MRI and PET imaging denials: appeals when prior auth blocks advanced imaging
Advanced imaging denials usually cite missing conservative treatment, low pre-test probability, or appropriate-use criteria. Here is how to satisfy the criteria and win the appeal.
Why MRI and PET get denied
Insurers route most advanced imaging requests through radiology benefit managers (eviCore, Carelon, AIM, Cohere). Denials usually cite the ACR Appropriateness Criteria or NCCN imaging recommendations.
Common reasons: insufficient duration of conservative therapy, no failed first-line imaging (X-ray or ultrasound), or absence of red-flag symptoms.
Source: ACR Appropriateness Criteria. See https://acsearch.acr.org/list.
What wins MRI appeals
Document the duration and modality of conservative care: physical therapy, NSAIDs, activity modification, with dates and outcomes.
Identify red-flag findings on exam (focal neurological deficit, progressive weakness, bowel or bladder dysfunction, fever, night pain, history of cancer).
Cite the specific ACR Appropriateness Criteria topic and rating that supports the requested study.
What wins PET-CT appeals
For oncology indications, cite the relevant NCCN guideline by version and page. Most commercial policies follow NCCN for staging and restaging.
Document the specific clinical question PET will answer that contrast CT or MRI cannot.
For neurology indications (suspected dementia, refractory epilepsy), cite the SNMMI Procedure Standard.
Upload the denial letter. Free analysis first, finished letter second.
FAQ
Can I request a peer-to-peer review?+
Yes. Almost every commercial plan offers peer-to-peer with the radiology benefit manager's medical director. Many imaging denials reverse on the call without a written appeal.
What if I need the MRI urgently?+
Request expedited review. The federal floor is 72 hours when delay would seriously jeopardize life, health, or ability to regain function.
More guides
- How to write a health insurance appeal letter
- Internal appeal vs external review: what is the difference
- Expedited appeals: when to ask for an urgent review
- The No Surprises Act and out-of-network bills