Medicare Advantage Plans 2026: How They Work, What They Cost, and Who They're Right For

More than 35 million people — over half of all Medicare beneficiaries — are now enrolled in Medicare Advantage. It's the dominant choice. But for retirees with meaningful income, the math looks very different than it does for the average beneficiary. Here's what you need to understand before you decide.

What Medicare Advantage actually is

Medicare Advantage, officially called Medicare Part C, is an alternative way to receive your Medicare benefits. Instead of the federal government paying your claims directly through Original Medicare (Parts A and B), you enroll in a private health plan that has contracted with CMS to provide those same benefits — plus, in many cases, Part D prescription drug coverage — through their network.

You must still be enrolled in Medicare Parts A and B. You must still pay the Part B premium (and any IRMAA surcharges). What changes is how your care is delivered: through the MA plan's network, subject to the plan's cost-sharing structure and, critically, its prior authorization requirements.

As of 2026, approximately 35.4 million beneficiaries are enrolled in Medicare Advantage — up from 34 million in 2025, representing roughly 54% of all Medicare-eligible individuals.¹

Medicare Advantage plan types

HMO (Health Maintenance Organization)

The most common MA structure — about 54% of MA enrollees are in HMO plans.² HMOs require you to use a network of doctors and hospitals. You typically need a primary care physician (PCP) who coordinates referrals to specialists. Out-of-network care is generally not covered except in emergencies. HMOs tend to have the lowest premiums and most aggressive cost-sharing structures — but the network constraint is real and matters significantly for people with complex or ongoing specialist needs.

PPO (Preferred Provider Organization)

About 45% of MA enrollees are in local PPO plans, with less than 1% in regional PPOs.² PPOs allow out-of-network care but charge significantly higher cost-sharing when you go outside the network. You don't need a PCP or referrals. The flexibility is real — but the out-of-network cost share (often 40–50%) can add up quickly. MA PPOs have a separate, higher out-of-pocket maximum for out-of-network care.

PFFS (Private Fee-for-Service)

PFFS plans set their own payment terms. Any Medicare-participating provider who accepts the plan's terms can treat you — which sounds like Original Medicare's flexibility, but providers can decline to accept PFFS terms on a visit-by-visit basis. Less common than HMO or PPO.

SNP (Special Needs Plans)

Special Needs Plans are restricted to specific populations and always include Part D drug coverage:

• D-SNP (Dual Eligible): For people enrolled in both Medicare and Medicaid. Provides coordinated care across both programs.
• C-SNP (Chronic Condition): For beneficiaries with specific chronic conditions — diabetes, heart failure, COPD, dementia, and others. Plans are tailored to the condition's care needs.
• I-SNP (Institutional): For people living in long-term care facilities (nursing homes).

If you qualify for a SNP, it is worth evaluating — the care coordination benefits can be substantial. Most high-income retirees do not qualify for D-SNPs (which require low income/assets) but may eventually qualify for C-SNPs as health conditions develop.

2026 Medicare Advantage costs

Monthly premium

Many MA HMO plans charge $0 in additional monthly premium beyond what you already pay for Part B. PPO plans more commonly charge $50–$200/month. Some MA plans offer a Part B premium reduction (a "give-back" benefit) that partially offsets your Part B cost — typically $25–$100/month in areas where this is offered. The $0-premium headline is appealing, but it's not the full cost picture.

Out-of-pocket maximum

CMS requires all Medicare Advantage plans to cap in-network out-of-pocket costs (for Medicare-covered Part A and B services) at no more than $9,250 in 2026 — down from $9,350 in 2025.³ The average MA plan's actual in-network OOP limit is lower: approximately $6,074.³ PPO plans have a separate, higher OOP cap for out-of-network care.

Prescription drug costs (Part D) are tracked separately and capped at $2,100 in 2026 under the Inflation Reduction Act's Part D OOP cap.⁴

Cost sharing

MA plans use copays and coinsurance rather than Original Medicare's structure. A typical HMO might charge $10–$30 per primary care visit, $40–$60 per specialist visit, $300–$500 per hospital day (up to a maximum), and $150–$300 per outpatient surgery. These add up. Someone hospitalized for 5+ days can approach the plan's OOP maximum in a single event. By contrast, a Medigap Plan G holder pays zero once the $1,736 Part A deductible is met, because Plan G covers 100% of Part A coinsurance.

