Medicare Part C, also called Medicare Advantage, is a private insurance alternative to Original Medicare that bundles Part A hospital coverage, Part B medical coverage, and usually Part D prescription drug coverage into a single plan sold by a private insurer approved by Medicare. In 2026, about 75% of Medicare Advantage enrollees with drug coverage pay no premium beyond the standard Part B premium, and every plan must cap yearly out-of-pocket spending, something Original Medicare does not do. Roughly half of all Medicare beneficiaries now choose a Part C plan instead of Original Medicare.
This guide walks through what Medicare Part C actually is, how it compares to Original Medicare, what it costs in 2026, who qualifies, and how to enroll or switch plans.
What Is Medicare Part C?
Medicare Part C is not a separate government program. It is a way to receive your Medicare benefits through a private insurance company instead of directly through the federal government. Insurers such as UnitedHealthcare, Humana, Aetna, and Cigna contract with Medicare (CMS) to offer these plans, which must cover everything Original Medicare covers, and most add extra benefits Original Medicare does not, like dental, vision, hearing, and sometimes a fitness or over-the-counter allowance.
Common plan types include:
- HMO (Health Maintenance Organization): You choose a primary care doctor and typically need referrals to see specialists. Care outside the network usually is not covered except emergencies.
- PPO (Preferred Provider Organization): More flexibility to see out-of-network providers, usually at a higher cost, and no referrals needed.
- PFFS (Private Fee-for-Service): The plan decides how much it pays providers and how much you owe.
- SNP (Special Needs Plan): Designed for people with specific chronic conditions, dual Medicare and Medicaid eligibility, or those in institutional care.
Medicare Part C vs. Original Medicare: Key Differences
| Feature | Original Medicare (Parts A & B) | Medicare Advantage (Part C) |
|---|
| Who administers it | Federal government directly | Private insurers approved by Medicare |
| Provider choice | Any provider nationwide who accepts Medicare | Usually limited to a plan network |
| Referrals needed | No | Often yes, for HMOs |
| Out-of-pocket maximum | None, spending can be unlimited | Required by law, federal cap of $9,250 in-network (up to $13,900 combined in-network and out-of-network for PPOs) for 2026 |
| Extra benefits (dental, vision, hearing) | Not included | Often included |
| Prescription drug coverage | Requires separate Part D plan | Usually bundled in (MAPD plans) |
| Medigap eligibility | Yes | No, cannot pair with a Medigap policy |
| Monthly premium | Standard Part B premium plus any Part D premium | Standard Part B premium plus plan premium (often $0) |
The tradeoff is straightforward: Original Medicare offers open access to any provider that accepts Medicare nationwide but has no cap on out-of-pocket costs unless you buy a supplemental Medigap policy. Medicare Advantage caps your annual spending and often adds extra benefits, but usually restricts you to a network and may require prior authorization for certain services.
What Does Medicare Part C Cost in 2026?
Costs vary significantly by plan, insurer, and county, but here is what the national picture looks like for 2026.
| Cost Item | 2026 Amount |
|---|
| Average Medicare Advantage supplemental premium | Approximately $14 to $15 per month (many plans have $0 premium) |
| Standard Part B premium (still required) | $202.90 per month |
| Part B annual deductible | $283 |
| Federal legal ceiling, in-network | $9,250 |
| Federal legal ceiling, combined in-network and out-of-network (PPO) | $13,900 |
| Average actual plan out-of-pocket maximum, in-network (not the legal ceiling) | Approximately $5,421 |
| Average actual plan out-of-pocket maximum, in and out-of-network combined (not the legal ceiling) | Approximately $9,825 |
| Part A deductible (per benefit period, still applies through most Advantage plans) | $1,736 |
Even though most Medicare Advantage plans advertise a $0 monthly premium, you still owe the standard Part B premium every month because Part C is built on top of Part A and Part B. Higher-income beneficiaries pay an income-related monthly adjustment amount (IRMAA) on top of the standard Part B premium, ranging up to $689.90 a month for 2026 depending on income.
The federal out-of-pocket ceiling is not the same number every plan actually charges, and it is worth knowing the difference between in-network and combined limits before you enroll. See our full breakdown at Medicare Advantage Out-of-Pocket Maximum 2027 for the year-by-year CMS figures, including why the 2026 cap actually dropped from 2025's $9,350.
Who Qualifies for Medicare Part C?
To enroll in a Medicare Advantage plan, you must:
- Be enrolled in both Medicare Part A and Part B.
- Live in the service area of a plan that is accepting new enrollees.
- Not have End-Stage Renal Disease at the time of enrollment in most cases, though recent rule changes have opened more Advantage options to people with ESRD.
There is no income limit or asset test for Medicare Part C itself. Eligibility is based on your existing Medicare enrollment and where you live, not your income. However, income does affect your Part B and Part D premiums separately through IRMAA surcharges.
