Does Medicare cover cancer treatment in Peoria, AZ?

Yes. Medicare covers cancer treatment, including surgery, chemotherapy, radiation and cancer drugs, and on Original Medicare you pay the Part B deductible and then 20% of the Medicare-approved amount for outpatient treatment, with no annual limit on that 20%. A Medicare Supplement pays most or all of it. A Medicare Advantage plan limits it with a yearly out-of-pocket maximum and adds a network. Cancer pills you take at home fall under Part D, where your spending on covered drugs stops at $2,100 in 2026.

That is the federal answer and it is the same in Peoria as in Pittsburgh. The local part is where the treatment happens and how you get there. From Vistancia or Trilogy, an infusion chair is a drive to Arrowhead or into Sun City, and a course of radiation can mean that drive five days a week for six weeks. A good number of households in 85383 also spend the summer somewhere cooler, and cancer treatment does not pause for the season. Which kind of Medicare you carry decides who can treat you, in which state, and what the year costs.

What Medicare pays for cancer treatment

Medicare splits cancer care across three parts, and the setting decides which one pays.

Source: Medicare.gov, "Chemotherapy" and "Radiation therapy"; CMS, "Medicare Coverage of Cancer Treatment Services" (Product No. 11931); CMS 2026 Parts A and B fact sheet. Figures apply identically in Maricopa County.

Two details in that table catch people out.

The first is that being in a hospital bed does not make you an inpatient. Medicare’s cancer booklet says it directly: you may be in a hospital and still be considered an outpatient, on what is called observation status. In that case Part B is paying, not Part A, and the bill is built differently. I have written about what observation status does to the bill separately.

The second is that when you receive chemotherapy in a hospital outpatient department, Medicare.gov says your copayment for a single service will not be more than the inpatient hospital deductible. That is a limit per service, not per year, and it is the only limit Original Medicare puts on the outpatient side.

Does Medicare cover 100% of cancer treatment?

No, and the part it leaves is the reason this question matters more for cancer than for almost anything else Medicare covers.

The arithmetic is simple and worth doing once. If Medicare approves $150,000 of infusions, radiation and scans across a year of treatment, 20% of that is $30,000. That figure is an illustration of how the percentage behaves, not a typical bill. Some courses of treatment cost far less and some of the newer infused drugs cost more. The point is that a percentage with no ceiling is a different kind of risk from a copay.

Very few people carry Original Medicare with nothing on top, and this is why. There are two ways to close the gap.

A Medicare Supplement. Plan G pays the Part A hospital deductible and the Part B 20%, which leaves you the $283 Part B deductible for the year and very little else on the medical side. Plan N does nearly the same with a copay of up to $20 on some office visits. Neither has a network. The Plan G versus Plan N comparison shows the difference in dollars.

A Medicare Advantage plan. The plan replaces the 20%-forever problem with a yearly out-of-pocket maximum. You pay the plan’s copays and coinsurance until you reach it, and then covered Part A and Part B care costs nothing more for the rest of that calendar year. More on how that works for cancer below, because the details are not what most people assume.

Are cancer drugs covered under Part B or Part D?

Both, and which one depends on how the drug gets into you.

Infused or injected at a clinic: Part B. Medicare’s booklet lists “many chemotherapy drugs that are administered through your vein in an outpatient clinic or a doctor’s office” under Part B. You pay 20% after the deductible, and a supplement picks that up.

Taken by mouth at home: usually Part D. Medicare.gov says Part B covers some oral cancer drugs, but only if the same drug is available in an injectable form or is a prodrug of one. It also covers oral anti-nausea drugs taken before, during or within 48 hours of chemotherapy. Everything else you swallow at home, including most of the newer targeted therapies, goes through your Part D plan.

