Plan Basics
Prior Authorization: When a Covered Benefit Still Needs Permission
Medicare Advantage plans review some services before they happen. Understanding the timeline and the appeal path is the difference between a delay and a denial.
Figures reviewed for 2026
By the SecureCare65 editorial team · Published October 13, 2026 · Reviewed for 2026 by a licensed agent
Prior authorization means a Medicare Advantage plan reviews a service before it happens and decides whether it will pay. Original Medicare rarely does this. The requirement is legal and legitimate, and it is also where a covered benefit can feel like a request.
What requires approval, and on what timeline
Plans publish a list of services requiring prior authorization each year, and it commonly includes inpatient admissions, imaging such as MRI and CT scans, skilled nursing placement, home health, certain procedures, and many drugs. The list changes annually and is worth reading before you need it.
The plan must decide within fourteen days for a standard pre-service request and within seventy-two hours for an expedited one, and it must tell you in writing if it says no. If the plan misses the deadline, that failure can itself become grounds for an appeal.
Your rights when the answer is no
A denial must state the reason and cite the criteria used. You can request a reconsideration, generally within sixty days, and you can then take it to an independent review entity outside the plan. For a service you are already receiving, you can request that coverage continue while the appeal proceeds.
The most effective appeals are clinical rather than emotional. A short letter from the treating physician explaining why the specific service is medically necessary, with the guideline criteria quoted back, wins far more often than a patient's account of how much they need it.
Tighter rules than a few years ago
Federal rules have been tightening around the use of automated decision tools, the specificity of denial reasons, and the sharing of clinical data between plans and providers. The practical effect is that a denial should now come with a clearer explanation than it once did, and a vague one is worth challenging.
That is not a guarantee. Volume is high, medical directors review a fraction of requests, and administrative denials from missing paperwork remain common. Documentation discipline on the provider's side prevents most of them.
How to keep a plan working for you
Check the formulary and the prior authorization list during the enrollment window, not in the middle of an illness. Ask the specialist's office whether they handle the authorization or expect you to. Keep every denial letter and every approval, and confirm an approval's dates before scheduling, because an approval granted in December may not carry into January.
The short version
A prior authorization is a legal review with a deadline and an appeal path, not a final verdict. Read the plan's list in the fall, let the specialist's office file the request, and appeal in writing with clinical documentation if it comes back denied.
Official source
The federal guide behind this page
Medicare publishes its own handbook on this topic. It is linked here so you can check any figure on this page against the source.
- Understanding Medicare Advantage PlansCMS 12026Read the PDFOrder print
- Understanding Your Advantage Plan’s Provider NetworkCMS 11941Read the PDF
- Medicare AppealsCMS 11525Read the PDFOrder print
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Official sources
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Every figure on this page comes from the agencies below. They are the primary record, and none of these links costs you anything.
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