Part C is an alternative way to get your Medicare benefits through a private insurance company

Part C, also called Medicare Advantage, is a plan sold by private insurance companies that bundles your Part A hospital coverage and Part B medical coverage into one plan. Instead of getting those benefits directly from Medicare, you enroll in a Part C plan and the insurance company becomes responsible for providing them. Most Part C plans also include prescription drug coverage (Part D) built in, so you do not have to buy a separate drug plan.

The trade-off is that Part C plans usually have networks — you must use doctors and hospitals in that network, except in emergencies. Many plans charge lower monthly premiums than Original Medicare plus a separate Medigap policy, but you may pay more when you actually use care through copays and coinsurance.

Key Takeaways

  • Part C plans cover the same hospital and medical services as Original Medicare, but through a private insurance company instead of directly from Medicare.
  • Most Part C plans include prescription drug coverage at no extra cost, while Original Medicare requires you to buy Part D separately.
  • Part C plans have networks, meaning you usually must use in-network doctors and hospitals or pay more out of pocket.
  • You pay a monthly premium to the insurance company, plus copays and coinsurance when you receive care, and you cannot use a Medigap policy alongside Part C.

Hospital and medical services covered under Part C

Part C covers all the same hospital and doctor services that Original Medicare covers. That includes inpatient hospital stays, doctor visits, lab tests, imaging, outpatient surgery, and emergency care. If your plan includes it, you also get preventive services like annual wellness visits, cancer screenings, and vaccines at no copay.

The difference is in how you access them. With Original Medicare, you can see any doctor or hospital that accepts Medicare. With Part C, your plan publishes a network of doctors and hospitals, and you pay less (or nothing) when you use them. If you see an out-of-network provider, you pay more — sometimes significantly more — or the plan may not cover the visit at all, except in emergencies.

Prescription drug coverage included in most Part C plans

Most Part C plans bundle prescription drug coverage into the plan itself, so you do not have to buy a separate Part D plan. The plan covers both brand-name and generic drugs, though you may pay different amounts depending on which tier the drug falls into. You typically pay a copay at the pharmacy when you fill a prescription.

A few Part C plans do not include drug coverage, which is rare. If you enroll in one of those, you would need to buy a separate Part D plan. You can check the drug coverage details for any plan you are considering on Medicare.gov before you enroll.

Extra benefits many Part C plans offer

Because Part C plans compete for your enrollment, many offer benefits that Original Medicare does not cover. These may include dental care (cleanings, fillings, extractions), vision care (eye exams, glasses, contact lenses), hearing aids, fitness programs, or transportation to medical appointments. The specific benefits and how much they cover vary widely by plan and by region.

These extra benefits can be a real advantage if you use them, but they are not may provide. A plan that covers dental care in one year may change its coverage the next year, or may not be available in your area. Always check the current plan documents for the specific year you are enrolling.

What you pay with Part C: premiums, copays, and deductibles

You pay a monthly premium directly to the insurance company (not to Medicare). Many plans have a zero premium, meaning you pay nothing monthly beyond your Part B premium to Medicare. However, some plans do charge a monthly premium on top of that.

When you use care, you also pay copays (a flat amount per visit) or coinsurance (a percentage of the cost). Part C plans have an annual out-of-pocket maximum — once you reach it, the plan covers the rest of your care for that year. This maximum varies by plan but is capped by Medicare at a certain amount each year.

You cannot use a Medigap policy (supplemental insurance) alongside Part C. Medigap is designed to fill gaps in Original Medicare, but Part C already includes those benefits, so Medigap would be redundant and is not allowed.

When you can enroll in Part C and how to switch plans

You can enroll in Part C during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Coverage begins January 1 of the following year. If you are newly may be able to access for Medicare, you have a one-time Initial Enrollment Period to join a Part C plan without penalty.

If you are already in a Part C plan and want to switch to a different one — or switch to Original Medicare — you can do so during the Annual Enrollment Period. You can also switch plans during the Medicare Advantage Open Enrollment Period, which runs January 1 to March 31 each year, but only if you are already enrolled in a Part C plan.

How to compare Part C plans in your area

Medicare.gov has a plan comparison tool where you enter your zip code and see all the Part C plans available to you. For each plan, you can see the monthly premium, the copays and coinsurance for common services, which doctors and hospitals are in the network, and what extra benefits are included.

You can also read the plan's Summary of Benefits and Coverage document, which lists exactly what is covered and what you pay. Many people find it helpful to list the doctors they see most often and check whether those doctors are in-network for the plans they are considering. If your current doctor is not in a plan's network, you may want to choose a different plan or ask your doctor if they are planning to join that network.

Frequently Asked Questions

Can I use my current doctor with a Part C plan?

It depends on whether your doctor is in that plan's network. Before you enroll, check the plan's provider directory on Medicare.gov or call the plan directly. If your doctor is not in the network, you can either choose a different plan or ask your doctor if they plan to join that network in the future.

What happens if I need emergency care out of state with Part C?

Part C plans cover emergency and urgent care anywhere in the United States, even if the provider is out of network. You may pay a higher copay than you would in-network, but the plan must cover the emergency. For urgent care that is not life-threatening, coverage varies by plan, so check your plan documents.

Can I switch from Part C back to Original Medicare?

Yes. You can switch during the Annual Enrollment Period (October 15 to December 7) or during the Medicare Advantage Open Enrollment Period (January 1 to March 31). If you switch to Original Medicare, you may want to buy a Medigap policy to cover costs that Original Medicare does not pay.

Do Part C plans cover dental and vision care?

Many do, but not all. Coverage varies by plan and region. Some plans offer basic dental (cleanings and exams), while others cover more extensive work. Check the plan's Summary of Benefits document to see exactly what dental and vision services are covered and what you pay.

What is the difference between Part C and Medigap?

Part C is a complete alternative to Original Medicare sold by private companies. Medigap is supplemental insurance that works alongside Original Medicare to cover costs that Medicare does not pay. You choose one or the other, not both. Part C often costs less in monthly premiums but may have higher copays and network restrictions.