Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) of the Spine
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Clinical coverage criteria and coding for MRI and CT of the spine describing when these imaging studies are medically necessary, investigational, or not indicated for Aetna members.
No material clinical or coverage changes in this revision.
Coverage Criteria and Clinical Indications
inv-01: Medically Necessary Indications
Covered when ANY of the following are met:
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inv-02: Experimental / Investigational / Not Medically Necessary
Not covered / experimental when any of the following apply:
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inv-03: Evidence-based coverage considerations
Covered when supported by clinical indication and evidence-based guidance:
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inv-04: General indications
Imaging is supported when clinical presentation or prior imaging suggests serious pathology or when advanced imaging will change management.
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inv-05: Limited utility / caution
Situations where MRI/CT may be unnecessary or limited utility:
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Routine MRI after a normal cervical spine CT in obtunded or comatose individuals is considered experimental and investigational and is not supported as standard practice. The policy cites literature showing that high-quality cervical spine CT has a very high negative predictive value for clinically significant unstable injury in obtunded blunt trauma patients, and routine MRI following a negative CT rarely identifies injuries that change management. Documentation of the negative CT and clinical status should guide decisions about additional imaging rather than automatic MRI.
Imaging (CT, MRI, or radiography) is not recommended for patients with non-specific low-back pain without red flags, consistent with the ICSI (2012) guideline and ACP/AAFP recommendations. Evidence from randomized trials and systematic reviews shows that routine imaging in this population does not improve pain or functional outcomes and increases costs; obtain advanced imaging only when history, exam, or plain radiographs suggest serious pathology or when symptoms persist or progress despite appropriate conservative care.
Routine MRI is not indicated for patients with mild acute or chronic neck pain in the absence of red flags or functional impact. UpToDate and guideline statements recommend reserving MRI for patients with findings suggestive of infection, malignancy, spinal cord compression, or persistent moderate-to-severe symptoms (>6 weeks) that affect daily activities; when radiographs are normal or show only degenerative change, MRI is generally unnecessary.
Imaging of chronic mechanical low back pain or non-specific low back pain without radiculopathy, neurologic deficit, trauma, or suspicion of systemic disease is not routinely indicated. Guidelines and trials indicate that immediate or routine advanced imaging in these patients does not improve clinical outcomes; reserve MRI or CT for patients with red flags, progressive or severe symptoms, or when results would change management after a trial of conservative therapy.
The evidence does not generally support routine MRI after a normal cervical spine CT in either obtunded or neurologically intact blunt trauma patients. Meta-analyses and cohort studies report very low incidence of unstable injuries missed by high-quality CT and show that MRI commonly detects additional ligamentous findings of minor clinical significance that infrequently alter management; therefore, routine MRI following a negative CT is usually not necessary and should be considered only for specific clinical concerns.
For low-velocity neck trauma (eg, whiplash) MRI is generally not required in the absence of red flags. The guidance states MRI should be obtained urgently only if infection, malignancy, or spinal cord compression is suspected; otherwise initial evaluation may proceed with clinical assessment and plain radiography, and MRI is reserved for persistent or progressive symptoms or focal neurologic findings. MRI is also not routinely necessary solely to discontinue cervical spine precautions after a negative multi-detector CT unless specific clinical concerns exist.
Specific Covered Indications
inv-49: Trauma — CT preferred for suspected fracture/dislocation when plain films inconclusive; MRI may be used for cord/soft tissue evaluation.
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inv-50: Spinal stenosis — MRI preferred but CT is equally appropriate in some cases
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inv-51: Follow-up imaging for lumbar disk herniation / sciatica
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inv-52: Cervical spine clearance in blunt trauma — criteria and recommended imaging pathway
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inv-53: Suspected dynamic cervical cord compression / cervical spondylotic myelopathy
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inv-54: Evaluation of whiplash-associated disorder or non-specific neck pain
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inv-55: Whiplash-associated disorder and non-specific neck pain — additional related node
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inv-56: Posture-dependent spine pathology evaluation — indications for upright/positional imaging modalities
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inv-57: Suspected spondylodiscitis/vertebral osteomyelitis — indications for MRI with/without contrast and CT as adjunct
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inv-58: Acute vertebral fractures (DE-CT adjunct) — indications where dual-energy CT may be used adjunctively
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inv-59: Evaluation of spinal stenosis and causes including epidural lipomatosis
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inv-60: Evaluation of acute vertebral fractures to detect bone marrow edema and fracture lines
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Coding — CPT, HCPCS, ICD-10 and Related
| 72125 | Computed tomography, cervical spine; without contrast material. |
| 72126 | with contrast material. |
| 72127 | without contrast material, followed by contrast material(s) and further sections. |
| 72128 | Computed tomography, thoracic spine; without contrast material. |
| 72129 | with contrast material. |
| 72130 | without contrast material, followed by contrast material(s) and further sections. |
| 72131 | Computed tomography, lumbar spine; without contrast material. |
| 72132 | with contrast material. |
| 72133 | without contrast material, followed by contrast material(s) and further sections. |
| 72141 | Magnetic resonance (e.g., proton) imaging, spinal canal and contents, cervical; without contrast material. |
| A9575 | Injection, gadoterate meglumine, 0.1 ml. |
| A9576 | Injection, gadoteridol (ProHance multipack), per ml. |
| A9577 | Injection, gadobenate dimeglumine (MultiHance), per ml. |
| A9578 | Injection, gadobenate dimeglumine (MultiHance multipack), per ml. |
| A9579 | Injection, gadolinium based magnetic resonance contrast agent, not otherwise specified, per ml. |
| Q9953 | Injection, iron-based magnetic resonance contrast agent, per ml. |
| Q9954 | Oral magnetic resonance contrast agent, per 100 ml. |
| C41.2 | Malignant neoplasm of vertebral column. |
| G35 | Multiple sclerosis. |
| G83.4 | Cauda equina syndrome. |
| M48.00 - M48.09 | Spinal stenosis. |
| D17.79 | Benign lipomatous neoplasm of other sites (for evaluation of lumbar epidural lipomatosis). |
| R40.20 - R40.244 | Coma (not covered for use of routine MRI after a normal CT of the cervical spine). |
| Dual-energy CT | No specific CPT code; considered experimental and investigational for evaluation of bone marrow edema and fracture lines in acute vertebral fractures. |
| not provided | CT-guided percutaneous spine biopsy (documented but specific CPTs not included in this excerpt). |
| not provided | Dual-energy CT for evaluation of bone marrow edema and fracture lines (specific CT codes not listed). |
Provider Responsibilities and Administrative Actions
Policy Bulletin Purpose
Clinical Policy Bulletins are developed by Aetna to assist in administering plan benefits and to provide guidance on appropriate use of services. They are intended as a tool for plan administration and not as a substitute for clinical judgment.
