Medicare covers most cancer treatments, but not all of them, and what you pay depends on which part of Medicare you have

Medicare Part A covers inpatient hospital care for cancer treatment, including surgery, chemotherapy given during a hospital stay, and related procedures. Medicare Part B covers outpatient services: chemotherapy infusions at a clinic or doctor's office, radiation therapy, imaging scans, lab work, and visits with oncologists. Part D covers prescription cancer drugs you take at home. The catch is that you will pay a share of the cost — a deductible, copayments, or coinsurance — and some newer drugs or treatments may not be covered at all.

What Medicare does not cover includes experimental treatments not yet approved by the FDA, some targeted therapies or immunotherapies depending on the drug and your diagnosis, and treatments given outside the United States. If your oncologist recommends something and you are unsure whether Medicare will cover it, ask the doctor's office to check with Medicare before you start treatment. That takes a few days but can save you thousands in unexpected bills.

Key Takeaways

  • Medicare Part A covers inpatient cancer surgery and chemotherapy; Part B covers outpatient chemotherapy, radiation, scans, and doctor visits; Part D covers oral cancer medications.
  • You will owe a deductible, copayments, or coinsurance for each service, and these costs add up quickly during cancer treatment.
  • Some newer drugs, immunotherapies, and targeted treatments may not be covered, so ask your oncologist to verify coverage before starting.
  • If you have a Medigap or Medicare Advantage plan, your out-of-pocket costs and coverage rules may be different from Original Medicare.
  • Cancer treatment often involves multiple providers and services, so tracking what Medicare covers at each step prevents billing surprises.

What Part A covers during cancer hospitalization

Medicare Part A pays for a hospital stay when you need inpatient treatment for cancer. This includes the hospital bed, meals, nursing care, and most procedures done while you are admitted. If you have surgery to remove a tumor, Part A covers the operating room, anesthesia, and the surgeon's fee. If you receive chemotherapy as an inpatient — sometimes done for certain types of cancer or when side effects require monitoring — Part A covers that too.

You pay a deductible for each hospital stay (the amount changes yearly), and after that, Medicare covers the full cost for days 1 through 60. Days 61 through 90 require a daily coinsurance payment. Most cancer patients do not stay in the hospital for extended periods, so the deductible is usually your main out-of-pocket cost for Part A services.

What Part B covers for outpatient cancer care

Medicare Part B covers the majority of cancer treatment because most happens outside the hospital. Chemotherapy infusions at an oncology clinic or doctor's office are covered. Radiation therapy — whether external beam radiation or brachytherapy — is covered. Imaging scans (CT, PET, MRI, ultrasound) used to diagnose or monitor cancer are covered. Lab work and pathology reports are covered. Visits with your oncologist, surgeon, or other cancer specialists are covered.

For Part B services, you typically pay 20 percent coinsurance after you meet your annual deductible. Some preventive cancer screenings — mammograms, colorectal cancer screening, cervical cancer screening — are covered with no coinsurance if you see an in-network provider. But once you have a cancer diagnosis and begin treatment, the 20 percent coinsurance applies to most services.

One important limit: Medicare covers chemotherapy drugs given by injection or infusion in a medical setting, but oral chemotherapy drugs are covered under Part D, not Part B. This distinction matters because Part D has different cost-sharing rules and formularies (lists of covered drugs).

What Part D covers for oral and at-home cancer medications

Medicare Part D covers prescription cancer drugs you take at home, including oral chemotherapy, targeted therapies, and immunotherapy pills. However, Part D plans vary widely in which drugs they cover. Some newer cancer drugs are expensive and may be on a higher cost tier, meaning you pay more out of pocket. Others may require prior authorization — your doctor must ask the plan for permission before you start the drug.

If your oncologist prescribes a drug and your Part D plan does not cover it, you have options. You can ask the plan to make an exception (called a formulary exception or coverage information). You can switch to a different Part D plan during the annual enrollment period if a competitor's plan covers the drug. Or you can pay out of pocket, though cancer drugs often cost hundreds or thousands of dollars per month.

Talk to your oncologist and your Part D plan before starting any new medication. The oncologist's office can often submit the prior authorization request, and the plan can tell you upfront what your copayment or coinsurance will be.

Costs you will owe under Original Medicare

Under Original Medicare (Part A and Part B), you pay a Part A deductible per hospital stay, a Part B deductible per year, and then 20 percent coinsurance for most Part B services. For Part D, you pay a monthly premium, an annual deductible (which varies by plan), and then copayments or coinsurance depending on which tier your drug is on.

