Diagnostic Imaging Denial Guide

How to Appeal an MRI, CT, or PET Scan Denial: Clinical Guide

Insurers and their utilization review vendors often deny high-cost diagnostic scans by comparing your records against fixed medical policy criteria. These steps show how to challenge a medical necessity denial for your scan.

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Denial Details

Imaging denial dispute parameters

High-tech diagnostic imaging denials usually involve a carrier or delegated utilization management vendor comparing your records against rigid medical policy criteria.

Claim Category

High-Tech Diagnostic Imaging Denial

Common Denial Codes

CO-50 (Medical Necessity), CO-197 (Precertification/Authorization Absent)

Common Managing Vendors

eviCore healthcare, Carelon Medical Benefits Management, AIM Specialty Health

Timing Anchors

Urgent review target: 30 days. ERISA appeal window: 180 days.

Appeal Workflow

How the appeal process works

To appeal an adverse imaging determination, specific administrative and clinical actions must be completed. Work through them in order.

Step 1: Identify the Review Organization

Triage Sequence

What to do

You must determine whether the denial came directly from your carrier or from a delegated utilization management vendor such as eviCore or Carelon. You must record the authorization tracking number, denial reason, reviewer name if provided, and the clinical guideline cited in the notice.

Step 2: Audit the Conservative Therapy Timeline

Triage Sequence

What to do

Imaging guidelines often require documented conservative management before approving an MRI or CT. You must pull dates, session notes, prescription records, and treatment summaries for physical therapy, chiropractic visits, medication trials, or activity modification completed before the scan request.

Step 3: Isolate Clinical Red Flags

Triage Sequence

What to do

You must review physician notes for symptoms that support urgent imaging, including progressive neurological changes, trauma, cancer history, infection concerns, or other documented red flags. These findings can justify imaging without waiting for the usual conservative therapy window.

Step 4: Compile the Appeal and File Directly

Triage Sequence

What to do

You must assemble the denial notice, physician order, office notes, conservative therapy records, imaging request details, HIPAA authorization, and carrier-specific representative forms into one complete packet. You must submit it to the carrier or delegated imaging review department through the designated appeal channel.

Utilization Review Regulations

Ask for the criteria behind the denial

Under both federal ERISA standards and state insurance mandates (such as California Health and Safety Code § 1367.01 or New York Insurance Law § 4903), any denial based on medical necessity must be reviewed and signed by a licensed clinical peer. You maintain the statutory right to request the specific clinical criteria used to issue the denial and the credentials of the reviewing physician.

Next Step

Have an imaging denial?

Answer a few questions about your denial and get an editable appeal letter you can review and send yourself.

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