IRMAA applies regardless of your MA plan

This is the fact most often missed when high-income retirees evaluate Medicare Advantage: Part B IRMAA surcharges do not go away because you're in a Medicare Advantage plan. You pay the Part B premium and any income-related surcharge on top of — and separately from — whatever your MA plan charges.

A couple with $350,000 in 2024 MAGI both pay $527.90/month for Part B — $1,055.80/month combined — whether they're on Original Medicare with Plan G or on $0-premium Medicare Advantage plans. The MA plan's $0 premium doesn't offset that. The real comparison for high-income enrollees is: Original Medicare + Medigap total cost vs. MA plan total cost including Part B, IRMAA, the plan premium, and expected cost sharing.

Part D IRMAA surcharges also continue if you're enrolled in an MA plan with drug coverage (an MAPD plan). Use our IRMAA bracket calculator to see your combined Part B + Part D surcharges by income tier.

Prior authorization: the friction that surprises MA enrollees

Medicare Advantage plans use prior authorization as a utilization management tool. Before covering certain procedures, specialist visits, imaging studies, home health services, or inpatient stays, the plan requires pre-approval. In 2024, MA insurers processed nearly 53 million prior authorization requests, of which 4.1 million (7.7%) were denied outright.⁵

Prior authorization denials don't necessarily mean you don't get the care — you can appeal, and approval rates on appeal are high. But every denial introduces delay. If you need an MRI before an oncology consultation, a denial that takes 7–10 days to resolve means a 7–10 day delay in your care chain. For routine care, this matters little. For time-sensitive diagnoses, it can matter a great deal.

Starting in 2026, MA plans must respond to prior authorization requests within 7 calendar days (down from 14 days).⁵ This is a meaningful improvement for enrollees, though the response clock starts from when the plan deems your request complete — not when you submit it.

The one-way door: guaranteed issue and the 12-month trial right

The single most consequential fact about choosing Medicare Advantage at 65 is what happens if you want to switch back later. Your Medigap Open Enrollment Period — the 6-month window after you're both 65+ and enrolled in Part B — gives you guaranteed issue rights to any Medigap plan at standard rates, with no medical underwriting. Enroll in Medicare Advantage at 65 instead of Medigap, and that window passes unused.

If you later try to switch from MA to Original Medicare + Medigap, most states allow Medigap insurers to require full medical underwriting. They can deny your application or charge substantially higher premiums based on your current health. The exceptions: New York, Connecticut, Maine, and Massachusetts have year-round guaranteed issue for Medigap. Most other states do not.

There is one safety valve: a one-time 12-month trial right. If you enroll in Medicare Advantage for the first time and decide to switch back to Original Medicare within 12 months, you have federal guaranteed issue rights to Medigap. This right is one-time and expires after 12 months. After it lapses, you face medical underwriting in most states.

The practical implication: choosing MA at 65 is not freely reversible. Someone who develops a serious illness at 70 and wants to switch to Medigap — for its unrestricted provider access and predictable cost-sharing — may find it impossible or cost-prohibitive. For healthy people with no specialist needs today, this risk is abstract. For anyone with pre-existing conditions or complex health management needs, it is concrete. See our Medigap guaranteed issue guide for the full list of federal GI situations and birthday-rule states.

Annual Notice of Change: MA plans change every year

Medicare Advantage plans are not locked in for life. Every year, plans can change premiums, cost-sharing (copays and coinsurance), network (which doctors and hospitals), and covered drug formularies. CMS requires plans to send an Annual Notice of Change (ANOC) by September 30 each year explaining every material change effective January 1.

Reading the ANOC matters — especially your drug formulary and the network status of your key providers. It's common for people to stay in the same MA plan for years without noticing that their specialist was dropped from the network or their specialty drug moved to a tier requiring prior authorization. The Medicare Annual Enrollment Period (AEP) runs October 15 through December 7 and lets you switch MA plans or return to Original Medicare for January 1 coverage. There is also an MA Open Enrollment Period (MA-OEP) from January 1 through March 31 that lets you make one more change if needed.

Medicare Advantage star ratings

CMS rates every Medicare Advantage plan on a 1- to 5-star scale based on quality measures: preventive care rates, chronic condition management, member experience, customer service, and appeals handling. 5-star plans earn the right to be enrolled year-round (not just during AEP). 4-star plans generally offer stable quality. Plans rated 3 stars or below may be restricted or terminated by CMS over time.

Star ratings are published annually at Medicare.gov's Plan Finder. A plan's star rating can change year to year — a plan that rated 4.5 stars when you enrolled may drop to 3 stars two years later if quality deteriorates. Check your plan's current star rating each year before the AEP deadline, not just when you first enrolled.

