A Medicare Advantage plan advertising a $0 monthly premium might sound like a great deal, especially if you’re retired and watching every dollar. But what happens when you need an MRI, spend several days in the hospital, or discover that your regular prescriptions cost more than expected? Suddenly, the plan that looked cheapest on paper may become one of your biggest monthly expenses.
With Medicare Open Enrollment beginning October 15, 2026, beneficiaries have an opportunity to compare coverage for 2027 before making a decision. Average Medicare Advantage premiums are projected to decrease by an average of 16.5% next year, from $14.37 to $12 per month. The projected premium decrease doesn’t guarantee that every Medicare Advantage enrollee will save money in 2027. Individual plans can change their deductibles, copayments, provider networks, and prescription drug coverage from one year to the next.
That being said, Medicare out-of-pocket costs can make a much bigger difference to your retirement budget than a few dollars saved on premiums. Here’s what deserves a closer look before you select or renew your coverage.
A $0 Premium Doesn’t Mean Free Healthcare
One of the biggest misconceptions about Medicare Advantage is that a $0 premium means you won’t have significant healthcare expenses. Beneficiaries generally must continue paying their Medicare Part B premium even when their Advantage plan charges nothing extra each month. For 2026, the standard Part B premium is $202.90 monthly, and the amount can change annually.
At the 2026 standard Part B rate of $202.90 per month, a retiree would pay $2,434.80 over 12 months, even with a Medicare Advantage plan charging no additional monthly premium. Some beneficiaries pay more because of their income, while others qualify for assistance or plans that reduce their Part B premium. The important distinction is that a $0 Medicare Advantage premium doesn’t eliminate the underlying cost of Medicare coverage. Before choosing a plan, calculate the full annual premium cost rather than focusing exclusively on the amount advertised by the insurance company.
Deductibles Can Change What You Pay Early in the Year
A deductible is the amount you must pay for certain covered services before your insurance begins sharing the cost. Some Medicare Advantage plans have separate medical and prescription drug deductibles, while others may charge little or nothing upfront for specific services. For 2027, the maximum permitted Medicare Part D deductible increases to $700, up from $615 in 2026, according to Medicare’s prescription drug cost guidance.
Imagine starting January with several expensive prescriptions and discovering that you must satisfy a deductible before receiving your usual cost-sharing arrangement. Comparing deductibles alongside premiums can help you estimate how much money you’ll need available during the first few months of the year.
Hospital Stays Can Create Unexpected Expenses
Hospital costs are another reason Medicare out-of-pocket costs deserve careful consideration during Open Enrollment. Medicare Advantage plans may charge daily copayments for inpatient hospital stays, meaning your expenses could increase with each covered day until the plan’s applicable cost-sharing rules change.
For example, a hypothetical plan charging $300 per day for the first five days would leave someone with a $1,500 hospital bill before considering other expenses. Cost-sharing varies among Medicare Advantage plans and differs from Original Medicare. Review your plan’s inpatient hospital benefits, observation-service charges, and applicable maximum out-of-pocket limit before assuming a low premium means affordable hospital care.
Specialist Visits and Medical Tests Can Add Up
Routine appointments may seem affordable until several specialists become part of your regular healthcare schedule. Someone managing diabetes, heart disease, or arthritis might see multiple doctors throughout the year while also needing laboratory tests, imaging, or physical therapy. A hypothetical $45 specialist copayment across two visits each month would total $1,080 annually, even before accounting for diagnostic testing.
The Medicare Plan Finder allows beneficiaries to compare plan costs and coverage, while individual plan documents explain specific copayments and coinsurance requirements. If you already know you’ll need ongoing treatment in 2027, estimate those visits and services before choosing a plan based on its monthly premium.
Prescription Drug Costs May Matter More Than Premium Savings
Prescription coverage can dramatically change the total cost of a Medicare plan, particularly for people taking several medications. The Medicare Part D program will have a $2,400 annual out-of-pocket threshold for covered prescription drugs in 2027, compared with $2,100 in 2026.
