UnitedHealthcare Medicare Advantage Review 2027: Costs, Plans, and Honest Pros & Cons

This article is for general educational purposes only and is not insurance or medical advice. We are not affiliated with the U.S. government, Medicare, or UnitedHealthcare. For official information, visit Medicare.gov or call 1-800-MEDICARE. See our Medical & Financial Disclaimer for details.

UnitedHealth Group is the largest Medicare Advantage insurer in the country by a wide margin — 9.3 million enrollees, 26% of the entire market. It is also, for the first time in a long while, getting smaller. That combination is the most useful thing to understand about UnitedHealthcare going into 2027, and it’s the part most reviews leave out. The second most useful thing is new for 2027: the star-rating lead it held a year ago has gone.

Where UnitedHealthcare Actually Sits

Parent organization	Share of Medicare Advantage enrollment, 2026
UnitedHealth Group	26% — 9.3 million enrollees, down from 29% in 2025
Humana	20% — 7 million enrollees, up from 17%
CVS Health (Aetna)	12%
Kaiser Foundation Health Plan	6%
Elevance Health	5%

Two things in that table matter more than the ranking itself.

First, UnitedHealth’s share fell three points in a year while Humana’s rose three. Between them they still hold 46% of all Medicare Advantage enrollment, the same combined share as 2025 — but the balance inside that half of the market shifted. A carrier that is contracting is a carrier making decisions about which counties and which products it wants to keep, and those decisions land on members as withdrawn plans and reshaped networks.

Second, and more useful when you’re deciding: KFF found that in 889 counties — 28% of all counties — UnitedHealth and Humana together account for at least 75% of Medicare Advantage enrollment. National choice statistics don’t describe those places. If you live in one of them, “compare the market” may in practice mean comparing two companies.

What 852 Plans Look Like Up Close

Market share describes how many people chose a company. It says nothing about what the company is selling. So we counted every UnitedHealthcare plan in the CMS plan file for 2027, matched each one to the 2027 star rating CMS published on October 8, 2026, and set the result against the market as a whole and against UnitedHealthcare’s own lineup a year earlier. The method is at the end of this article.

From the CMS plan file	UnitedHealthcare 2027	All Medicare Advantage plans 2027	UnitedHealthcare 2026
Distinct plans on sale	852	5,522	846
Counties served	2,791 of 3,131 (89%)	3,131	2,787 of 3,147 (89%)
Rated plans at 4 stars or better	62.1%	61.2%	79.5%
Mean overall star rating	3.84	3.86	4.05
Plans with no monthly premium at all	64.0%	69.7%	51.0%
Median in-network out-of-pocket limit	$7,150	$7,100	$6,700
Plans capped at the legal maximum ($9,850 in 2027, $9,250 in 2026)	30.8%	28.2%	25.7%
Special needs plans	362	1,969	322

The reach is real: 89% of counties in the country, more than any other insurer, which is why there is usually a UnitedHealthcare plan on your list whether or not you went looking for one.

The quality story is where 2027 changes things. A year ago four fifths of UnitedHealthcare’s rated plans reached four stars, against 60.5% of plans generally, and it was the best-rated of the national giants. On the 2027 ratings that lead has gone: 62.1% of its rated plans reach four stars against 61.2% market-wide, and its mean rating of 3.84 sits just below the market’s 3.86. Humana, which trailed it last year, now has 93.6% of its rated plans at four stars or better. None of this makes UnitedHealthcare a bad choice — an average insurer is still an average insurer — but anyone relying on last year’s reputation for quality should look at this year’s number on the plan itself.

It is also slightly weaker than average on price and exposure. 64.0% of its 2027 plans charge nothing beyond Part B, against 69.7% market-wide and 78.5% at Humana, and its median out-of-pocket limit is $7,150 against a market median of $7,100. On the share of plans left at the new legal ceiling of $9,850 it is a little worse than the market, 30.8% against 28.2%, though still below the 35.0% that Aetna leaves there. Last year this review described a trade: the insurer that grew fastest was the cheaper one, and the one that shrank was the better rated. For 2027 that trade has disappeared at plan level — Humana is now both cheaper and better rated on average. Averages are not your plan, and the plan in your county may buck the pattern, but it is the actual starting point in front of you, and it is not the one the advertising describes. Our UnitedHealthcare versus Humana comparison puts the two side by side.

One structural difference worth noting: UnitedHealthcare is built around HMO-POS plans (310 of them in 2027) more than PPOs (167, down from 201), while Humana is the PPO insurer among the giants. If out-of-network flexibility matters to you, that difference is more consequential than either company’s slogan.

What Scale Buys You, and What It Doesn’t

UnitedHealthcare contracts with independent doctors and hospitals rather than employing them, which is the opposite of the Kaiser Permanente model. That’s why it can operate in most of the country while Kaiser can’t, and it’s the structural reason its networks are large.

