If Medicare or your Medicare Advantage plan denied a prior authorization, you have the right to appeal, and the odds are in your favor. Federal data shows most Medicare Advantage prior authorization denials that get appealed are fully or partially overturned. The process starts with a written appeal filed within 60 to 65 days of the denial letter, called a redetermination or reconsideration depending on your plan type. This article walks through exactly what to do, the deadlines you cannot miss, and what changed under new 2026 federal rules that are supposed to make this faster.
Why Medicare Denies Prior Authorizations
Prior authorization is a requirement that your doctor get approval from Medicare or your Medicare Advantage plan before you can get certain services, tests, procedures, or durable medical equipment, like insulin pumps, continuous glucose monitors, imaging, or specialty medications. If the plan denies the request, treatment gets delayed or you get stuck with the full bill.
Common reasons for denial include:
- Missing or incomplete clinical documentation from your doctor
- The plan says the treatment is not "medically necessary" based on its internal criteria
- Wrong diagnosis code or billing code submitted
- The plan wants you to try a cheaper alternative first (step therapy)
- Paperwork submitted to the wrong department or after a deadline
For people managing diabetes, heart disease, or high blood pressure, the most commonly denied items are continuous glucose monitors (CGMs), insulin pumps, certain cardiac imaging, and newer brand-name medications when a generic exists. Many of these denials happen because the plan's system did not see updated lab results, like a recent A1C reading or a documented history of failed alternative treatments, not because the treatment was actually inappropriate.
What Changed for 2026
Starting January 1, 2026, a new CMS rule (CMS-0057-F) requires Medicare Advantage plans to:
- Decide standard prior authorization requests within 7 calendar days (down from 14)
- Decide expedited (urgent) requests within 72 hours
- Provide a specific clinical reason for every denial, not a generic form letter
- Automatically forward an upheld denial to the federal Independent Review Entity (IRE) if you appeal, so you do not have to separately request that step
These changes matter because you can now hold your plan to a specific deadline, and you can quote the exact clinical reason they gave back to them in your appeal, which is far more effective than a general "please reconsider" letter.
Step-by-Step: What to Do After a Denial
1. Read the denial notice carefully
Your denial letter (sometimes called a Notice of Denial of Medical Coverage or an Explanation of Benefits) should state the specific clinical reason for the denial and your appeal deadline. If it does not give a specific reason, that itself is grounds to push back, since 2026 rules require plans to cite specific criteria.
2. Call your doctor's office the same day
Your doctor's office typically submitted the original prior authorization request and has the clinical records the plan is asking about. Ask them to:
- Confirm what documentation was originally submitted
- Add any missing records (recent labs, A1C results, imaging, notes on failed prior treatments)
- Request a peer-to-peer review, where your doctor speaks directly with the plan's medical director
A peer-to-peer review resolves many denials before you ever have to file a formal written appeal.
3. File a written appeal before the deadline
| Plan Type | What It's Called | Deadline to File | Plan's Decision Timeline |
|---|
| Original Medicare (Part A/B) | Redetermination | 120 days from denial notice | 60 days |
| Medicare Advantage (Part C) | Reconsideration | 60 to 65 days from denial notice | 7 days standard, 72 hours expedited |
| Medicare Part D (drug plan) | Redetermination | 60 to 65 days from denial notice, exception request first | 72 hours standard, 24 hours expedited |
For urgent situations, such as an insulin pump failure or a treatment needed to prevent hospitalization, ask for an expedited (fast) appeal. Say the words "my health could be seriously harmed by waiting" when you call, since that specific language triggers the faster review timeline.
4. Escalate if the plan upholds the denial
If your Medicare Advantage plan denies the appeal at Level 1, it must automatically send your case to the federal Independent Review Entity, MAXIMUS, for Level 2 review. You do not need to file anything extra for that step under the 2026 rules, but you should still confirm it happened by calling your plan.
If Level 2 also denies you and the amount in dispute is at least $200 in 2026, you can request a hearing with the Office of Medicare Hearings and Appeals (OMHA) for Level 3. Level 4 is a review by the Medicare Appeals Council, and Level 5 is federal court, which requires at least $1,960 in dispute value for 2026.
5. Keep copies of everything
Save every letter, fax confirmation, and call log with the date, time, and name of who you spoke with. If your appeal goes past Level 1, you will need this paper trail.