After reaching that threshold, beneficiaries enter catastrophic coverage and generally pay nothing out of pocket for covered Part D medications for the remainder of the calendar year. However, the threshold doesn’t include monthly premiums, and medications not covered by the plan may create additional expenses outside that protection. Enter your prescriptions, dosages, and preferred pharmacies into Medicare Plan Finder to compare estimated yearly costs rather than assuming the lowest-premium drug plan is automatically the cheapest.
Out-of-Network Care Can Change the Financial Picture
A Medicare Advantage plan may look affordable until you discover that your preferred physician or hospital isn’t included in its provider network. Many Medicare Advantage plans require beneficiaries to use participating providers for nonemergency care, while some offer out-of-network coverage at higher costs.
For example, a retiree who spends winters in another state might find that routine specialist appointments are more complicated or expensive away from home. Original Medicare generally allows beneficiaries to visit any doctor or hospital nationwide that accepts Medicare, although supplemental coverage and prescription needs still affect total expenses. Before enrolling, verify your physicians, hospitals, pharmacies, and travel-related coverage directly with the plan rather than relying solely on a provider directory.
The Maximum Out-of-Pocket Limit Deserves Special Attention
One of the most important numbers in a Medicare Advantage plan is its annual maximum out-of-pocket limit. This limit generally applies to covered Medicare Part A and Part B services, not monthly premiums, and prescription drug spending follows separate Part D rules. Once beneficiaries reach their plan’s applicable limit, the plan pays the covered medical service costs for the remainder of the year.
Consider two hypothetical Medicare Advantage plans available to the same retiree. Plan A has a $0 monthly premium and a $7,500 medical out-of-pocket maximum, while Plan B charges $40 monthly but has a $3,500 maximum. Plan B would cost $480 more in annual plan premiums, but it could provide substantially greater protection against covered medical expenses during a year involving hospitalization or extensive treatment.
That doesn’t automatically make Plan B the better choice, since provider networks, covered services, and individual health needs still matter. However, it demonstrates why retirees should compare their potential annual financial exposure rather than choosing a plan based on premiums alone.
Even if the plan with the lower limit charges a higher premium, its financial protection may be worth considering if you anticipate significant medical needs.
Extra Benefits May Not Be Worth What You Think
Dental, vision, hearing, transportation, and over-the-counter allowances can make Medicare Advantage plans attractive to retirees trying to stretch their budgets. However, these benefits frequently come with annual limits, provider restrictions, approved product lists, or specific eligibility requirements. Medicare Advantage plans may offer supplemental benefits beyond those available through Original Medicare.
A plan advertising $1,000 in dental benefits may provide less practical value if your preferred dentist isn’t participating or the services you need aren’t fully covered. Compare the benefits you’re likely to use against your expected Medicare out-of-pocket costs instead of assigning full dollar value to every advertised perk.
Don’t Ignore Your Annual Notice of Change
Before automatically renewing your Medicare Advantage coverage, review the Annual Notice of Change your plan sends each fall. This document explains changes taking effect in January, including premiums, deductibles, copayments, and other coverage details. For example, a plan that worked well in 2026 might charge more for specialist visits or move one of your prescriptions to a different cost-sharing tier in 2027.
Compare those changes with your actual healthcare spending over the past year rather than assuming your existing coverage remains the best value. Taking 30 minutes to review the notice could help you identify expenses that might otherwise catch you off guard after Open Enrollment ends.
The Cheapest Medicare Plan Is the One That Fits Your Healthcare Needs
When comparing Medicare coverage, the most useful question isn’t simply which plan has the lowest monthly premium. It’s how much you could realistically spend over an entire year based on your medications, medical appointments, preferred providers, and potential hospital expenses.
Beneficiaries should review their options during Medicare Open Enrollment, which runs from October 15 through December 7, 2026. Use the Medicare Plan Finder to compare available coverage, and consider free counseling through your State Health Insurance Assistance Program if the choices feel overwhelming.
Have you ever selected a Medicare plan because of its low premium, only to discover that copayments, prescriptions, or other Medicare out-of-pocket costs were higher than expected? Share your experience in the comments.
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