What a large national network does not tell you is whether your own doctor is in the network of the specific plan you’d join. Those are different questions, and the gap between them is where people get caught. A carrier contracting with a million providers nationally and a plan contracting with the cardiology group you use in your county are unrelated facts. Only the second one affects you.

The same applies to plan type. UnitedHealthcare sells HMO, HMO-POS, PPO and PFFS plans, but not every type in every state, and the mix it offers where you live may be narrower than its national catalog suggests. Check what’s actually sold at your address rather than what the company offers somewhere.

The AARP Question

Many UnitedHealthcare plans carry AARP branding, and this causes more confusion than any other thing about the company. AARP is not an insurer. It licenses its name to UnitedHealthcare, which underwrites and administers the coverage.

Worth knowing rather than worrying about: an AARP-branded plan is a UnitedHealthcare plan, and should be judged as one. The branding tells you about a commercial arrangement, not about the plan’s network, its out-of-pocket maximum, or its formulary — which are the things that will determine what your year costs.

On Star Ratings, and Why We Won’t Quote You a Company Average

You’ll see UnitedHealthcare’s quality summarized as a single company-wide number. Treat those with care, because CMS rates contracts, not companies. A large insurer holds many contracts, and they do not all score alike. A company average is an average of things you can’t buy, weighted in ways nobody explains.

For context on where any rating sits: the enrollment-weighted average across all Medicare Advantage drug plans for 2027 is 3.99, and about 71% of enrollees are in contracts that will have four stars or more in 2027. A four-star plan is solidly above the middle; it is not exceptional.

The rating that applies to you is the one on the contract behind the specific plan in your county, and it’s published by CMS in its Part C and D performance data and shown on the Medicare Plan Finder next to each plan. That number is worth five minutes. A company average isn’t worth any.

What to Compare, With the 2027 Benchmarks

Whichever UnitedHealthcare plan you’re looking at, these are the market-wide figures to hold it against. A plan is good or bad relative to these, not relative to its own marketing.

What to check	Benchmark
Monthly plan premium	CMS projects an average of $12 a month for 2027, down from $14 in 2026. In our count of the 2027 plan file, 69.7% of plans charge nothing beyond Part B
In-network out-of-pocket maximum	Legal ceiling $9,850 for 2027, up from $9,250. Median across 2027 plans in our count: $7,100. KFF’s enrollment-weighted average for 2026 was $5,421; its 2027 figure is not out yet
PPO combined limit	For 2026, up to $13,900 by law and $9,825 on average — the second ceiling HMOs don’t have
Star rating	2027 average 3.99; about 71% of enrollees are in contracts rated 4 stars or better
Drug costs	Capped at $2,400 a year for 2027, up from $2,100, separate from the medical maximum

Run the plan you’re considering against every row. If its out-of-pocket maximum sits well above the $7,100 median, that’s a question to ask, whatever the premium says.

Extra Benefits: Read Them as Rebate Spending

UnitedHealthcare markets several named programs — a fitness benefit, a single prepaid card covering eligible food and other allowances, and dental, vision and hearing coverage on many plans. These are real, and for some people they’re genuinely valuable.

The useful way to read them is as choices about rebate money. As covered in our guide to how Medicare Advantage is funded, plans bidding below their county benchmark must spend rebate dollars on extra benefits, lower cost sharing, or a lower premium. A rich benefits list isn’t generosity — it’s where that plan put money it was obliged to spend somewhere. Another plan put the same money into a lower out-of-pocket maximum.

So value them against what you’d actually use. A gym membership you won’t use and a grocery card you’d struggle to spend are worth less than $1,000 off your out-of-pocket ceiling, even though the first two are what the advertising leads with.

Who UnitedHealthcare Suits

Its structural advantages are real and they favor particular situations. Contracting broadly with independent providers means that in most counties there is at least one UnitedHealthcare plan to compare, which is not true of every carrier. If you split time between states, a carrier with a presence in most of the country is a sensible place to start looking — though the plan’s own rules, not the carrier’s footprint, decide what’s covered when you travel.

It suits you less well if you live in one of those 889 concentrated counties and you’re treating a UnitedHealthcare plan as the obvious default. Where two companies hold three-quarters of a market, the plan you were going to pick anyway deserves more scrutiny, not less.

Frequently Asked Questions

Is UnitedHealthcare the same as AARP? No. AARP licenses its name to UnitedHealthcare, which is the insurer underwriting the plan. An AARP-branded Medicare Advantage plan is a UnitedHealthcare plan.

Is UnitedHealthcare losing members? Its share of Medicare Advantage enrollment fell from 29% in 2025 to 26% in 2026, or 9.3 million people, while Humana’s rose from 17% to 20%. Between them they still hold 46% of the market.

