How do I appeal a denied MRI?

Get the written denial and the imaging policy or guideline version cited. File an appeal that lists conservative care tried with dates, exam findings, and any red flags, then map each element to the plan's stated criteria. Include the order, clinician notes, and the PA reference number.

What should I include in an MRI denial appeal letter?

Include member ID, claim or PA number, diagnosis codes, body region and laterality, conservative-care timeline with dates, exam findings, prior imaging if any, and a direct response to each reason on the denial. A signed clinician letter strengthens the packet.

Can I get an MRI without finishing physical therapy?

Sometimes. If the plan requires a PT trial, you need either completed visits with poor response or documented red flags or contraindications to delay. Ask the ordering clinician to state why further delay is clinically inappropriate.

Who is Carelon or eviCore?

They are utilization-management vendors many insurers hire for imaging PA. Appeal through the vendor portal listed on the denial and, if needed, through the health plan as well.

Does a doctor's order guarantee approval?

No. An order starts PA. Coverage still depends on the plan's imaging policy and network rules.

What if the scan was already done?

Ask about retrospective authorization. Attach the report, the clinical indication at the time of the scan, and proof of why PA could not reasonably be obtained, for example in an ER or inpatient setting.

Is PET the same process as MRI?

PET often uses oncology pathways such as NCCN-aligned plan policies rather than musculoskeletal PT rules. Use cancer staging or restaging notes, not a generic back-pain template.

How fast is an expedited imaging appeal?

Urgent UM decisions are often due within 72 hours when delay could seriously jeopardize health, but the exact clock is on your notice and in plan documents. Request expedited review in writing.

100% FreeImaging / PANo login requiredAbout 3 minutes

MRI and imaging denial appeal generator

Appeal a denied MRI, CT, or PET with imaging-specific medical necessity wording.

A denied MRI appeal usually responds to prior authorization, conservative-care, or medical-necessity reasons listed on your EOB or PA letter. Request the InterQual, MCG, or plan imaging policy version used, then submit records showing symptom duration, failed treatments, and any neurological or cancer-related red flags. ERISA employer plans often allow up to 180 days for a first internal appeal under 29 CFR 2560.503-1; Medicare Advantage and state-regulated plans may use shorter clocks.

100% free
No login required
Export & print

Loading generator…

Complete guide

How to appeal a denied MRI, CT, or PET scan

Use the MRI denial appeal generator above to draft a letter that answers the vendor's stated criteria, then attach PT and exam notes.

How this tool works

You enter denial facts from your EOB or denial letter — member ID, claim number, service, and the reason the payer gave.
AppealFlow drafts structured appeal language you can edit in the browser. Optional checkboxes add ERISA full-and-fair-review language, No Surprises Act references, or expedited-review requests when they fit your facts.
Export PDF or Word, keep a copy for your records, and file through the portal, fax, or mailing address on your notice before the deadline printed there.

Internal appeals ask the plan to reconsider its own adverse benefit determination. You are not debating fairness in general — you are showing why the decision failed the plan's medical policy, authorization rules, or billing edits.

Keep a single timeline document with denial date, appeal submission date, follow-up calls, and any additional information requests. This record supports state department complaints if the carrier misses required response times under 29 CFR 2560.503-1 or state analogs.

When clinical criteria are cited, request the plan medical policy the reviewer used. You may obtain it through member services or a written request. Compare each criterion to your chart note rather than quoting internet summaries.

Who this is for

Patients denied lumbar, brain, joint, or oncologic MRI/CT/PET
Clinics needing a structured medical-necessity letter for imaging prior auth
People whose radiology benefit manager such as Carelon or eviCore denied authorization
Members appealing after a scan was done without upfront approval

Not a radiology order and not a promise of authorization
Medicare LCDs and commercial UM vendors use different criteria

Step-by-step workflow

Step 1: Confirm whether this is PA, medical necessity, or coding
A missing PA is a process problem that may need retro auth or an appeal. A medical-necessity denial needs clinical criteria. A wrong CPT/ICD pairing needs a corrected claim or physician addendum. Read the denial reason before drafting.
Step 2: Request the criteria actually applied
Plans and vendors such as Carelon/AIM, eviCore, and Magellan publish or will produce the guideline version used. You cannot rebut a black box. Ask for the policy section number cited on the denial.
Step 3: Build a conservative-care timeline
List PT dates, NSAIDs, injections, activity limits, and outcomes. If the plan wants 4–6 weeks, show the calendar or explain why waiting is unsafe based on exam findings.
Step 4: Document red flags when they exist
Progressive weakness, bowel/bladder change, saddle anesthesia, fever with back pain, cancer history with new neuro findings, or major trauma can justify earlier MRI under many appropriateness frameworks. Have the ordering clinician document these in the appeal.
Step 5: Cite ACR Appropriateness Criteria as support, not a mandate
ACR topic ratings can show why a given modality is reasonable for the diagnosis. They advise clinicians; payers apply their own policies. Quote the relevant ACR topic and match it to the plan's stated criteria.
Step 6: File and request peer-to-peer
Submit the appeal with the order, notes, and imaging history. Ask for a physician-to-physician review under the plan's UM process and, for ERISA plans, a full and fair review under 29 CFR 2560.503-1. Keep portal or fax confirmations.

Worked example: lumbar MRI after conservative care

CO-50 denial for CPT 72148 on March 20, 2026. PT notes from January–March document persistent radiculopathy; X-ray report attached. Letter cites ACR Appropriateness Criteria for advanced imaging after failed conservative therapy and requests peer review with a radiology-trained reviewer.

