Part C · The private-plan alternative
Medicare Advantage plans, explained without the sales pitch
Medicare Advantage is the private alternative to Original Medicare, offered by insurers approved by Medicare. A Medicare Advantage plan includes Part A and Part B, usually adds Part D drug coverage, and layers on a network, an annual out-of-pocket cap, and extra benefits. This page explains how it works, who it suits, and the trade-offs that matter.
What Medicare Advantage actually is
When you join a Medicare Advantage plan you stay in the Medicare program. What changes is who administers your benefits and how you access care.
The plan must cover everything Original Medicare covers. Beyond that baseline it sets its own network, its own copays, its own rules about referrals and prior authorization, and its own extra benefits.
You keep paying your Part B premium. The plan may charge an additional premium, though many charge none. A zero-premium plan is not free coverage; the cost simply appears as copays when you use care.
The cap that Original Medicare does not have
Every Medicare Advantage plan must set an annual limit on what you pay out of pocket for in-network Part A and Part B services. Once you reach it, the plan covers those services fully for the rest of the year.
Original Medicare on its own has no such ceiling, which is the main reason people pair it with a Medigap policy. The maximum a plan may set is established by Medicare each year and published at Medicare.gov.
The plan types, and how they differ
HMO
You choose a primary care physician and generally stay in network. Referrals are often required to see a specialist. Out-of-network care is usually not covered except in an emergency. Premiums tend to be lowest here.
PPO
You may go out of network at a higher cost, and referrals are typically not required. More flexibility, usually a higher premium and higher cost sharing.
HMO-POS
An HMO with a point-of-service option that allows certain out-of-network services at a defined cost.
Private Fee-for-Service
Less common. The plan sets its own payment terms and providers may choose whether to accept them, appointment by appointment.
Special Needs Plans
Restricted to people who meet a specific condition, with benefits built around it.
Dual Eligible Special Needs Plans
For people with both Medicare and Medicaid. These carry the broadest extra benefits. See our dual eligibility page.
Chronic Condition Special Needs Plans
For people with a qualifying chronic illness, confirmed by a physician.
Institutional Special Needs Plans
For people in a nursing facility or receiving an equivalent level of care at home.
Who Medicare Advantage tends to suit
No structure is better in the abstract. It depends on how you use care and how much you travel.
Often a good fit
People whose doctors are already in a strong local network, who value a lower premium and extra benefits, and who mostly receive care close to home.
Often a poor fit
People who travel or live part of the year in another state, who see specialists at centers that sit outside plan networks, or who want to avoid prior authorization.
The trade-offs worth understanding
Networks
This is the one that costs people the most. A plan is only as good as its network on the day you need care, and networks change every year. Confirm each of your doctors for the coming plan year, and confirm with the office rather than relying on the directory.
Prior authorization
Many Medicare Advantage plans require approval before certain procedures, imaging, or skilled nursing stays. Original Medicare rarely does. If you have a condition likely to need frequent authorizations, ask specifically how the plan handles them.
Referrals
HMO plans commonly require a referral before you see a specialist. That is a workflow difference more than a cost difference, but it frustrates people who are used to booking directly.
You cannot use Medigap alongside it
A Medigap policy cannot pay Medicare Advantage cost sharing. Choosing a Medicare Advantage plan means giving up that option while you are enrolled, and returning to Medigap later may require medical underwriting depending on your state and timing.
Extra benefits on Medicare Advantage plans
Dental, vision, hearing, transportation, fitness, over-the-counter allowances and Part B premium reductions are all plan-level additions rather than Medicare benefits.
They are real and they can be worth meaningful money. They are also the last thing to compare, because a plan chosen for its dental allowance that drops your cardiologist is a bad trade.
Our extra benefits page explains how to value them, with detail on flex cards and OTC allowances and the Part B give back.
When you can join or change a Medicare Advantage plan
Initial Enrollment Period
Seven months around your 65th birthday: three months before, your birthday month, and three months after.
