Prior Authorization and Medicare: Your Questions Answered.

Q1: What is prior authorization?

Prior authorization (PA) is when your doctor or medical facility must get approval from your Medicare Advantage or drug plan before providing certain services, tests, or medications. It’s a “check‑first” step: the plan reviews the request to decide if the service is medically necessary, fits coverage rules, and is being done in the right setting.

Q2: Why does prior authorization exist in the first place?

The main reasons are cost control and fraud prevention, especially on the provider side:

• It helps stop unnecessary or duplicative services, like repeating expensive imaging that was just done.

• It can catch questionable billing patterns, for example when certain clinics or suppliers bill huge volumes of high‑cost items that don’t match typical medical need.

• By blocking waste and fraud, it helps keep premiums and cost‑sharing lower than they would be if every claim were just paid automatically. When PA is used correctly, it protects both the Medicare program and your wallet.

Q3: How does provider fraud or overuse affect my premiums and copays?

When providers over‑treat patients or outright commit fraud, Medicare (or the Medicare Advantage plan) pays out more than it should. That extra spending shows up later as:

• Higher premiums for Medicare Advantage and Part D plans

• Higher cost‑sharing (copays, coinsurance, deductibles) for members

• Pressure on Medicare finances overall, which can lead to policy changes that affect benefits

Prior authorization focuses on services where abuse and overuse are common, like expensive imaging, certain surgeries, high‑cost drugs, and some durable medical equipment. The objective is to keep bad actors from driving everyone’s costs up.

Q4: How does prior authorization work in Original Medicare vs Medigap vs Medicare Advantage?

Original Medicare (Parts A & B)

Medicare does not cover everything, automatically, but instead generally covers a service when it meets these core criteria:

• Medically Necessary: The service must be considered reasonable and necessary to diagnose or treat a medical condition. This is the central standard Medicare uses.

• Covered benefit category: The service must fall within a category of benefits defined by law (e.g., inpatient hospital care, physician services, lab tests, durable medical equipment). Medicare cannot cover services outside these statutory categories, even if medically needed.

• Not explicitly excluded: Certain services are specifically excluded by law, such as routine dental, vision, hearing, and cosmetic surgery (with limited exceptions).

• Provided by an enrolled provider: The service must be furnished by a Medicare-enrolled provider or supplier who accepts Medicare.

• Appropriate setting and frequency: Coverage may depend on where the service is delivered (e.g., inpatient vs. outpatient) and how often (some services have frequency limits).

Beyond these guidelines, historically, Original Medicare has used very little prior authorization. Most services that meet Medicare’s coverage rules are paid when billed. That is starting to change in targeted ways. Medicare is testing broader use of prior authorization and related “pre‑check” tools in a handful of states (New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington) in 2026. These pilots focus on specific high‑risk or high‑cost services and areas with a history of fraud or heavy overuse. The idea is to see whether adding PA on certain services can reduce waste and abuse without blocking appropriate care.

If you’re on Original Medicare:

• You still see far fewer PA requirements than in Medicare Advantage.

• You may notice more oversight in certain categories (like some equipment or frequent services) if you live in one of the test states.

• Your doctor or supplier usually carries the burden of dealing with those approvals.

  
  

Medigap (Medicare Supplement)

Medigap works very differently. Medigap policy carriers do not decide what is medically necessary and do not have their own prior authorization lists for Part A and Part B services. Medigap policies simply pay their share after Original Medicare pays. If Medicare approves and pays, your Medigap pays its part as the policy describes; if Medicare denies, Medigap doesn’t override that decision.

So if you have Original Medicare plus Medigap:

• You mainly deal with whatever oversight Original Medicare itself has put in place.

• You do not face a second layer of PA from your supplement on top of Medicare’s rules.

Separate note: if you have a stand‑alone Part D drug plan, that plan can have prior authorization rules for certain medications.

Medicare Advantage (Part C)

Medicare Advantage is where most people encounter prior authorization. That's because plans receive a fixed payment from the federal government per enrollee and are responsible for managing total care costs. Plan carriers use PA as a utilization management tool to ensure care is medically necessary, in line with evidence-based guidelines, and delivered in the most appropriate setting (for example, outpatient versus inpatient).

Typical areas that may require PA in Medicare Advantage include:

• Non‑emergency hospital admissions

• Skilled nursing stays

• Some outpatient surgeries and procedures

• Certain imaging (MRI, CT, PET, etc.)