Appeal deadlines by plan type (reference)

Deadlines are plan-specific. The table summarizes common federal frameworks cited on many notices. Your adverse benefit determination letter controls filing dates and channels.

Plan type	Internal appeal	External review	Urgent / expedited
ACA marketplace / fully insured individual & small group	Often 60–180 days from the adverse determination (check notice). ACA internal claims and appeals rules require written notice of rights.	After exhausting internal appeals, many enrollees may request external review; federal rules set minimum external review rights for qualifying plans (see 45 CFR 147.136).	Urgent medical situations may qualify for expedited review; many plans must respond within 72 hours when delay could seriously jeopardize health (45 CFR 147.136(b)(3) framework).
Self-funded employer plan (ERISA)	29 CFR 2560.503-1 requires a reasonable opportunity for a full and fair review; many plans allow about 180 days to request review of an adverse benefit determination unless the plan document grants longer.	External review rights depend on plan design and state law for insured portions; many ERISA plans use independent review vendors after internal exhaustion.	Expedited review must be available when the timeframe for a standard review could seriously jeopardize life or health (29 CFR 2560.503-1(h)(3)(i)).
Original Medicare (Part A & B)	Medicare uses redetermination (Level 1) by the Medicare Administrative Contractor — typically 120 days from the date of the initial determination on the MSN.	Reconsideration (Level 2), ALJ hearing, and further levels follow CMS Medicare appeals guidance — not the same clocks as commercial insurance.	Expedited Medicare determinations exist for certain hospital and SNF situations; follow instructions on the MSN.
Medicare Advantage (Part C)	Organization determination and plan-level appeals follow CMS Medicare Advantage rules; use the plan's forms and clocks on the denial.	After plan-level appeals, enrollees may request CMS review or, for some issues, state external review when applicable.	Part C plans must offer expedited reviews for urgent requests per CMS marketing/appeals requirements.
Medicare Part D (prescription drugs)	Coverage determinations and exceptions use PBM/plan Part D forms; standard determination timeframes are set in CMS Part D regulations.	Appeal to the Independent Review Entity (IRE) after plan-level denial of a standard or expedited determination.	Expedited exceptions and appeals exist when waiting could seriously harm health; request expedited processing in writing.
Medicaid / CHIP (state)	Each state Medicaid agency sets fair hearing and appeal timelines; use the notice from your managed care plan or state agency.	State fair hearing after managed care appeal exhaustion; timelines vary by state and benefit type.	Many states allow expedited hearings when delay would jeopardize health; cite urgency on the request form.

Cite 29 CFR 2560.503-1 for many ERISA group health plans and 45 CFR 147.136 for many non-grandfathered individual/small group plans. Medicare and Medicaid use separate statutes and forms.

Documents to gather

Denial / PA determination with vendor reference number
Ordering clinician notes and exam findings
PT, medication, and injection records
Prior imaging reports if any
Relevant ACR Appropriateness Criteria printout as support
Imaging order with body region, laterality, and CPT code

Commercial appeals often run 180 days; some state-regulated and Medicare Advantage clocks are shorter. Expedited review may apply if delay risks serious harm.

Weak vs strong wording

Weak

My back still hurts after two weeks of rest. I need an MRI now.

Stronger

L5-S1 radiculopathy with new ankle dorsiflexion 4/5 after 6 weeks PT (dates attached). Plan policy requires MRI when motor deficit persists. Request lumbar MRI without contrast per order dated [date].

Motor change plus a completed conservative trial maps to typical UM criteria; pain alone often does not.

Weak

My doctor ordered a brain MRI so insurance should pay.

Stronger

Persistent headaches with new visual field defect and papilledema on exam [date]. Plan imaging policy section [X] allows MRI when red-flag neuro findings are present. Conservative care trial is not clinically appropriate before imaging. Request brain MRI with and without contrast.

Red-flag neurological findings can bypass a PT trial under many imaging policies when documented on exam.

Weak

ACR says I need this scan so you have to approve it.

Stronger

ACR Appropriateness Criteria topic [number] rates MRI as usually appropriate for [diagnosis] after failed conservative care. Member completed 8 weeks PT with no improvement (records attached). Request approval per plan policy [section] which aligns with documented criteria.

Frame ACR as clinical support matched to the plan's own policy, not as a binding order on the payer.

Common mistakes

Appealing MRI of the back without the body region and laterality on the order
Ignoring a separate radiology-benefit vendor such as Carelon or eviCore and mailing only the medical-claims P.O. box
Claiming ACR requires the insurer to approve. ACR advises clinicians; payers apply their own policies.
Submitting a generic pain letter without PT dates, exam findings, or the denial's cited policy section

What to do next

Save proof of filing (portal screenshot, fax confirmation, or certified mail receipt).
If the plan requests more records, respond within the timeframe on the follow-up letter.
When internal appeals are exhausted, read your notice for external review or state complaint rights.
Need deadlines, evidence lists, and filing checklists in one download? Consider the matching AppealFlow pack on the pricing page (document prep only).
Optional paid pack: Medical Necessity Letter Kit (document preparation only).

Authoritative sources

Related tools and guides

FAQs

Generate your denied MRI appeal letter with the tool above, include the PA reference number, and submit before the printed deadline.

Free draft tool · Review with your clinician · Not legal or medical advice · Disclaimer