Cigna MRI or CT Scan Denied? Prior Authorization Appeal Guide

A Cigna denial for MRI or CT imaging is one of the most common Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization disputes — and one where the right knowledge about how Cigna's radiology review process actually works makes an enormous difference. If your imaging was denied as "not medically necessary" or rejected for lack of prior authorization, this guide explains exactly what happened, who made the decision, and how to reverse it.

Who Actually Denied Your Imaging: eviCore

When Cigna denies a prior authorization for MRI, CT scan, PET scan, or other advanced imaging, the denial was almost certainly made by eviCore Healthcare, not by Cigna's own medical staff. Cigna contracts eviCore to manage radiology prior authorization decisions for a large portion of its commercial book of business.

eviCore uses its own proprietary clinical guidelines — the eviCore Musculoskeletal (MSK) Imaging Guidelines, eviCore Neurology Imaging Guidelines, eviCore Oncology Guidelines, etc. — to evaluate imaging PA requests. These guidelines are distinct from Cigna's Clinical Policy Bulletins (CPBs) and are updated periodically. You can request the specific eviCore guideline applied to your case.

Because eviCore made the clinical decision, your most effective next step is not a formal Cigna appeal — it is a direct peer-to-peer review call with an eviCore physician. This call is separate from and faster than Cigna's internal appeal process, and it resolves a significant percentage of radiology PA denials before they ever become formal appeals.

ACR Appropriateness Criteria: The Gold Standard for Imaging

The American College of Radiology (ACR) Appropriateness Criteria are the nationally recognized clinical decision support guidelines for appropriate imaging utilization. ACR Appropriateness Criteria provide evidence-based recommendations for specific imaging modalities based on clinical scenario — for example, they specify when MRI is appropriate versus CT, or when imaging is appropriate versus watchful waiting.

eviCore's own guidelines incorporate ACR Appropriateness Criteria as a reference standard. When your ordering physician cites the specific ACR Appropriateness Criteria that supports the imaging — and the patient's clinical presentation matches the ACR clinical scenario — this is extremely persuasive in both peer-to-peer review and formal appeal.

For example:

• Low back pain MRI: ACR Appropriateness Criteria support MRI without contrast for acute low back pain with red flag symptoms (radiculopathy, neurological deficits, prior cancer history, suspected cauda equina syndrome). For uncomplicated low back pain without red flags, ACR typically recommends conservative treatment for 4–6 weeks before imaging — which is also what eviCore's guidelines require.
• Knee MRI: ACR supports MRI for evaluation of internal derangement when physical exam findings suggest ligamentous injury, meniscal tear, or osteochondral defect.
• Brain MRI: ACR supports MRI for headache with atypical features, new neurological symptoms, or headache unresponsive to treatment.

Your ordering physician should identify the specific ACR clinical scenario that matches your presentation and cite it explicitly in the PA request and in any appeal.

How Peer-to-Peer Review Works with eviCore

The eviCore peer-to-peer review process works as follows:

1. Your ordering physician (or their office staff) calls the eviCore peer-to-peer line — the number is typically included in the PA denial notice
2. The physician is connected with an eviCore physician reviewer with relevant specialty background
3. The reviewing physician explains the specific eviCore guideline criteria that were not met
4. Your physician presents the clinical information that supports the imaging — symptoms, physical exam findings, lab results, prior conservative treatment trials
5. If the reviewing physician is persuaded, they can authorize the imaging immediately on the call

The peer-to-peer call should be requested within 24–48 hours of receiving the denial. Most insurers and utilization management companies have a 14-day window for peer-to-peer review before the case goes to formal appeal.

Physician preparation for the peer-to-peer call is critical. The physician should be ready to describe: the specific clinical presentation and duration of symptoms, physical exam findings that indicate imaging, what conservative treatment has already been tried, and specifically why the imaging requested is necessary for diagnosis and treatment planning.

Expedited Review for Urgent Imaging

When imaging is clinically urgent — suspected cancer, acute neurological symptoms, suspected vascular injury — the standard PA timeline is inadequate. Request expedited prior authorization review, which requires Cigna/eviCore to respond within 72 hours.

For truly emergent imaging needs — acute stroke workup, suspected aortic dissection, trauma — do not wait for PA. Emergency imaging is covered by your plan and protected under the No Surprises Act if performed in an emergency setting. Obtain the imaging and then appeal the reimbursement if a denial follows.

If expedited PA is denied, immediately request expedited internal appeal through Cigna at 1-800-CIGNA-24. Provide your physician's written certification that delay would jeopardize your health.

Building Your Formal Appeal

If the peer-to-peer review does not resolve the denial, file a formal internal appeal. Your appeal package should include:

• The specific ACR Appropriateness Criteria relevant to your clinical scenario (available at acr.org/Clinical-Resources/ACR-Appropriateness-Criteria)
• Your physician's detailed letter documenting the clinical presentation, relevant symptoms, duration, physical exam findings, and prior treatments
• Any relevant prior study results, lab results, or consultant notes that support the clinical indication
• The specific eviCore guideline criteria applied to the denial and a point-by-point response demonstrating how the clinical presentation meets those criteria

If the imaging was already performed and you are appealing for post-service reimbursement, include the imaging report itself — the findings may provide additional support for why the imaging was appropriate.

Fight Back With ClaimBack

Cigna MRI and CT scan denials through eviCore are frequently reversed in peer-to-peer review and formal appeal when ACR Appropriateness Criteria are properly applied. ClaimBack helps your physician prepare for peer-to-peer review and builds a complete formal appeal package. Start at https://claimback.app/appeal.

Related Reading

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Common Reasons Insurance Claims Are Denied