• Some home health, rehab, or specialty therapies

• Higher‑tier or specialty medications under the Part D benefit

  
  

It is important to note that there is increasing and ongoing pressure from regulators and advocacy groups to make PA in Medicare Advantage faster, more transparent, and less likely to delay or deny medically necessary care

Q5: Isn’t prior authorization just a way for plans to avoid paying for care?

Sometimes PA is misused, and that’s the part that understandably frustrates people. Two realities exist at the same time:

1. Legitimate use-

   • Many approvals go through smoothly and you never hear about them.

   • PA prevents truly unnecessary, duplicative, or unsafe care and protects you from surprise bills for non‑covered services.

2. Problematic use-

   • Some carriers push the limits and deny or delay care that should be covered.

   • This can look like:

     • Very strict interpretations of “medical necessity”

     • Forcing you to “fail” cheaper options that aren’t appropriate for you

     • Asking for the same documentation over and over to wear people down

       
       

So yes, there have been instances where some plan carriers have used PA to avoid paying for necessary care. But not all, and not all the time. That’s why it's important to understand your carrier's reputation and to know your rights.

Q6: How can prior authorization actually be good for me as a patient?

When it’s working the way it should, PA:

• Reduces unnecessary procedures that carry risk but little benefit.

• Encourages evidence‑based care, aligned with clinical guidelines for your condition.

• Limits waste and fraud, helping keep premiums and copays lower.

• Creates predictability: decisions about coverage happen before the service, so you’re less likely to face big “gotcha” bills afterward.

Q7: What can I do if my prior authorization is denied but my doctor says the care is necessary?

You are not stuck with the first “no.” Steps you can take include:

• Ask for the reason in writing. The notice should explain exactly why the plan denied the request and what rule or guideline they used.

• Have your doctor respond. They can send additional records, test results, and a clear medical explanation for why this is necessary in your specific case.

• File an appeal. Every Medicare Advantage and Part D plan has a multi‑step appeals process. If a delay could seriously harm your health, request an expedited (faster) review.

• Keep records. Save letters, dates of calls, names of representatives, and what was said.

Many denials are overturned once the plan has more complete information or the case is reviewed at a higher medical level.

Q8: What can you do to reduce the chances of problems related to prior authorization?

Here are some things to keep in mind as you navigate PA:

• Before a big test, surgery, or expensive new medication, ask your provider: “Does my plan require prior authorization for this?” and “Will your office handle the prior authorization, or do I need to do anything?”

• Make sure your providers have a full, accurate picture of your health history and prior treatments.

• Review your plan's Evidence of Coverage (EOC) if you'd like to know what types of services usually require prior authorization.

• If you feel stuck or are confused, call your Medicare insurance agent. They should be able to help confirm whether a service requires PA on your plan, help interpret denial letters, talk through if and how to appeal, and keep your issues in mind when it's time to review plans during the Annual Enrollment Period (AEP).

• Speak up to regulators if a pattern looks abusive. Complaints to Medicare and your state can contribute to broader reforms when certain practices cross the line.

  
  

Q9: Should I avoid Medicare Advantage entirely because of prior authorization?

Not necessarily. For many people, Medicare Advantage offers exceptional value including lower premiums versus Medigap, the security of an out-of-pocket maximum that you don't get with Original Medicare, prescription drug coverage under one premium, and extra benefits like dental, vision, hearing, fitness, and more.

The trade‑off for these benefits is more managed care, including prior authorization and network rules. Whether it’s worth it depends partly on your health status and how often you use healthcare, your tolerance for administrative processes and "friction", and the specific track records of Medicare Advantage plan carriers when it comes to PA and appeals in your area.

Q10: What’s the bottom line for me?

In summary:

• Prior authorization exists to reduce unnecessary spending and provider‑side fraud, which helps keep premiums and cost‑sharing from rising even faster.

• Some carriers do misuse PA, causing delays or denials of necessary care, but you have rights, and access to tools to push back.

• If PA is handled well, you may never notice it; it works in the background to keep care appropriate and costs in check.

  
  
  
  

At Milestone Medicare, our job is to help our clients understand their coverage, ensuring plan choice matches medical needs, budget, and tolerance for administrative oversight. For more information, call us at 763-878-5994 or contact us today.