What’s UnitedHealthcare’s star rating? There isn’t one. CMS rates contracts rather than companies, and a large insurer holds many contracts with different scores. Look up the rating on the specific plan in your county — for reference, the 2027 average across all Medicare Advantage drug plans is 3.99. At plan level, 62.1% of UnitedHealthcare’s rated 2027 plans score four stars or better, against 79.5% a year earlier.

Does the biggest network mean my doctor is covered? No. National network size and your plan’s local network are different things. Call your doctor’s office and ask whether they take the specific plan, by name.

Are UnitedHealthcare’s extra benefits better than other carriers’? They’re extensive, but extra benefits are funded from rebate dollars every plan must spend somewhere. Compare what a plan gives you in benefits against what it costs you in out-of-pocket exposure, rather than comparing benefit lists on their own.

Bottom Line

UnitedHealthcare is the largest Medicare Advantage insurer in the country and it lost three points of market share in a year. Both facts are worth carrying into your decision, because they say the same thing: this is a company actively reshaping where it operates and what it sells.

Its genuine advantage is reach — in most counties you’ll have a UnitedHealthcare plan available to compare. That is the beginning of the analysis, not the end of it. Check the contract’s star rating rather than any company average, hold the plan’s out-of-pocket maximum against the $7,100 median across 2027 plans (why this site quotes two different market figures), and confirm your own doctors by telephone rather than by directory.

And if you’re in one of the 889 counties where two insurers hold three-quarters of the enrollment, look hardest of all — that’s where the least competitive pressure exists.

Compare the exact UnitedHealthcare plans available in your ZIP code using the official Medicare Plan Finder, or speak with your local State Health Insurance Assistance Program (SHIP) for free, unbiased guidance.

Sources

• Medicare Advantage in 2026: Enrollment Update and Key Trends — KFF. Source for UnitedHealth Group’s 26% share and 9.3 million enrollees (down from 29% in 2025), Humana’s 20% and 7 million (up from 17%), the combined 46%, the CVS Health, Kaiser and Elevance shares, and the 889 counties where two organizations hold at least 75% of enrollment.
• 2027 Medicare Advantage and Part D Star Ratings Fact Sheet — Centers for Medicare & Medicaid Services, October 8, 2026. Source for the 3.99 enrollment-weighted average star rating and the approximately 71% of enrollees in contracts that will have four stars or more in 2027.
• Medicare Advantage in 2026: Premiums, Out-of-Pocket Limits, Supplemental Benefits and Prior Authorization — KFF. Source for the 2026 statutory limits of $9,250 and $13,900, the $5,421 enrollment-weighted average and the $9,825 average combined PPO limit.
• Medicare Advantage 2026 Spotlight: A First Look at Plan Premiums and Benefits — KFF. Source for the legal requirement that rebate dollars fund extra benefits, reduced cost sharing or a lower premium.
• Medicare Advantage and Medicare Prescription Drug Programs Expected to Remain Stable in 2026 — Centers for Medicare & Medicaid Services. Source for the $14.00 average plan premium in 2026.
• Medicare Advantage and Medicare Prescription Drug Programs Expected to Remain Stable in 2027 — Centers for Medicare & Medicaid Services, September 28, 2026. Source for the projected $12 average plan premium in 2027.
• Final CY 2026 Part D Redesign Program Instructions — Centers for Medicare & Medicaid Services. Source for the $2,100 annual out-of-pocket cap on prescription drugs.
• CY2027 and CY2026 Medicare Advantage and Part D Landscape files — Centers for Medicare & Medicaid Services, September 2026 versions. Source for the plan counts, county coverage, premium shares, out-of-pocket limits, the $9,850 legal ceiling and $2,400 drug cap for 2027, and plan-type mix. We kept the MA, MA-PD and SNP categories, excluded stand-alone Part D plans, Cost plans and employer plans, and reduced each file to one entry per distinct plan nationally — 5,522 plans for 2027, 852 of them UnitedHealthcare’s, and 5,553 for 2026, 846 of them UnitedHealthcare’s. All calculations from the files are our own.
• 2027 Star Ratings Data Tables — Centers for Medicare & Medicaid Services, published October 8, 2026. Source for every 2027 plan-level star figure: we matched each plan to the overall rating of its contract. The 2026 star figures use the ratings carried in the 2026 Landscape file. Percentages are shares of plans, not of enrollment, which is why the plan-level star figures differ from the enrollment-weighted CMS average quoted above.

All figures on this page were checked against the sources above on October 12, 2026. The plan-level figures are our own analysis of the CMS Landscape files and star rating tables, by the method set out in the sources.

Disclaimer: Figures mentioned in this article reflect 2027 and 2026 data from the Centers for Medicare & Medicaid Services (CMS) and KFF analysis, and vary by state, county and plan. Always confirm current details directly with Medicare.gov, 1-800-MEDICARE, or a licensed agent before making a decision.