Medicare Cancer Treatment Coverage 2026: What Seniors Must Know

A cancer diagnosis at any age is life-altering — but for seniors on Medicare, one of the first questions that follows is: How much of this will Medicare pay for? The answer is reassuring: Medicare covers a comprehensive range of cancer treatments, from chemotherapy and radiation to surgery and immunotherapy. However, the coverage is split across multiple parts of Medicare, the costs can vary dramatically, and knowing the rules can help you plan financially and access the best possible care. This complete guide breaks down exactly what Medicare covers for cancer treatment in 2026.

Medicare Cancer Coverage 2026: Which Part Pays for What

Chemotherapy Coverage Under Medicare in 2026

IV Chemotherapy (Part B)

Intravenous chemotherapy administered in a hospital outpatient department, cancer center, or physician’s office is covered under Medicare Part B. Part B pays 80% of the Medicare-approved amount after your $283 annual deductible. You are responsible for the remaining 20% — which, for expensive cancer drugs, can be substantial. A single infusion of bevacizumab (Avastin) for colon or lung cancer costs approximately $7,000–$10,000 per infusion. Your 20% coinsurance on an $8,000 infusion would be $1,600 per treatment session. Without a Medigap supplement, these costs accumulate rapidly.

Oral Chemotherapy (Part D) — The $2,100 Cap Changes Everything

Many modern cancer treatments come in pill form taken at home and are covered under Medicare Part D. The landmark 2026 change is the $2,100 annual out-of-pocket cap:

• Once you spend $2,100 out-of-pocket on covered drugs in a calendar year, you pay $0 for the rest of the year
• This cap dramatically helps seniors on expensive oral cancer medications — Ibrance (palbociclib) for breast cancer has a list price of ~$12,000/month, Lenalidomide for multiple myeloma ~$20,000/month
• The Medicare Prescription Payment Plan (MPPP) lets you spread costs across monthly installments — critical for seniors who receive expensive drugs early in the year

Radiation Therapy Coverage

Radiation therapy — whether external beam radiation, IMRT, stereotactic radiosurgery (CyberKnife, Gamma Knife), or brachytherapy — is covered under Medicare Part B at 80% of the approved amount after the $283 deductible. A complete radiation course might involve 20–40 sessions over several weeks. Medigap Plan G will cover the 20% coinsurance in full, making this essentially cost-free for Plan G enrollees.

Immunotherapy and Targeted Therapy Coverage

Immunotherapy (checkpoint inhibitors like Keytruda/pembrolizumab, Opdivo/nivolumab) and targeted therapies represent the cutting edge of cancer treatment. Coverage depends on administration:

• IV immunotherapy and targeted therapy: Covered under Part B at 80% — often the most expensive treatments, with list prices of $10,000–$25,000 per infusion
• Oral targeted therapies: Covered under Part D — subject to the $2,100 annual OOP cap
• Biosimilars: Many biologics now have lower-cost biosimilar alternatives that Medicare covers at the same rate — ask your oncologist if a biosimilar is appropriate

Cancer Surgery Under Medicare

• Inpatient surgery: Covered under Part A with a $1,736 deductible per benefit period in 2026. Days 1–60 of your hospital stay have no additional daily cost
• Outpatient surgery: Covered under Part B at 80% after the $283 deductible — includes same-day surgeries at ambulatory surgical centers
• Reconstructive surgery following mastectomy: Specifically required by federal law to be covered by both Original Medicare and Medicare Advantage

Diagnostic Tests and Scans Medicare Covers for Cancer

Cancer diagnosis and monitoring requires extensive imaging and laboratory testing. Medicare covers these under Part B at 80% after deductible:

• CT scans: For staging, monitoring, and surveillance
• PET scans: Covered for most solid tumor cancers for initial staging, treatment monitoring, and re-staging
• MRI: For brain, spine, and soft tissue evaluation
• Bone scans: For detecting metastatic spread
• Biopsies: Ultrasound-guided, CT-guided, or surgical biopsies
• Genetic testing: BRCA, MSI, KRAS, and other molecular testing under appropriate clinical circumstances

Cancer Screening Covered at Zero Cost by Medicare

Prevention is always better than treatment. Medicare covers these cancer screenings at no cost to you:

• Colonoscopy: Every 10 years for average risk (age 45+), every 2 years for high-risk
• Mammogram: Annually for women 40+
• Lung cancer screening (low-dose CT): Annually for current or former heavy smokers aged 50–77
• Prostate-specific antigen (PSA) test: Annually for men 50+ under Part B
• Cervical cancer screening (Pap smear): Every 24 months; annually for high-risk women
• Colorectal DNA stool test (Cologuard): Every 1–3 years for average risk adults 45–85

How to Reduce Your Out-of-Pocket Cancer Costs in 2026

1. Enroll in Medigap Plan G: Covers the 20% Part B coinsurance — critical for expensive IV chemotherapy and radiation. Without it, you face unlimited Part B out-of-pocket exposure
2. Maximize the $2,100 Part D cap: Enroll in the Medicare Prescription Payment Plan to spread high costs across months
3. Apply for Medicare Extra Help: If your income is below $22,590 (individual), you may qualify for near-zero Part D costs
4. Apply for pharmaceutical patient assistance programs: Most major cancer drug manufacturers have programs covering costs for Medicare patients who meet income requirements
5. Ask about biosimilar alternatives: Many brand-name cancer drugs now have lower-cost equivalents covered at lower Part D tiers

Medicare Advantage and Cancer: Proceed with Caution

If you are enrolled in Medicare Advantage (Part C), cancer coverage must equal Original Medicare — but the experience can differ significantly:

• Prior authorization requirements: Many MA plans require prior authorization for chemotherapy, immunotherapy, and imaging — delays in approval can delay life-saving treatment
• Network restrictions: Major cancer centers like MD Anderson, Memorial Sloan Kettering, and Mayo Clinic may be out-of-network for your Medicare Advantage plan
• Out-of-pocket maximums: MA plans have a $9,250 annual OOP maximum (2026) for in-network — but out-of-network costs do not count toward this cap

If you receive a serious cancer diagnosis and are on Medicare Advantage, strongly consider whether switching to Original Medicare + Medigap (if you qualify medically) would provide better access to leading specialists and lower total costs.

Palliative Care and Hospice for Cancer Patients

Medicare covers palliative care — treatment focused on symptom relief and quality of life — under Part B, including pain management consultations, social work services, and psychological support. For cancer patients with a prognosis of 6 months or less, Medicare hospice care (Part A) covers 100% of comfort-focused care including medications, nursing visits, aide services, and equipment. You can revoke hospice election at any time and return to curative treatment.

5 Action Steps After a Cancer Diagnosis

1. Contact your SHIP counselor for free, unbiased Medicare coverage help — call 1-877-839-2675
2. Ask your oncologist’s billing department to verify your specific treatment codes will be covered before beginning
3. Review your Medigap or Medicare Advantage plan immediately — unbuffered Part B coinsurance for cancer treatment can be financially devastating
4. Apply for pharmaceutical assistance programs before your first treatment if taking an oral cancer medication
5. Get a second opinion — Medicare Part B covers second opinion consultations; you are entitled to this at no additional cost beyond normal Part B cost-sharing

— Margaret Collins, Senior Health Expert

Sources

• Medicare.gov — Cancer Treatment Coverage
• American Cancer Society — Medicare and Cancer Coverage
• CMS.gov — 2026 Medicare Costs and Benefits

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