Prior authorization for MRI: what the request needs

MRI is one of the most frequently reviewed outpatient services, and most refusals come down to timing: the scan was requested before conservative care had run long enough, or the note did not say why waiting was unsafe. A request that states either the treatment history or the red flag clearly tends to move faster.

What reviewers typically look for

For musculoskeletal and spinal MRI, reviewers generally ask two questions. Has a reasonable period of conservative management been tried and failed? Or is there a reason not to wait? Either path can justify the scan, but the note has to say which one applies.

For brain MRI, the question is usually whether the symptoms carry features that raise concern for a structural cause, as opposed to a primary headache pattern that imaging would not change.

• Duration of symptoms and of each conservative measure, in weeks, with what was used: physiotherapy sessions, analgesia, activity modification.
• Objective neurological findings: dermatomal sensory loss, myotomal weakness with a power grade, reflex changes, straight leg raise angle.
• Red flags when present: bladder or bowel dysfunction, saddle anaesthesia, progressive weakness, history of cancer, fever or immunosuppression, significant trauma, unexplained weight loss.
• Prior imaging and its result, such as a plain radiograph, so the MRI is not seen as a first-line test.
• What the result will change: referral for injection, surgical opinion, or a change in diagnosis.

Structuring the request

1. State the study precisely. Body region, with or without contrast, and the procedure code. MRI lumbar spine without contrast is 72148; MRI brain without and then with contrast is 70553.
2. Give the working diagnosis and its code. Code the presenting problem when the diagnosis is not yet confirmed, for example M54.16 for lumbar radiculopathy or R51.9 for headache.
3. Lay out the timeline. Onset, each treatment with dates, and the current status.
4. Document the examination. Positive and relevant negative findings, with grades.
5. Name the reason for imaging now. Failed conservative care, a red flag, or both, and what decision the result will inform.

Example

Request: MRI brain without and with contrast (70553).
Diagnosis: Headache, unspecified (R51.9), with a new focal neurological sign.

[Patient initials], 54, with no prior headache history, reports six weeks of progressive daily headache, worse on waking and on bending forward. Paracetamol and ibuprofen give little relief.

Examination today: mild left pronator drift and reduced fine finger movements of the left hand. Fundoscopy was limited; no papilloedema seen.

A new headache pattern after the age of 50 with a progressive course and a focal motor sign is not consistent with a primary headache. Imaging is requested to exclude a structural intracranial cause. An urgent pathway has been discussed with the patient in case of any deterioration.

Note that the excerpt does not claim a period of conservative treatment. The case rests on red flags, and it says so.

Common refusal reasons and how the chart prevents them

ClearPass takes the visit note, whether transcribed or typed, and drafts the MRI justification with ICD-10 and procedure codes in Concise, Standard or Detailed length. If the note lacks a duration or a power grade, it asks you before writing. You review the draft and file it; nothing is sent for you. Where a denial has already come back, Rejection Analysis rewrites the justification against the stated reason.

What ClearPass does not do

• It does not replace your judgement. Every note is an AI draft that you review and correct before it is used.
• It is not a medical device and does not make clinical decisions. It is a documentation aid.
• It does not connect to your EMR. The note is copy-ready text that pastes into any system.

Privacy

Clinical note content is not stored on ClearPass servers: it is processed to write the note, then discarded. Consultation audio is transcribed and discarded, never stored. Your note history stays in your browser, on your device, and you choose how long it is kept. Common identifiers are removed from typed and transcribed text before it reaches the AI; that is a best-effort safeguard, so leave names, ID numbers and file numbers out where you can. Processing goes through the AI providers named in our Privacy Policy, which sets out exactly what each one receives and how long it keeps it. ClearPass does not sign HIPAA business associate agreements today.

Questions

Related

• Prior authorization for a CT scan
• Prior authorization letters written from the visit itself
• ICD-10 codes that support a prior authorization request
• SOAP note example: low back pain