Cancer treatment often involves multiple services in a single month — chemotherapy infusions, imaging scans, lab work, and doctor visits — so your coinsurance adds up quickly. Many people with cancer reach their out-of-pocket maximum during treatment, after which Medicare covers 100 percent of covered services for the rest of the year. However, the out-of-pocket maximum under Original Medicare is high, and you are responsible for the full cost of any uncovered services.

If cost is a concern, ask your oncologist's office about financial information programs run by the hospital or cancer center, or by the drug manufacturer. Many offer copayment information or free medication to people who meet income limits.

How Medicare Advantage and Medigap plans change your coverage

If you have a Medicare Advantage plan (Part C), your cancer coverage works differently. Medicare Advantage plans must cover everything Original Medicare covers, but they set their own copayments, coinsurance, and prior authorization rules. Some plans cover more — for example, some cover acupuncture for nausea or nutritional counseling — but others have higher copayments for specialist visits or chemotherapy. You need to check your plan's formulary and coverage rules before starting treatment.

If you have a Medigap (supplemental insurance) plan, it pays some or all of the coinsurance and deductibles that Original Medicare does not cover. This can significantly reduce your out-of-pocket costs during cancer treatment. However, Medigap plans do not cover services that Medicare does not cover, so if Medicare denies a treatment, Medigap will not pay for it either.

Treatments Medicare may not cover

Medicare does not cover experimental cancer treatments — those still in clinical trials or not yet approved by the FDA. However, if you are enrolled in an FDA-approved clinical trial, Medicare will cover the routine care costs (like chemotherapy and scans) even if the trial drug itself is experimental. Ask your oncologist whether any trial you are considering qualifies.

Some newer immunotherapy drugs and targeted therapies are covered by Medicare, but coverage decisions change and vary by diagnosis. For example, a drug approved for one type of cancer may not be covered for another type, or may require prior authorization. Your oncologist's office should check with Medicare before you start any new drug.

Medicare also does not cover cancer treatment received outside the United States, even if you travel for care. If you are considering treatment abroad, understand that Medicare will not reimburse those costs.

How to verify coverage before you start treatment

Before your first chemotherapy infusion, imaging scan, or new medication, ask your oncologist's office to verify coverage with Medicare. Provide them with your Medicare number and the specific drug name, procedure code, or service. The office can call Medicare or check online to confirm whether the service is covered and what your cost-sharing will be.

If Medicare denies coverage or requires prior authorization, the doctor's office can submit a request or appeal on your behalf. This process usually takes a few days to a week. Do not delay treatment while waiting for a coverage decision — start the verification process as soon as your oncologist recommends a treatment plan.

Keep copies of all coverage determinations and denial letters. If you receive a bill you believe Medicare should have covered, you can file an appeal. The appeal process is separate from the coverage verification process, so having documentation helps.

Frequently Asked Questions

Does Medicare cover cancer screening if I do not have symptoms?

Yes. Medicare covers mammograms for breast cancer, colonoscopy for colorectal cancer, and Pap tests for cervical cancer at no cost if you see an in-network provider. These are considered preventive services. However, once you have a cancer diagnosis, screening becomes treatment-related and different cost-sharing rules may explore.

What if my oncologist says I need a drug that Medicare does not cover?

Ask your doctor to submit a prior authorization request or coverage information request to Medicare. Many drugs are covered with prior authorization even if they are not automatically on the formulary. If Medicare still denies it, you can appeal, ask for a formulary exception, or explore copayment information programs from the drug manufacturer.

Do I have to use an in-network oncologist for Medicare to cover treatment?

No. Medicare covers cancer treatment from any licensed provider, whether in-network or out-of-network. However, if you see an out-of-network provider, you may owe higher coinsurance. If you have a Medicare Advantage plan, check your plan's network first, because out-of-network care may cost more or require prior authorization.

Will Medicare cover a second opinion from another oncologist?

Yes. Medicare covers office visits with any licensed oncologist, so you can see a second oncologist for a consultation. This is common in cancer care and Medicare treats it as a regular office visit covered under Part B.

What happens to my cancer treatment coverage if I turn 65 and enroll in Medicare mid-treatment?

Medicare coverage begins the first day of the month you turn 65 (or the month you enroll if you delay). If you were covered by another insurance plan before, that plan remains primary until Medicare starts. Coordinate with your oncologist's office to update your insurance information so claims go to the right payer and you do not face unexpected bills.