Annual Enrollment Period
October 15 through December 7. Join, switch, or drop a plan, effective January 1.
Medicare Advantage Open Enrollment
January 1 through March 31. If you are already enrolled, you get one opportunity to change plans or return to Original Medicare.
Special Enrollment Periods
Triggered by moving out of the plan service area, losing employer coverage, qualifying for Medicaid, or a plan leaving your area.
The trial right most people miss
If you join a Medicare Advantage plan when you first become eligible at 65 and decide within the first twelve months that it is not right, you generally have a guaranteed right to switch to Original Medicare and buy a Medigap policy without medical underwriting.
That twelve-month trial right is one of the most valuable and least known protections in Medicare. Our turning 65 page covers it alongside the other first-year decisions.
How to compare Medicare Advantage plans properly
Four steps, in this order. The first two settle most of the decision.
- Confirm every doctor and specialist you intend to keep is in network for the coming plan year
- Check every prescription with its exact dose against the plan formulary and note the tier
- Compare the copays for services you actually use and the annual maximum out-of-pocket
- Only then weigh the extra benefits, valuing each at what you would realistically use
Read the Annual Notice of Change your plan mails each fall. It lists exactly what is changing for January, and it is the document that tells you whether staying is still the right call.
You can review every plan in your ZIP code at Medicare.gov Plan Compare, and get free unbiased counseling through your State Health Insurance Assistance Program.
Ask before you decide
Frequently asked questions about Medicare Advantage
Am I still in Medicare with a Medicare Advantage plan?
Yes. You remain in the Medicare program and keep paying your Part B premium. A private plan approved by Medicare administers your benefits.
Can I keep my doctors?
Only if they participate in that plan’s network for the coming year. We check your specific providers before you enroll and encourage confirming with each office directly.
Can I use a Medigap policy with Medicare Advantage?
No. Medigap cannot pay Medicare Advantage cost sharing. They are alternative structures.
What happens if I travel?
Emergency and urgent care are covered anywhere in the country. Routine care outside the plan service area generally is not, which matters if you spend months elsewhere.
Is a zero-premium plan really free?
No. You still pay your Part B premium, and the plan’s costs appear as copays and cost sharing when you use care. Compare the out-of-pocket maximum, not the premium.
Does your help cost anything?
No additional fee is charged to you for O’Neal Insurance Group’s guidance. Agents may be compensated by an insurance carrier when an enrollment occurs.
Important: Plan availability, benefits, networks, prior authorization rules and costs vary by plan, by county and by year. Nothing on this page is an offer of coverage or a statement of what any specific plan provides. We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your State Health Insurance Assistance Program to get information on all of your options.
Official resource
How big Medicare Advantage has become, and what that means for you
This is no longer the alternative option. MedPAC reported that 55 percent of people enrolled in both Part A and Part B were in a private plan as of July 2025 — roughly 34.9 million people. CMS, counting every Medicare enrollee including those with Part A only, projected about 48 percent for 2026.
Both numbers are correct and they get quoted interchangeably, which is why you will see the share of people in Medicare Advantage reported anywhere between 48 and 55 percent depending on who is writing. The denominator is what differs, not the facts.
For 2026 there are roughly 5,600 plans nationally, slightly fewer than the year before, and the average monthly premium fell to about $14.00 from $16.40. More than 99 percent of beneficiaries can access at least one plan and 97 percent can choose from ten or more.
Scale cuts both ways. It means genuine competition and real benefits in most counties. It also means a crowded field where the differences that matter are buried in documents nobody reads, and where the plan advertised hardest is not reliably the one that fits.
Where the extra benefits are funded from
A reasonable question about any $0-premium plan is how it pays for dental, hearing and a fitness membership. The answer is that Medicare pays private plans more per enrollee than it would spend on the same person in Original Medicare — MedPAC projected that gap at about 14 percent, or roughly $76 billion, for 2026.
