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Yes - typically coveredPrior auth: Always required

Does Aetna cover partial knee replacement?

Partial knee replacement (unicompartmental knee arthroplasty) is covered by all major insurance plans when arthritis is isolated to one compartment of the knee (medial, lateral, or patellofemoral) and the patient is an appropriate surgical candidate. Coverage criteria mirror total knee replacement: imaging-confirmed arthritis and failed conservative care. Robotically-assisted partial knee replacement is covered by most major insurers as equivalent to conventional partial knee replacement.

Quick summary

Coverage

Yes - typically covered

Prior authorization

Always required

Typical patient cost

With commercial insurance: $1,000-$3,500 - typically less than total knee replacement because it is often done as an outpatient procedure. Without insurance: $20,000-$40,000.

Prior authorization for Aetna

Aetna covers standard orthopedic care: evaluations, imaging, conservative treatment, and surgery. They use a Centers of Excellence program for complex procedures like spinal fusion and joint replacement, where members may pay less when using a designated facility. PPO members can self-refer to specialists. HMO members go through their primary care doctor first. Prior authorization is required for most surgical procedures.

Always verify your specific Aetna plan before scheduling. Plans within the same insurer (Aetna) can have different prior authorization rules, network requirements, and cost-sharing. Call the number on the back of your insurance card or log into your plan portal to confirm coverage for your specific plan.

How to confirm your coverage before scheduling

  1. 1Call Aetna member services (number on back of your insurance card) and ask specifically if partial knee replacement is covered under your plan.
  2. 2Ask your orthopedic surgeon's office to verify benefits on your behalf - they do this routinely and can identify in-network requirements.
  3. 3Request the prior authorization criteria in writing if prior auth is required. Ask what documentation is needed from your surgeon.
  4. 4Confirm your deductible remaining for the year - your out-of-pocket cost depends on where you are in the deductible cycle.
  5. 5Get a pre-service cost estimate from the facility if you want a specific dollar figure before scheduling.

What to do if Aetna denies coverage

Insurance denials for orthopedic procedures are common and frequently overturned on appeal. Follow these steps:

  1. 1Provide X-rays and/or MRI confirming isolated compartmental arthritis
  2. 2Document conservative care (PT, injections, bracing)
  3. 3Note that the contralateral compartment is well-preserved (supporting partial vs. total)
  4. 4For robotic-assisted: confirm insurer covers it under the same code as conventional partial knee

Common questions

Is robotic partial knee replacement covered by insurance?
Yes, by most major commercial insurers and Medicare. Robotic-assisted partial knee replacement is typically billed and covered under the same procedure code as conventional partial knee replacement. The robot is a surgical tool - it does not change the coverage determination. Some plans have added specific robotic surgery policies; confirm with your plan before scheduling.
How does partial knee replacement coverage differ from total knee replacement?
Coverage criteria are essentially the same: medical necessity based on imaging and failed conservative care. The key difference is that partial knee replacement requires documentation that arthritis is isolated to one compartment. X-rays standing (weight-bearing) views and sometimes MRI are used to confirm compartmental disease before prior auth is submitted.

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