Short answer: Medicare covers many medically necessary services used to diagnose and treat cancer. Coverage can come from Part A, Part B, and Part D, depending on where the service is provided and how a drug is administered.
Original Medicare coverage
Part A covers covered cancer treatment received during a formal inpatient hospital admission. Part B covers many outpatient services, including doctor visits, diagnostic imaging, laboratory tests, outpatient surgery, radiation therapy, and many chemotherapy drugs administered in a doctor’s office or clinic. Part B also covers certain oral cancer drugs under specific rules.
Part D may cover outpatient prescription drugs that Part B does not cover, including some oral chemotherapy, anti-nausea medicine, and pain medicine. Each Part D plan has a formulary and utilization rules.
Eligibility and limits
Services must be medically necessary and furnished by eligible providers and facilities. Coverage for a particular drug depends on the drug, how it is given, the diagnosis, the setting, and applicable Medicare rules. Clinical trials have separate requirements. Routine custodial care, noncovered nutritional products, and services provided only for convenience are not generally covered.
Costs
Part A deductibles and coinsurance may apply to an inpatient stay. Under Part B, the deductible and usually 20 percent coinsurance apply to many outpatient services. Hospital outpatient facility copayments may also apply. Part D costs depend on the drug, formulary tier, pharmacy, and phase of coverage. Other insurance may pay part of these amounts.
Medicare Advantage
Medicare Advantage plans must cover medically necessary cancer services covered by Original Medicare. Network, prior authorization, referral, and cost-sharing rules may apply. Drug coverage is governed by the plan’s medical and prescription-drug benefits.
What to do next
- Ask the care team where each service will be provided and which part of Medicare is expected to pay.
- Confirm provider and facility participation.
- Check every outpatient prescription against the plan formulary.
- Request a cost estimate and ask about authorization before planned treatment.
Coverage is determined from the claim, the patient’s eligibility, provider status, and applicable Medicare rules. A provider’s recommendation does not guarantee payment. Before a planned service, ask the provider what will be billed and ask Medicare or the plan whether any coverage review is required.
Sources
- Medicare.gov: Medicare Coverage of Cancer Treatment Services
- Medicare.gov: Outpatient prescription drugs
Last reviewed: August 2026. Medicare rules and plan benefits can change.