Medicare Appeal Levels and Deadlines at a Glance
| Level | Who Reviews It | Deadline to File | Decision Time |
|---|
| 1: Redetermination/Reconsideration | Your plan or Medicare contractor | 60 to 120 days depending on plan type | 7 to 60 days |
| 2: Independent Review | Qualified Independent Contractor or MAXIMUS (IRE) | Automatic for MA plans; 180 days for Original Medicare | 7 to 60 days |
| 3: OMHA Hearing | Administrative law judge | 60 days from Level 2 decision | Varies |
| 4: Appeals Council | Medicare Appeals Council | 60 days from Level 3 decision | Varies |
| 5: Federal Court | U.S. District Court | 60 days from Level 4 decision | Varies |
Most successful appeals are resolved at Level 1 or Level 2. You rarely need to go further than that if your documentation is solid.
What to Include in Your Written Appeal
A strong appeal letter includes:
- Your name, Medicare number, and the date of the denial notice
- The specific service, device, or medication that was denied
- The exact clinical reason the plan gave for denying it (quote it directly)
- A rebuttal addressing that specific reason, ideally with a letter from your doctor
- Recent test results or records that support medical necessity (A1C levels, blood pressure logs, cardiac test results, notes on medications already tried)
- A clear request: "I am requesting the plan reverse its denial and approve [treatment/device/medication]."
Getting Help With the Appeal
Filing a Medicare appeal correctly, especially for a Medicare Advantage plan with its own portal, fax number, and internal forms, is confusing even for people who are used to paperwork. If you are managing diabetes, heart disease, high blood pressure, or another chronic condition and do not have the time or energy to chase down peer-to-peer reviews and appeal letters on top of everything else, a free Medicare care advocate service can take that off your plate. These advocates work on your behalf to gather the right documentation, contact your plan directly, and push your prior authorization dispute through the appeal levels, at no cost to you.
Answer a few quick questions about your Medicare coverage and health situation to see if a free care advocate is available to help with your denial.
Tips That Actually Move the Needle
- Call, then follow up in writing. Phone calls can resolve issues faster, but always follow up with a written appeal so there is a paper trail with a legal deadline attached.
- Ask for the specific denial code and criteria. Under 2026 rules, plans must give you this. It tells you exactly what to address in your appeal.
- Request a peer-to-peer review early. This step alone resolves a large share of denials without ever reaching a formal appeal.
- Do not miss the deadline. Missing your appeal deadline can mean starting over or losing your right to appeal that specific denial entirely.
- Ask about a continuation of benefits. If you are already receiving a treatment and the plan is trying to reduce or stop it, you may be able to keep receiving it during the appeal if you file quickly, usually within 10 days of the notice.
Frequently Asked Questions
How long do I have to appeal a Medicare prior authorization denial?
For Medicare Advantage plans, you generally have 60 to 65 days from the date of the denial notice to file a Level 1 appeal (reconsideration). For Original Medicare, you have 120 days to file a redetermination. For Medicare Part D drug denials, you typically have 60 to 65 days after first requesting a coverage determination or exception.
How fast does Medicare have to respond to my appeal in 2026?
Under the new CMS-0057-F rule effective January 1, 2026, Medicare Advantage plans must decide standard prior authorization appeals within 7 calendar days and expedited (urgent) appeals within 72 hours. Part D plans must decide within 72 hours for standard requests and 24 hours for expedited requests.
What is a peer-to-peer review and should I request one?
A peer-to-peer review is a phone conversation between your doctor and the health plan's medical director about your specific case. It is one of the fastest ways to overturn a denial because your doctor can explain clinical details that may not have been clear in the original paperwork. You should ask your doctor's office to request one as soon as you learn about a denial.
Can I keep getting my treatment while I appeal?
In some cases, yes. If you are already receiving a service and the plan wants to reduce or terminate it, you may be able to request continuation of benefits during your appeal, but you usually need to file within a short window, often 10 days of the notice. Ask your plan directly about this option since it varies by situation.
What happens if my appeal is denied at every level?
If your Medicare Advantage plan denies your appeal, it automatically escalates to an independent federal reviewer (the IRE). If that reviewer also denies you and your dispute is worth enough money, you can request a hearing with an administrative law judge, then the Medicare Appeals Council, and finally federal court. Most people never need to go past the first two levels.
Do I need a lawyer to appeal a Medicare denial?
No. Most Medicare appeals, especially Level 1 and Level 2, do not require a lawyer. Your doctor's office, a SHIP counselor, or a free Medicare care advocate service can help you prepare and file the appeal. A lawyer becomes more common only if your case reaches OMHA or federal court.
Is there a free service that can help me handle this?
Yes. Free Medicare care advocate programs exist specifically to help people with chronic conditions handle prior authorization denials and appeals without navigating the process alone. You can check your eligibility for a free Medicare care advocate in a few minutes.
