Written By

Greg Wohl

Licensed Medicare Specialist

Cancer is one of the most expensive medical conditions to treat. The average cost of cancer treatment in the United States ranges from $150,000 to over $1 million depending on the type and stage. For Medicare beneficiaries, the coverage available can mean the difference between financial security and financial devastation.

Medicare does cover most cancer treatments, but the coverage is split across multiple parts of Medicare, and the out-of-pocket costs can be significant without supplemental coverage. Understanding how Medicare covers cancer treatment before you need it is one of the most important things you can do for your financial health in retirement.

This guide explains exactly what each part of Medicare covers for cancer treatment, what you will pay out of pocket, and which plan type offers the best financial protection for cancer patients.

Key Takeaways

Medicare Part B covers most intravenous chemotherapy and immunotherapy: Chemotherapy drugs administered in a doctor's office or outpatient hospital setting are covered under Part B as physician-administered drugs. You pay 20% coinsurance after your Part B deductible, with no annual cap under Original Medicare.
Oral cancer drugs are covered under Part D, not Part B: Oral chemotherapy and targeted therapy drugs taken at home are covered under Medicare Part D. The $2,100 annual out-of-pocket cap under Part D in 2026 provides significant protection for patients on expensive oral cancer drugs.
Radiation therapy is covered under Part B: External beam radiation, brachytherapy, and stereotactic radiosurgery (such as CyberKnife or Gamma Knife) are all covered under Part B as outpatient services. You pay 20% coinsurance after your deductible.
Cancer surgery is covered under Part A or Part B depending on setting: Inpatient cancer surgery is covered under Part A. Outpatient surgery is covered under Part B. The distinction matters because Part A and Part B have different cost-sharing structures.
Medigap Plan G provides the strongest financial protection for cancer patients: Under Original Medicare with Plan G, your out-of-pocket costs are capped at the Part B deductible ($257 in 2026) plus any Part A deductible for inpatient stays. Plan G covers the 20% Part B coinsurance, which is the largest cost driver for cancer treatment.
Medicare Advantage plans have network restrictions that can limit cancer care: Medicare Advantage plans may not cover out-of-network cancer specialists or treatment centers. If you are diagnosed with cancer, Original Medicare with Medigap typically provides more flexibility to access any Medicare-accepting oncologist or cancer center in the country.

What Medicare Part A Covers for Cancer Treatment

Medicare Part A (hospital insurance) covers inpatient hospital stays related to cancer treatment. This includes inpatient surgery, inpatient chemotherapy administration, and inpatient stays for complications from treatment.

Part A cancer coverage includes:

Inpatient hospital stays for cancer surgery
Inpatient chemotherapy when administered during a covered hospital stay
Skilled nursing facility care following a qualifying 3-day hospital stay
Hospice care for terminal cancer patients
Home health care when medically necessary following a hospital stay

Part A cost-sharing for inpatient stays in 2026:

Deductible: $1,676 per benefit period (not per year)
Days 1 to 60: $0 coinsurance after the deductible
Days 61 to 90: $419 per day coinsurance
Days 91 to 150 (lifetime reserve days): $838 per day coinsurance

For cancer patients who require multiple hospitalizations, the per-benefit-period deductible can add up significantly. A Medigap plan covers these deductibles and coinsurance amounts.

What Medicare Part B Covers for Cancer Treatment

Medicare Part B (medical insurance) covers the majority of cancer treatment costs for most patients. Most chemotherapy is administered on an outpatient basis and covered under Part B.

Part B cancer coverage includes:

Intravenous (IV) chemotherapy administered in a doctor's office or outpatient hospital
Immunotherapy drugs administered by infusion (such as checkpoint inhibitors)
Targeted therapy drugs administered by infusion
Radiation therapy (external beam, brachytherapy, stereotactic radiosurgery)
Outpatient cancer surgery
Doctor visits, oncology consultations, and follow-up care
Diagnostic imaging (CT scans, PET scans, MRI) related to cancer diagnosis and monitoring
Laboratory tests and pathology
Cancer screenings (colonoscopy, mammogram, prostate cancer screening, lung cancer screening)

Part B cost-sharing: You pay 20% coinsurance after your Part B deductible ($257 in 2026). Under Original Medicare, there is no annual cap on this 20% coinsurance. A cancer patient receiving IV chemotherapy at $10,000 per infusion would owe $2,000 per infusion in coinsurance under Original Medicare without a supplement.

