Medicare Advantage Prior Authorization

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Quick answer

Prior authorization is a Medicare Advantage rule requiring plan approval before it will cover certain services, like imaging, surgeries, or skilled nursing care. KFF reports it is the most common Advantage complaint, though new CMS rules for 2026 speed up decisions and limit some requirements.

Prior authorization is the most-discussed Medicare Advantage rule. Here is what it is, what it affects, and how to handle it.

What is prior authorization?

Prior authorization means your Medicare Advantage plan must approve a service before it agrees to pay for it. Plans commonly require it for higher-cost care such as advanced imaging (MRI, CT), planned surgeries, skilled nursing facility stays, certain specialist services, and some prescription drugs. The goal is to control costs and confirm care is medically necessary, but the process can delay treatment and frustrate patients and doctors. According to KFF, prior authorization is the leading complaint among Medicare Advantage members. Original Medicare rarely uses it. Knowing your plan's rules before you need care is essential, and a 1-800-MEDIGAP advisor can explain them clearly.

What to do if care is denied

If your plan denies a prior authorization, you have the right to appeal, and many denials are overturned on appeal. Start by asking your doctor to submit supporting documentation, then follow your plan's formal appeal steps; you can escalate through multiple levels, including independent review. New CMS rules taking effect for 2026 require faster decisions and continuity of care when you switch plans, easing some delays. Still, prior authorization remains a key reason some seniors prefer Original Medicare with Medigap. If your plan's rules are causing problems, call 1-800-MEDIGAP (1-800-633-4427) to review whether a different plan or path fits you better.

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Frequently asked questions

What is prior authorization in Medicare Advantage?+

Prior authorization is a requirement that your Medicare Advantage plan approve certain services, like imaging, surgery, or skilled nursing care, before it will cover them. It's meant to control costs and confirm medical necessity but can delay care. Original Medicare rarely requires it.

What services need prior authorization?+

Plans most often require prior authorization for advanced imaging (MRI, CT scans), planned surgeries, skilled nursing facility stays, home health, certain specialist services, durable medical equipment, and some prescription drugs. Requirements vary by plan, so check your plan documents or ask a 1-800-MEDIGAP advisor.

Can I appeal a prior authorization denial?+

Yes. You have the right to appeal a Medicare Advantage denial, and many denials are overturned. Ask your doctor to submit supporting records and follow your plan's appeal steps, which can escalate to independent review. Call 1-800-MEDIGAP if you need help understanding the process.

Does Original Medicare require prior authorization?+

Rarely. Original Medicare requires prior authorization for only a limited set of services, far fewer than Medicare Advantage. This is one reason some seniors who want fewer access hurdles choose Original Medicare with a Medigap policy. A 1-800-MEDIGAP advisor can compare both approaches for you.

Are prior authorization rules changing in 2026?+

Yes. New CMS rules taking effect for 2026 require Medicare Advantage plans to make faster prior-authorization decisions and provide continuity of care when members switch plans, aiming to reduce harmful delays. The rules don't eliminate prior authorization but seek to streamline it. Call 1-800-MEDIGAP for details.

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