Medicare Advantage Prior Authorization: 2026–2027 Checklist

Bottom Line

Check a Medicare Advantage plan's authorization requirements for your expected care before enrolling; proceeding without required approval can leave you owing the full cost. Referral requirements are separate, so verify both rules for scheduled services.

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Prior authorization means a Medicare Advantage plan must approve a service, supply, or prescription before you receive it. If care that requires it goes ahead without that approval, you can be responsible for the full cost. Medicare notes that if you have a Medicare Advantage Plan, you’ll typically need prior authorization from your plan before it covers certain services or supplies, and it recommends contacting the plan with questions about coverage. The practical takeaway: before you join any plan, check the authorization rules for the specific care you already expect to need.

If your business also needs life insurance for an SBA loan, review that lender requirement separately; it has no bearing on Medicare authorization or enrollment.

What prior authorization actually is

Prior authorization is one type of coverage decision. Your provider submits a request, and the plan reviews it against coverage rules before the service happens or the prescription is filled. Aetna’s Medicare materials describe it the same way: the plan reviews and must approve the provider’s request before you receive care or fill a prescription, and if you get care or fill a prescription before approval, you may owe the full cost.

Prior authorization is not the same as a referral. Some plans require a referral from your primary care doctor before you see a specialist; Aetna points out that referrals aren’t the same as prior authorization, but you may need both. Check the plan’s documents for both rules.

What federal rules require of Advantage plans

Plans can’t make up their own rules freely. For Medicare’s basic benefits, a 2024 CMS final rule and guidance confirm that plans must make medical necessity decisions based on your individual circumstances — your medical history, physician recommendations, and clinical notes — and must follow Traditional Medicare’s established coverage criteria such as National and Local Coverage Determinations. Where Medicare’s criteria are not fully established, plans may use internal criteria, but those criteria must be evidence-based and publicly accessible, including being available on a website without a paywall or subscription. CMS has also said that algorithms or AI tools can assist coverage decisions but cannot replace an individualized assessment — for example, a predictive length-of-stay score alone cannot be the basis for terminating post-acute care.

A newer protection took effect for contract year 2026: under CMS’s CY2026 final rule, a plan that approves an inpatient hospital admission can generally only reopen that approval for obvious error or fraud, so an approved admission must be honored.

What commonly requires authorization

Requirements vary by plan, but categories to ask about include:

• Inpatient hospital stays — including planned admissions before a scheduled surgery.
• Skilled nursing facility and other post-acute care — admission and continued-stay reviews.
• Outpatient surgery and advanced imaging — such as MRIs and CT scans.
• Durable medical equipment — wheelchairs, oxygen, and similar items.
• Specialist visits — some plans require prior authorization for certain specialists in addition to any referral rules.
• Part B and Part D drugs — some drugs on a plan’s formulary carry prior authorization requirements; carriers such as Aetna publish prior authorization drug lists, and your provider or pharmacist will typically flag them.

How to check before you join

1. List the care you expect in the next year. Upcoming surgeries, regular infusions, DME, specialist visits, and prescriptions.
2. Read the plan’s prior authorization lists. Carriers publish medical-service and drug lists — for example, Aetna publishes separate lists for medical services, Part B drugs, DME, and formulary drugs requiring approval.
3. Check the public coverage criteria. For services where Medicare’s criteria aren’t fully established, the plan’s internal criteria must be publicly accessible on its website.
4. Ask about your drugs specifically. Review the plan’s formulary and note any prior authorization, step therapy, or quantity limits on your medications.
5. Check referral rules separately. For 2026, for example, UnitedHealthcare states that most of its Medicare Advantage HMO and POS plans require a PCP referral before certain specialist services in outpatient, office, or home settings.
6. Get answers in writing. If a specific planned procedure is covered and what the cost sharing will be, ask for the answer documented.

Timelines and your appeal rights

For 2026, standard prior authorization decisions on medical items and services are generally due within seven calendar days, or 72 hours when expedited, subject to applicable rules and extensions. Drug decisions follow separate timelines. Do not confuse an initial request with an appeal: standard pre-service Advantage appeals generally have a 30-day decision window, payment appeals 60 days, and expedited appeals 72 hours. Ask which process applies and follow the notice’s instructions.

If a prior authorization is denied, you can appeal. Medicare Advantage appeals have five levels. A Level 1 reconsideration must be filed within 65 days of the initial denial notice, and if the plan upholds its denial, the appeal is automatically forwarded to an Independent Review Entity at Level 2. Your doctor can request reconsiderations on your behalf, and a doctor’s supporting note strengthens the appeal. CMS’s 2026 rule also closed appeal loopholes, clarifying that appeal rights apply to adverse decisions made before, during, or after you receive services.

How plan type shapes your authorization experience

Network rules and authorization rules stack on top of each other. An HMO generally requires you to use network providers and get referrals for specialists; a PPO lets you go out of network but usually at higher cost. When you’re choosing a Medicare Advantage HMO or PPO, verify both the referral rules and the prior authorization lists for the specific plan — the plan’s own documents, not generalizations about the plan type, control what you’ll face. Carrier practices also shift year to year, as UnitedHealthcare’s 2026 referral changes show, so recheck each plan year.

If you have ongoing or chronic conditions

If you manage a chronic condition, prior authorization review affects your doctors, drugs, and supplies together, not separately. When evaluating diabetes care in Medicare Advantage plans, look at whether your endocrinologist is in network, whether your insulin and supplies sit on tiers with utilization rules, and whether a Chronic Special Needs Plan (C-SNP) is available in your county — these plans exist only where offered and for qualifying conditions, so availability is not guaranteed. Also note a 2026 change UnitedHealthcare announced: new or existing SNP members need a qualifying chronic condition to access benefits covering healthy food or utilities, with providers contacted to verify.

The financial stakes: a worked example

Prior authorization failures most often hurt financially around hospital care. Use a clearly stated scenario to compare plans. In the 2026 Humana Full Access H7617-052 PPO Evidence of Coverage (a Michigan plan), inpatient stays cost a $440 copayment per day for days 1–6 and $0 for days 7–90, with a $5,650 maximum out-of-pocket for covered Part A and Part B services — but only if the stay is authorized and covered. If a plan denies a prior authorization for a planned admission and you proceed anyway, those negotiated copays may not apply at all. When comparing hospital costs under a Medicare Advantage plan, check both the day-by-day copay structure and the out-of-pocket maximum, then confirm the authorization requirement for any scheduled admission with the plan in writing. Your own county’s plans will have different numbers — that example illustrates how to read a plan document, not a quote available to you.

If your doctor or network changes mid-year

Authorization rules are tied to the plan you joined, and networks can change during the year. Plan documents, including the Humana EOC cited above, note that provider networks may change at any time, with notice and transition requirements that depend on the provider and change. If your doctor leaves the network, the practical steps are to confirm the effective date, ask whether any transition-of-care exceptions apply, and check what enrollment options exist. If that happens, our guide to keeping your doctor after a network change walks through verifying the dates and the options available to you before you decide to switch plans.

Your next step: compare before you enroll

Prior authorization is manageable when you know the rules in advance — and painful when you discover them in a denial letter. Before choosing a plan, pull together the list of care you expect this year, check each plan’s prior authorization lists, formulary rules, and public coverage criteria, and get written answers on anything scheduled. If you want help working through that comparison for the plans available in your county, you can explore local Medicare Advantage coverage and prepare a side-by-side list of authorization questions to ask about each plan before you enroll.