Older adults reviewing a care plan with their clinician during a medical office consultation.
A conversation with your healthcare team can help clarify which services may need approval before your 2027 coverage begins.

What is prior authorization—and why check it during Annual Enrollment?

Some Medicare Advantage plans require approval before covering certain medical services, such as selected imaging tests, procedures or post-hospital care. This is called prior authorization. Requirements differ by plan and service, so a provider being in the network does not automatically mean every ordered service can proceed without additional approval.

As you compare 2027 coverage, ask the plan or your treating provider whether the services you routinely need require prior authorization. Review the plan's Evidence of Coverage and any current authorization information for your specific treatment. Medicare Annual Enrollment runs October 15–December 7, 2026; changes made during this period generally begin January 1, 2027.

Key distinction: The faster medical-service authorization decision deadlines described below have already applied since January 1, 2026. The new electronic information-sharing requirements are scheduled for January 1, 2027. Neither change guarantees approval of every requested service.

What protections are already in effect?

Under CMS's finalized prior authorization rules, Medicare Advantage organizations generally must respond to standard requests for medical items and services within seven calendar days and expedited requests within 72 hours, or sooner when a person's condition requires it. Limited extensions may apply in circumstances specified by the rules. Since 2026, plans must also give a specific reason when they deny a medical-service prior authorization request. These particular requirements exclude prescription drugs, which follow separate Part D processes. CMS explains the timelines and exceptions.

What changes in 2027?

Beginning January 1, 2027, CMS requires Medicare Advantage organizations and certain other payers to implement electronic interfaces that can help providers identify authorization requirements, submit requests and receive decisions. Related information-sharing requirements are intended to improve coordination when patients change coverage. These are finalized federal requirements, not merely proposed ideas. Their practical effect will depend on how individual plans and providers implement the systems. Read the CMS final-rule fact sheet.

There is also an industry initiative: AHIP and participating health plans have voluntarily pledged to streamline authorization and support faster electronic processing. AHIP's commitments are industry commitments, not a substitute for federal requirements or a guarantee that every plan has removed a particular approval rule. Read the AHIP commitments.

Changing plans while receiving treatment? Ask about the 90-day protection.

For a person who is already undergoing an active course of treatment and joins a new Medicare Advantage coordinated-care plan, CMS requires a minimum 90-day transition period during which the new plan may not require new prior authorization for that active course of treatment. This does not mean all care is automatically covered indefinitely. Ask your new plan and treating clinician to document the ongoing treatment, coverage terms and any next steps. CMS explains this existing protection.

What if your plan denies a service?

Ask for the specific reason for denial, keep the notice and discuss supporting medical records with your provider. You may be able to request an organization determination or appeal. If waiting could seriously harm your health, ask your clinician whether an expedited request or appeal is appropriate. Appeal deadlines and review times are different from initial prior authorization deadlines, so follow the instructions on your notice. Medicare explains plan appeals and expedited reviews.

Why does this matter? A 2026 HHS Office of Inspector General report, analyzing sampled skilled-nursing-facility authorization requests from June 2024, found that plans overturned many denials that beneficiaries appealed. That historical review does not establish the denial rate for your specific 2027 plan, but it underscores why understanding your rights and asking for review can matter.

Five questions to ask before choosing a 2027 plan

  1. Which services require prior authorization? Ask specifically about imaging, outpatient procedures, therapies and ongoing specialty treatment you use.
  2. Are my treating clinicians and facilities in network? Confirm with the plan and provider rather than relying on a directory alone.
  3. How will ongoing treatment continue January 1? If you are changing plans, ask how the 90-day transition protection applies to your situation.
  4. How does the plan handle denials? Ask where to find written reasons, appeal instructions and help with urgent requests.
  5. What is my complete cost picture? Review premiums, medical copays, annual out-of-pocket limits and prescription coverage alongside authorization rules.
The takeaway: Federal rules have already shortened many medical prior authorization decision deadlines, and additional electronic improvements are scheduled for 2027. But your plan's service-specific requirements still matter. Check them before December 7, especially if you have ongoing treatment.

Michael Johnson can help you review your Medicare Advantage and Part D coverage choices for 2027, including provider access, benefits and estimated costs. Visit MedicareAdvisor4u.com and click Book a Medicare Review, or call 984-400-8451.

Educational information only. This article reflects CMS, Medicare.gov, the Federal Register, HHS/OIG and AHIP information reviewed November 2, 2026. It is not personalized medical, legal or insurance advice. Discuss individual treatment decisions and urgent medical needs with your qualified healthcare professional. Plan rules and benefits vary. Medicare Advisors is not connected with or endorsed by the U.S. government or the federal Medicare program.