- Clinical Policy Bulletins are developed to assist in administering plan benefits and do not constitute offers of coverage or medical advice.
- This Clinical Policy Bulletin contains only a partial, general description of plan or program benefits and does not constitute a contract.
Provider Responsibility
Providers and treating clinicians remain solely responsible for medical advice, diagnosis, and treatment decisions for their patients. The bulletin is informational and does not replace individualized clinical judgment.
- Treating providers are solely responsible for medical advice and treatment of members.
- Participating providers are independent contractors and are neither employees nor agents of Aetna or its affiliates.
Scope and Contractual Notice
The bulletin is a general description of plan benefits and administrative rules; coverage determinations depend on the member's specific plan provisions. Providers should consult plan-specific administrative guidance and prior authorization rules where applicable.
- This bulletin is a partial, general description of plan or program benefits and does not constitute a contract.
- Coverage determinations are subject to plan benefits, limitations, exclusions, and prior authorization requirements.
Gadolinium and Contrast Use Guidance
Contrast rule — MRI with/without gadolinium preferred for postoperative recurrent symptoms
For postoperative recurrent symptoms and evaluation of certain lesions, MRI with and without gadolinium enhancement is the preferred modality and may be required to answer the clinical question.
- Order MRI with contrast when assessing postoperative recurrent symptoms if clinically indicated.
Contrast rule — consider gadolinium for infection, tumor, or epidural fibrosis
When infection, tumor, or post‑surgical epidural fibrosis is suspected, addition of gadolinium contrast to MRI can improve diagnosis and may be ordered if non‑contrast MRI is inconclusive.
- Document the clinical concern for infection or tumor when ordering contrast‑enhanced MRI.
Contrast rule — cervical spine MRI use when radiographs suspicious or concern for infection/malignancy
If radiographs show suspicious findings or there is clinical concern for infection or malignancy, perform cervical spine MRI (without contrast initially) when radiographs are normal but clinical concern remains; use contrast as clinically indicated for infection or tumor evaluation.
- If radiographs are abnormal, escalate to MRI and specify whether contrast is needed based on suspected diagnosis.
Contrast rule — use gadolinium‑enhanced MRI per referenced guidance
Gadolinium‑enhanced MRI is referenced for postoperative lumbar spine assessment and other specific indications; consult the policy’s referenced guidance when deciding on contrast use.
- Follow referenced guidance for specific postoperative and diagnostic scenarios requiring contrast.
Services Considered Not Covered / Experimental
Dual-energy CT (DE-CT) for evaluation of bone marrow edema and fracture lines in acute vertebral fractures is considered experimental and investigational and is not covered. The policy notes that DE-CT techniques have been studied as adjuncts to conventional imaging, but DE-CT for this indication lacks established, plan-covered coding and is designated investigational in this policy.
Routine MRI after a normal cervical spine CT in obtunded or comatose individuals is listed as not covered because it is considered experimental and investigational for that use. The policy explicitly references the ICD-10 coma codes in the coding section to identify this non-covered intended use and states that no specific CPT code is assigned for routine post-CT MRI in this context.
Routine MRI after a normal cervical spine CT in obtunded or neurologically intact blunt trauma patients when there is no clinical indication for further imaging is not covered as a routine practice. Decision analyses and cohort studies cited in the policy indicate that no-follow-up after a negative CT is generally the more cost‑effective and clinically appropriate strategy unless specific neurologic signs, abnormal CT findings, or other clinical concerns justify additional MRI.
Routine MRI for mild neck pain without red flags or functional impairment is considered not covered as it is generally unnecessary. Guideline-based recommendations emphasize that in the absence of red flags or significant functional limitation, imaging does not improve outcomes and should be avoided; obtain MRI only when clinical evaluation or initial radiographs warrant further assessment.
Background and Definitions
Magnetic resonance imaging is the preferred imaging modality for most medically necessary spine indications described in this policy: it is the test of choice for spinal stenosis, myelopathy, recurrent postoperative symptoms (with and without gadolinium as indicated), infection, tumor evaluation, and most soft-tissue or cord assessments. Computed tomography is preferred when osseous detail is required such as suspected fracture or dislocation after inconclusive plain radiographs, and CT and MRI are considered equally appropriate for some presentations of spinal stenosis.
Policy Dates and Revision History
Policy became effective.
Policy last reviewed.
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