Medicare covers radiation therapy as a cancer treatment, but the amount you pay depends on which part of Medicare you have and where you receive the treatment.

If you have Original Medicare (Part A and Part B), radiation therapy is covered when a doctor orders it to treat cancer. Part B covers the radiation oncologist's services and the planning that goes into your treatment. Part A covers the hospital facility costs if you receive radiation as an inpatient, though most radiation therapy happens in outpatient clinics.

If you have a Medicare Advantage plan (Part C), radiation therapy is covered, but you will pay according to that plan's rules — copays, coinsurance, or deductibles may differ from Original Medicare. You should contact your plan directly to learn what you will owe before treatment starts.

The key point: Medicare does not refuse to cover radiation therapy for cancer. What you pay out of pocket depends on your coverage type and the specific facility where you receive treatment.

Key Takeaways

  • Original Medicare Part B covers the radiation oncologist's services and treatment planning; Part A covers inpatient facility costs if applicable.
  • You typically pay 20 percent coinsurance for Part B services after you meet your annual deductible under Original Medicare.
  • Medicare Advantage plans cover radiation therapy but may charge different copays or coinsurance amounts depending on the plan.
  • Outpatient radiation clinics are the most common setting, and costs vary based on whether the facility is hospital-based or independent.
  • Supplemental insurance (Medigap) can cover some or all of the coinsurance you would otherwise owe under Original Medicare.

How Original Medicare Pays for Radiation Therapy

Under Original Medicare, Part B covers the professional services: the radiation oncologist's consultation, treatment planning, and the actual radiation sessions. After you meet your annual Part B deductible (the amount changes each year), you pay 20 percent coinsurance for each service. The remaining 80 percent is covered by Medicare.

The facility where you receive radiation also matters. If treatment happens at a hospital outpatient department, you may owe a facility copay in addition to the 20 percent coinsurance for the doctor's service. If treatment happens at an independent radiation center (not part of a hospital), you typically pay only the 20 percent coinsurance — no separate facility charge.

If you are admitted to a hospital as an inpatient and receive radiation there, Part A covers the hospital stay and facility costs. You would owe your Part A deductible and then coinsurance for days beyond a certain threshold, depending on how long you stay.

What You Pay Out of Pocket

Your out-of-pocket costs under Original Medicare depend on three things: whether you have met your deductible, where you receive treatment, and whether you have supplemental insurance.

If you have not met your Part B deductible for the year, you pay the full cost of your first few radiation sessions until the deductible is satisfied. Once the deductible is met, you pay 20 percent of the Medicare-approved amount for each session. A typical course of radiation therapy lasts several weeks, so costs add up. If you receive treatment at a hospital outpatient department, add the facility copay on top of the 20 percent coinsurance.

Medigap supplemental insurance (also called Medigap) can cover some or all of the 20 percent coinsurance you would otherwise owe. Not all Medigap plans cover the same amount, so review your plan documents or call your insurer to confirm what radiation therapy costs you will have to pay yourself.

Medicare Advantage Plans and Radiation Therapy

Medicare Advantage plans (Part C) must cover radiation therapy for cancer, but each plan sets its own copays, coinsurance, and deductibles. Some plans may charge a flat copay per radiation session (for example, $50 per visit). Others may charge coinsurance (a percentage of the cost). A few plans may have a separate deductible you must meet before coverage begins.

The best way to understand your costs is to contact your plan's customer service before scheduling radiation. Ask them: What is the copay or coinsurance per radiation session? Is there a deductible? Does it matter whether the radiation center is in-network or out-of-network? Some plans charge more if you go out-of-network, and radiation centers in your area may not all be in-network.

If you are switching plans during the annual enrollment period (October 15 to December 7), radiation therapy costs can be a reason to change. If you know you will need radiation soon, compare the plans available to you and pick the one with the lowest out-of-pocket costs for that treatment.

Hospital-Based vs. Independent Radiation Centers

Where you receive radiation therapy affects what you pay. Hospital outpatient departments are part of a hospital system, and Medicare charges a facility fee in addition to the professional fee for the radiation oncologist. Under Original Medicare, this means you pay coinsurance on both the doctor's service and the facility charge.

Independent radiation centers are not part of a hospital. Medicare does not charge a separate facility fee at these locations — you pay only the 20 percent coinsurance on the radiation oncologist's professional service. For this reason, independent centers are often less expensive under Original Medicare.

Your oncologist may recommend a specific center based on equipment, informed, or convenience. If cost is a concern, ask whether your doctor can refer you to an independent center, or ask the center itself whether it is hospital-based or independent. Your Medicare Summary Notice (the bill you receive after each service) will show whether a facility charge was applied.

Planning Ahead to Manage Costs

Before radiation therapy begins, gather information so you can budget. Ask your radiation oncology office for an estimate of how many sessions you will need and the cost per session under your specific Medicare coverage. If you have Original Medicare, ask whether the center is hospital-based or independent — that changes your facility costs.

If you have not met your Part B deductible for the year, ask when your deductible resets (January 1). If radiation is scheduled late in the year, you might meet the deductible quickly and then pay only 20 percent for the remaining sessions. If it is early in the year, you will pay the full deductible amount first.

If you have a Medicare Advantage plan, call your plan and ask for an estimate in writing. Plans are required to provide cost estimates when you request them. Keep that estimate so you can compare it to your actual bills later and catch any errors.

Frequently Asked Questions

Does Medicare cover proton therapy or other advanced radiation types?

Yes. Medicare covers proton therapy, intensity-modulated radiation therapy (IMRT), and other advanced radiation techniques when a doctor orders them to treat cancer. You pay the same coinsurance (20 percent under Original Medicare) regardless of the radiation type. Some Medicare Advantage plans may have specific rules about which radiation types require prior approval, so check with your plan first.

What if my radiation oncologist is out of network?

Under Original Medicare, there is no in-network or out-of-network — Medicare pays the same amount regardless of which doctor you see. You pay 20 percent coinsurance on the Medicare-approved amount. Under Medicare Advantage, out-of-network doctors may cost more or may not be covered at all, depending on your plan. Check your plan documents or call customer service before scheduling.

Will Medicare cover radiation therapy if it is palliative (to relieve pain) rather than curative?

Yes. Medicare covers radiation therapy ordered by a doctor to treat cancer, whether the goal is to cure it or to manage pain and symptoms. The coverage and costs are the same as for curative radiation.

Do I need prior approval from Medicare before starting radiation?

Original Medicare does not require prior approval for radiation therapy ordered by your doctor. Medicare Advantage plans may require prior approval — check your plan documents or ask your radiation center to verify coverage before your first appointment.

What happens if I reach my out-of-pocket maximum?

Original Medicare does not have an annual out-of-pocket maximum — you pay 20 percent coinsurance for covered services for the entire year. Medicare Advantage plans do have out-of-pocket maximums, and once you reach it, the plan covers 100 percent of in-network covered services for the rest of the year. Ask your plan what the maximum is and track your spending as you receive treatment.