Supplemental benefits MA plans can offer

Medicare Advantage plans can offer benefits not available in Original Medicare, including routine dental, vision, and hearing coverage; fitness memberships (SilverSneakers); over-the-counter drug allowances; and transportation to medical appointments. These benefits vary widely by plan and area and are often the deciding factor for beneficiaries comparing MA options.

A word of caution: supplemental benefit values are often overstated in marketing materials. A $1,500 dental benefit with a $50 copay per cleaning and extensive exclusions for major work is not the same as $1,500 in dental coverage. Evaluate the actual coverage terms, not the headline number, before weighting supplemental benefits heavily in your decision.

Who tends to choose MA — and who tends to choose Medigap

Medicare Advantage tends to work best for:

• People in excellent health with minimal specialist needs and a preference for lower out-of-pocket predictability in most years
• People in areas with strong MA plan networks and consistently high-rated plans
• People who value supplemental benefits (dental, vision) and find the available plans genuinely useful
• People whose income is below IRMAA thresholds, for whom the $0-premium MA option creates a real cost saving versus Medigap premiums

Original Medicare + Medigap tends to make more sense for:

• People with existing specialist relationships, complex conditions, or anticipated high utilization
• People who travel frequently or split time between states (Medigap is national, MA networks are local)
• People who strongly value unrestricted provider access and no prior authorization delays
• High-income retirees already paying significant IRMAA surcharges: the MA plan's $0 premium yields little marginal saving compared to Medigap premiums, while Original Medicare + Medigap provides superior protection in high-utilization years

The tradeoff is not "free MA vs. expensive Medigap." It's predictable Medigap premiums with no cost-sharing vs. lower MA premiums with network restrictions, prior auth, and potential OOP exposure. Use our Medicare Advantage vs. Medigap cost comparison to run the numbers for your specific situation.

How to compare Medicare Advantage plans

1. Medicare Plan Finder (medicare.gov/plan-compare): The official CMS tool. Enter your zip code, expected drug list, and preferred doctors to see plans available to you, estimated annual costs, and star ratings.
2. Check your current doctors: Verify your primary care physician, specialists, and preferred hospital are in-network under each plan you're considering — not just in the general network search, but confirmed by calling the provider's billing office.
3. Check your drug formulary: If you take specialty or expensive medications, verify they're covered on the plan's formulary, which tier they're on, and whether prior authorization is required.
4. Read the Summary of Benefits: Don't rely on the sales brochure. The official Summary of Benefits lists the exact copays, coinsurance, and prior authorization requirements for each service category.
5. Look at star ratings: Prefer 4+ star plans when available in your area. Plan stability and quality management matter for the long term, not just first-year costs.

1. KFF, "Medicare Advantage 2026 Spotlight: A First Look at Plan Offerings" (2025) — 35.4 million MA enrollees in 2026; KFF, "Medicare Advantage in 2025: Enrollment Update and Key Trends" — 34 million / 54% in 2025. Available at kff.org/medicare.
2. KFF, "Medicare Advantage in 2025: Premiums, Out-of-Pocket Limits, Supplemental Benefits, and Prior Authorization" — plan type enrollment shares: HMO 54%, local PPO 45%, regional PPO 1%. Available at kff.org.
3. CMS, Medicare Advantage 2026 fact sheets and NCOA — $9,250 in-network OOP maximum for 2026 (reduced from $9,350 in 2025); average plan OOP limit ~$6,074. CMS, "Medicare Advantage and Medicare Prescription Drug Programs Expected to Remain Stable in 2026." See also NCOA: Out-of-Pocket Medicare Costs 2026.
4. Inflation Reduction Act of 2022, Pub. L. 117-169, § 11201 — establishes $2,000 Part D OOP cap (effective 2025, adjusted to $2,100 for 2026). CMS, "2026 Medicare Part D Prescription Drug Coverage." See also Kiplinger: 10 Medicare Changes in 2026.
5. KFF, "Medicare Advantage Insurers Made Nearly 53 Million Prior Authorization Determinations in 2024" (2025) — 53M determinations, 7.7% initial denial rate. CMS 2026 final rule — prior authorization response time reduced from 14 to 7 calendar days effective January 1, 2026. Available at kff.org.

Medicare Advantage enrollment, OOP limits, and prior authorization data verified May 2026. Part B IRMAA tiers per CMS "2026 Medicare Parts A & B Premiums and Deductibles" fact sheet (November 2025), based on 2024 MAGI.