This is why Medigap Plan G is so valuable for cancer patients. Plan G covers the 20% Part B coinsurance, eliminating the largest out-of-pocket cost driver for cancer treatment.

What Medicare Part D Covers for Oral Cancer Drugs

Oral chemotherapy, targeted therapy pills, and hormone therapy drugs taken at home are covered under Medicare Part D, not Part B. This distinction matters because Part D has different cost-sharing rules.

The $2,100 annual cap is critical for cancer patients: In 2026, Medicare Part D caps your annual out-of-pocket drug costs at $2,100. Before this cap was introduced, patients on expensive oral cancer drugs like Ibrance, Revlimid, or Gleevec could face $10,000 or more per year in drug costs. The cap provides meaningful financial protection.

Part D formulary considerations: Not all Part D plans cover all oral cancer drugs. Some drugs may require prior authorization or step therapy. When choosing a Part D plan, cancer patients should verify that their specific oral cancer drugs are covered on the plan's formulary and at what tier.

The Medicare Drug Price Negotiation program has begun reducing costs for some high-use drugs. Several cancer drugs are among those being targeted for negotiation, which may further reduce costs in coming years.

For more on Part D coverage and enrollment, see our guide on Medicare Part D enrollment.

Original Medicare vs. Medicare Advantage for Cancer Patients

The choice between Original Medicare and Medicare Advantage has significant implications for cancer patients. The two approaches offer very different trade-offs.

Factor	Original Medicare + Medigap	Medicare Advantage
Provider access	Any Medicare-accepting provider nationwide	Network-restricted; out-of-network may not be covered
Cancer center access	All NCI-designated cancer centers covered	Only in-network cancer centers covered
Out-of-pocket cap	Effectively capped by Medigap (Plan G covers 20% coinsurance)	Annual OOP max ($9,350 in 2026); copays apply per service
Monthly premium	Higher (Part B + Part D + Medigap)	Lower (often $0 plan premium + Part B)
Referral requirements	No referrals needed for specialists	HMO plans require referrals; PPO plans typically do not

For cancer patients, Original Medicare with Medigap Plan G is generally the stronger choice because it provides unrestricted access to any Medicare-accepting oncologist or cancer center, and the Medigap coverage eliminates the 20% coinsurance that would otherwise be the largest cost driver.

For help comparing your options, schedule a free consultation with our licensed specialists.

What Medicare Does Not Cover for Cancer

While Medicare covers most cancer treatment costs, there are important gaps to be aware of.

Medicare does not cover:

Routine dental care, even if related to cancer treatment preparation (such as dental clearance before head and neck radiation)
Hearing aids, even if hearing loss results from chemotherapy (ototoxicity)
Most clinical trial costs beyond routine care costs (though Medicare does cover routine costs in approved clinical trials)
Long-term custodial care in a nursing home when skilled care is not needed
Most care outside the United States, including cancer treatment abroad
Experimental treatments not approved by Medicare

Clinical trials: Medicare covers the routine costs of care in qualifying clinical trials. If you are considering a clinical trial, verify that the trial is a qualifying trial under Medicare's clinical trial policy before enrolling.

Dental coverage gap: Head and neck cancer patients often require dental work before radiation therapy to prevent serious complications. Medicare does not cover this dental care. Some Medicare Advantage plans include dental benefits that may help cover this cost.

The Bottom Line on Medicare and Cancer Treatment

Medicare provides substantial coverage for cancer treatment, but the out-of-pocket costs under Original Medicare alone can be significant. Here is the key summary:

Part A covers inpatient cancer surgery, inpatient chemotherapy, and hospice care
Part B covers IV chemotherapy, immunotherapy, radiation, outpatient surgery, and diagnostic imaging; you pay 20% coinsurance with no cap
Part D covers oral cancer drugs with a $2,100 annual out-of-pocket cap in 2026
Medigap Plan G covers the 20% Part B coinsurance and is the strongest financial protection for cancer patients
Original Medicare provides unrestricted access to any Medicare-accepting oncologist or cancer center; Medicare Advantage has network restrictions

If you or a family member has been diagnosed with cancer, reviewing your Medicare coverage options is urgent. Our licensed specialists can help you understand your current coverage and identify any gaps. Schedule a free consultation today.