If you receive Extra Help (the Part D low-income subsidy) or are dually eligible for Medicare and Medicaid, you may qualify for a Special Needs Plan (D-SNP) with additional cost protections and benefits tailored to that situation.
When Can You Enroll in Medicare Part C?
There are several windows during the year when you can enroll in or change a Medicare Advantage plan:
- Initial Enrollment Period (IEP): Seven months total, starting three months before the month you turn 65, including your birthday month, and ending three months after.
- Annual Enrollment Period (AEP): October 15 through December 7 every year. You can switch from Original Medicare to Advantage, switch between Advantage plans, or drop Advantage and return to Original Medicare. Changes take effect January 1.
- Medicare Advantage Open Enrollment Period (MA OEP): January 1 through March 31. If you are already in an Advantage plan, you can switch to a different Advantage plan or drop it and return to Original Medicare (with the option to add a Part D plan). You cannot switch from Original Medicare into an Advantage plan during this window.
- Special Enrollment Periods (SEP): Triggered by life events such as moving out of your plan's service area, losing employer coverage, or a plan leaving your area.
Missing these windows generally means waiting for the next one, so it helps to mark the dates and compare plans before AEP begins each fall.
How to Compare and Choose a Medicare Part C Plan
- List your doctors and medications. Confirm they are in-network and on the plan's drug formulary before enrolling.
- Check the star rating. Medicare rates plans on a 1 to 5 star scale each year. For 2026, CMS tightened the rating criteria, and 34 plans earned the top 5-star rating compared to just seven the year before, while the national average rating held at about 3.66 stars. Use the Medicare Plan Finder at medicare.gov to compare ratings in your area.
- Compare the out-of-pocket maximum. This is the single biggest financial protection Advantage plans offer over Original Medicare, so check it closely against your typical annual health spending.
- Look at extra benefits. Dental, vision, hearing, transportation, and over-the-counter allowances vary widely between plans even within the same insurer.
- Check prior authorization rules. Many Advantage plans require prior approval for certain services, imaging, or hospital stays. Ask how often the plan denies requests and what the appeal process looks like.
- Confirm network size. HMOs generally cost less but limit you to a narrower network. PPOs cost more but offer flexibility to see out-of-network providers.
How to Enroll in Medicare Part C
- Confirm you have Parts A and B. You must already be enrolled or enroll at the same time.
- Compare plans in your area using the Medicare Plan Finder at medicare.gov, by calling 1-800-MEDICARE, or by working with a licensed insurance broker who does not charge a fee (brokers are paid by the insurer).
- Enroll online, by phone, or through the plan's own application. You can also enroll by contacting the insurer directly during an eligible enrollment period.
- Confirm your effective date. Coverage typically starts the month after you enroll during your Initial Enrollment Period, or January 1 if you enroll during AEP.
- Get your new plan ID card and start using it on your effective date. Keep your red, white, and blue Original Medicare card as well, since you may need it for certain records.
Frequently Asked Questions
Is Medicare Part C the same as Medicare Advantage?
Yes. Medicare Part C and Medicare Advantage are the same program. "Part C" is the official statutory name; "Medicare Advantage" is the marketing name used by CMS and insurers.
Does Medicare Part C cost more than Original Medicare?
It depends. Most Medicare Advantage plans have a $0 or low monthly premium beyond the standard Part B premium, and they cap your annual out-of-pocket spending, which Original Medicare does not. However, you may pay more in copays for specific services, and if you need extensive out-of-network care, Original Medicare paired with a Medigap policy could end up cheaper.
Can I switch from Medicare Part C back to Original Medicare?
Yes. You can switch during the Annual Enrollment Period (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31) if you are already enrolled in an Advantage plan. Keep in mind that switching back to Original Medicare later in life may make it harder to get a Medigap policy without medical underwriting in most states.
Do I still pay the Part B premium if I have Medicare Part C?
Yes. Medicare Advantage is built on top of Part A and Part B, so you must continue paying your Part B premium, which is $202.90 per month in 2026 for most beneficiaries, plus any income-related surcharge.
Does Medicare Part C include prescription drug coverage?
Most Medicare Advantage plans include Part D prescription drug coverage bundled in, known as an MAPD plan. Some plans, particularly PFFS and certain PPO plans, do not include drug coverage, so you would need a standalone Part D plan if you choose one of those.
What income limits apply to Medicare Part C?
There is no income limit to enroll in Medicare Part C itself. Income only affects your Part B and Part D premiums through the income-related monthly adjustment amount (IRMAA), which applies regardless of whether you choose Original Medicare or a Medicare Advantage plan.
Can I have a Medigap policy with Medicare Part C?
No. Medigap (Medicare Supplement) policies are designed to work alongside Original Medicare only. It is illegal for an insurer to sell you a Medigap policy if you are enrolled in a Medicare Advantage plan.
If you are approaching 65 or reviewing your coverage for the year ahead, comparing your options carefully during open enrollment can make a real difference in what you pay and what is covered.
