # 2.01.35
CODE REFERENCEThis may not not be a comprehensive list of procedure codes applicable to this policy.