CPT code 73721 covers magnetic resonance imaging of any lower extremity joint (most commonly the knee) without contrast. Knee MRI is one of the most frequently ordered imaging studies and is commonly subject to prior authorization.
Most insurers require prior authorization for knee MRI. Common PA criteria include documentation of a thorough physical exam, trial of conservative treatment (rest, ice, NSAIDs, physical therapy), and... Always verify requirements with the specific insurer and plan.
MRI of the knee is used to evaluate meniscal tears, ACL and other ligament injuries, cartilage damage, bone marrow edema, tendon pathology, and pre-surgical planning for knee surgery. It is the gold standard for evaluating internal derangement of the knee.
Most insurers require prior authorization for knee MRI. Common PA criteria include documentation of a thorough physical exam, trial of conservative treatment (rest, ice, NSAIDs, physical therapy), and X-ray results. Exceptions typically apply for acute traumatic injuries with positive exam findings suggesting surgical pathology.
Note: PA requirements vary by specific plan and member. Always verify requirements with the insurer before scheduling.
Document specific physical exam findings (positive McMurray, Lachman, joint line tenderness).
Include X-ray results. Most insurers require X-ray before approving MRI.
For non-traumatic presentations, document conservative treatment trial.
For acute injuries with mechanical symptoms (locking, giving way), these often qualify for expedited approval.
Specify which joint is being imaged and laterality in the request.
Greenlight Medical detects when CPT 73721 requires prior auth, assembles all documentation automatically, and submits to the correct payer portal. No manual lookups, no phone calls, no faxes.
See Greenlight in ActionYes, knee MRI (CPT 73721) requires prior authorization from most major insurers. Documentation of physical exam findings, X-ray results, and conservative treatment (for non-acute cases) is typically required for approval.
Most insurers require knee X-rays before approving knee MRI, as X-rays can identify fractures, arthritis, and other conditions that may change management. Exceptions apply for acute traumatic injuries where MRI is clearly indicated based on exam findings.
Standard prior authorization for knee MRI typically takes 3-5 business days. Acute traumatic injuries with surgical exam findings may qualify for urgent review (24-72 hours). Greenlight Medical expedites the process by submitting complete, guideline-aligned documentation automatically.