Medicare Part C, also known as Medicare Advantage, often has a $0 monthly plan premium, but it is not truly free. Even with a zero-premium plan, you still pay the standard Medicare Part B premium, and you’ll face copays, deductibles, and other cost-sharing when you actually use medical services. Understanding where the real costs hide is key to knowing what you’ll actually spend.
Why So Many Plans Advertise $0 Premiums
Medicare Advantage plans are run by private insurance companies that receive a set payment from the federal government for each enrollee. When insurers can deliver care for less than that government payment, they pocket a rebate. Many use part of that rebate to reduce or eliminate the monthly plan premium, which is why you see so many “$0 premium” plans advertised during open enrollment season.
CMS estimates the average monthly premium across all Medicare Advantage enrollees in 2025 is about $17, and that average includes the large number of people paying nothing at all. So while plenty of plans do charge a monthly premium, the majority of enrollees end up in plans where the plan-specific premium is $0.
The Part B Premium You Still Owe
Here’s the cost most people overlook: to enroll in any Medicare Advantage plan, you must already be enrolled in both Medicare Part A and Part B. Part A is premium-free for most people, but Part B is not. The standard Part B premium is deducted from your Social Security check every month regardless of which Medicare Advantage plan you choose. That premium applies on top of any plan-specific premium.
Some Medicare Advantage plans offer what’s called a “Give Back” benefit, which reimburses part or all of your Part B premium. This shows up as either a higher Social Security check or a reduced Part B bill. Not every plan offers this, and the amount varies. If you qualify, the first reimbursement can take up to two months to appear. The average rebate per enrollee in 2025 is around $188 per year, so while helpful, it rarely covers the entire Part B premium.
Cost-Sharing When You Use Care
The bigger source of real spending for most seniors isn’t the monthly premium. It’s what you pay each time you visit a doctor, get a test, or spend time in the hospital. Medicare Advantage plans use the same cost-sharing tools as other insurance: copays (a flat fee per visit), coinsurance (a percentage of the bill), and deductibles (an amount you pay before coverage kicks in). These vary widely from plan to plan and change every year.
A typical plan might charge $10 or $20 for a primary care visit but $40 or $50 for a specialist. Inpatient hospital stays often carry per-day copays that can run several hundred dollars. Diagnostic imaging, outpatient surgery, and skilled nursing care each come with their own cost-sharing amounts laid out in the plan’s Evidence of Coverage document. Two $0-premium plans in the same zip code can have dramatically different copay schedules, so comparing plans on premium alone gives you an incomplete picture.
Out-of-Pocket Limits Provide a Cap
One genuine advantage of Part C over Original Medicare is the annual out-of-pocket maximum. Original Medicare has no cap on what you can spend in a year, but every Medicare Advantage plan is required to set one. In 2025, federal rules cap these limits at $9,350 for in-network services and $14,000 when in-network and out-of-network costs are combined. Many plans set their actual limits well below these maximums.
Once you hit your plan’s limit, the plan pays 100% of covered services for the rest of the calendar year. This protection matters most in years when you face a major surgery or extended hospitalization. But reaching even a $5,000 or $6,000 cap means a significant bill for seniors on a fixed income, even if no monthly premium was charged.
Network Rules Affect Your Costs
Most Medicare Advantage plans are either HMOs or PPOs, and the type determines what happens if you see a doctor outside the plan’s network. HMO plans generally do not cover out-of-network care at all except in emergencies. If you see a provider who isn’t in the network, you pay the full cost yourself.
PPO plans allow out-of-network visits but charge higher copays and coinsurance for them. The gap between in-network and out-of-network out-of-pocket limits reflects this: up to $9,350 versus up to $14,000 in 2025. If your preferred doctors or nearby hospitals aren’t in a plan’s network, a $0-premium plan could end up costing more than a plan with a modest premium and a network that fits your needs.
Drug Coverage Adds Another Layer
Most Medicare Advantage plans bundle prescription drug coverage (Part D) into the plan. This is convenient but comes with its own costs. In 2026, no Medicare drug plan can charge a deductible higher than $615, though many set it lower or waive it entirely. Beyond the deductible, you’ll pay copays or coinsurance for each prescription, with costs varying by the drug’s tier. Generic medications are typically cheap, while specialty drugs can carry coinsurance of 25% or more.
Starting in 2025, a $2,000 annual cap on out-of-pocket drug spending applies across all Medicare drug plans, including those bundled into Advantage plans. This is a significant protection for seniors taking expensive medications, but it’s still a real cost that a $0-premium plan doesn’t eliminate.
What “Free” Actually Means
A $0-premium Medicare Advantage plan means you pay nothing extra each month beyond your Part B premium. It does not mean free healthcare. You’ll still pay your Part B premium, copays at the doctor’s office, coinsurance for hospital stays, and prescription drug costs. The true cost of any plan is the total of premiums plus the cost-sharing you’ll realistically use in a year.
If you’re generally healthy and rarely see specialists, a $0-premium plan with moderate copays can be genuinely affordable. If you manage chronic conditions, take multiple medications, or see several specialists, adding up the expected copays and drug costs often matters more than whether the premium line reads $0 or $25. The plan’s annual out-of-pocket limit, its drug formulary, and whether your doctors are in-network are all better predictors of your actual spending than the premium alone.