That is not an argument against these plans. It is the mechanism that funds the extras, and for a great many people the extras are real and worth having. It is an argument for treating a $0 premium as the beginning of the comparison rather than the end of it.
The 2026 out-of-pocket limits, in actual numbers
Every plan must cap what you spend in a year, and CMS sets the ceiling on that cap. For 2026 the mandatory in-network limit is $9,250, and PPOs must cap combined in-network and out-of-network spending at $13,900.
Those are maximums, not typical figures. Plans routinely set theirs lower, and the difference between a plan capping at $4,500 and one capping at $9,250 is nearly five thousand dollars in the year you actually need it. That single number deserves more weight than the premium, the dental allowance and the fitness benefit combined.
Check what the cap counts, too. In-network and out-of-network limits are tracked separately on a PPO, and Part D drug spending sits outside the medical cap entirely under its own $2,100 annual ceiling for 2026.
Prior authorization, with the real figures
This is the most argued-about feature of Medicare Advantage and the most carelessly reported, in both directions. CMS data shows private plans handled roughly 53 million prior authorization determinations in 2024, about 1.7 per enrollee. Traditional Medicare completed just over 625,000 reviews, around two per hundred beneficiaries.
Here is the part usually left out. Private plans denied 7.7 percent of the requests they reviewed. Traditional Medicare denied 22.9 percent of the far smaller number it reviewed. So the honest statement is not that Original Medicare denies less often — it is that Original Medicare subjects far fewer services to review in the first place.
Of the denials issued by private plans, only about 11.5 percent were appealed. Of those appealed, roughly 80.7 percent were overturned. A high overturn rate on a small number of appeals does not mean most denials are wrong; it means appealing is usually worth the effort, and most people never try.
The rules tightened for 2026
A federal interoperability rule finalised in 2024 now requires affected plans to decide expedited prior authorization requests within 72 hours and standard requests within seven calendar days, to give a specific reason for every denial rather than a generic code, and to publish their prior authorization statistics annually. Broader data-sharing requirements follow in 2027.
Original Medicare is not covered by that rule, because its own prior authorization program is far smaller. If a plan you are considering has published its metrics, they are worth ten minutes of your time.
Star ratings, and why they show up in next year’s benefits
CMS rates every contract from one to five stars each autumn using around forty measures: clinical quality, member experience surveys, complaint volumes, appeals handling and customer service. The rating attaches to a contract number, not to a company, so the same insurer can hold four and a half stars in one state and three in another.
Ratings are not just a quality signal. They feed the bonus payments that fund supplemental benefits, which is why a rating drop tends to surface as a thinner benefit package a year or two later rather than immediately. When you see a plan quietly reduce its dental allowance, the cause is usually two years upstream.
Three measures inside the overall score are worth looking at directly, because they capture what people actually complain about: complaints about the health plan, members choosing to leave, and how quickly appeals are handled. A plan can carry a respectable overall rating while doing poorly on precisely the thing that would matter to you.
One caution about advertising. A five-star plan carries a Special Enrollment Period that lets you join outside the usual windows, which is a genuine advantage — but ratings are reset every autumn and marketing material outlives them. A plan that was five stars two years ago may not be now, and the enrollment right goes with the current rating rather than the brochure.
The one habit that saves the most money
Networks, formularies, star ratings and benefit packages are all reset every January, and your plan mails you an Annual Notice of Change each autumn listing exactly what is different. It is the least read and most useful post you receive all year. Reviewing Medicare Advantage options annually rather than letting a plan roll over is the single habit that separates people who are well covered from people who are merely still enrolled.
Check the source, then ask for personal help
Educational information is general. A licensed agent can help with plan comparisons; agents do not provide medical, legal, or official eligibility advice.
Personal guidance · No additional fee
See which Medicare Advantage plans keep your doctors
We check your providers and prescriptions against every plan available in your county before talking about anything else.
Medicare reference charts
The charts below cover the ground most questions start from.