That second group is where the Part D cap changed things. Oral cancer drugs are among the most expensive prescriptions a pharmacy fills, and until recently there was no hard ceiling on what a patient could owe for them. Now there is: $2,100 in 2026, rising to $2,400 for 2027. A single fill of a specialty cancer drug can take you most of the way there in January, which is what the Medicare Prescription Payment Plan is for. It spreads the year’s drug costs into monthly bills from the plan. It does not reduce what you owe. The 2027 Part D cap post covers both.

The cap applies only to drugs on your plan’s formulary. If you are prescribed a drug your plan does not list, your doctor can ask the plan for an exception, and you can appeal if it is refused. During open enrollment, checking that a drug you already take is on next year’s list is the single most useful ten minutes you can spend.

What a Medicare Advantage plan does differently for cancer

Every Advantage plan has to cover the cancer treatment Original Medicare covers. Within that, four things change, and the first surprises people.

You may still pay 20% on chemotherapy. Most benefits on an Advantage plan are flat copays. Infused cancer drugs are usually the exception. CMS rules say a plan may not charge more than Original Medicare does for chemotherapy administration, chemotherapy drugs and radiation therapy, and in practice many plans charge right at that level: 20% of the cost. So a plan with a low monthly premium can still produce large bills in the first months of treatment, until you reach the out-of-pocket maximum.

The out-of-pocket maximum is the number that matters. Under CMS rules the in-network limit may be set no higher than $9,250 in 2026 and $9,850 in 2027, and on a PPO the combined in-network and out-of-network limit may be as high as $14,800 in 2027. Many plans set theirs lower. Whatever yours is, a cancer diagnosis means you should plan on reaching it. It is printed in your Evidence of Coverage, and next year’s figure is in the Annual Notice of Change letter that arrived this month.

It resets on January 1. Treatment that starts in October and runs through March crosses two calendar years, and you can owe the maximum twice within six months. Nobody chooses when to be diagnosed, but it is a reason to know the figure before you need it.

A network, and permission. The oncologist, the infusion center, the radiation clinic and the hospital all have to be in the plan’s network, or on a PPO you pay the higher out-of-network share. Plans commonly require prior authorization for chemotherapy and radiation as well. Since January 1, 2026, a plan must answer a standard request within seven calendar days and an urgent one within 72 hours, and a denial can be appealed. The networks explainer and the post on what to do when a doctor leaves your network both go further.

There is one place the two systems overlap. If you join a qualifying clinical trial while on an Advantage plan, Medicare’s booklet notes that certain aspects of clinical trials are covered by Original Medicare even though you are still in the plan. Ask the trial coordinator and the plan how the billing will run before you enroll.

Where north Peoria households actually get treated

The American Cancer Society estimates 44,620 new cancer cases in Arizona in 2026. In a city with as many households over 65 as Peoria, that is not an abstraction. Three local patterns decide how the coverage question plays out.

The drive is part of the treatment. Oncology practices, infusion centers and radiation clinics serving north Peoria cluster around Arrowhead and in Sun City and Sun City West. From Vistancia or Blackstone that is a real drive down Lake Pleasant Parkway or across Happy Valley Road, and radiation is often daily. On an Advantage plan the closest clinic and the in-network clinic are not always the same building. Along the Peoria–Glendale–Sun City seam, where plans differ by ZIP, two neighbors can find the same cancer center in one’s network and outside the other’s. Check by the name and location of the clinic, not the name of the health system.

Mayo Clinic is a Medicare question, not only a medical one. A lot of people who retire to north Peoria assume that a serious diagnosis means Mayo Clinic’s campus in northeast Phoenix, east along the 101. Mayo Clinic’s own insurance pages say it accepts Original Medicare and Medicare Supplements in Arizona, and that its Arizona campus is out of network for Medicare Advantage plans, with limited exceptions for some employer retiree group plans. Contracts change, so confirm with Mayo and with your plan before you rely on either answer. But if being treated there matters to you, that is a decision about your Medicare made years before anyone says the word cancer.

The summer address. Westbrook Village and Trilogy hold many part-year residents. An Arizona HMO covers emergencies and urgent care anywhere in the country, but chemotherapy is scheduled care, and scheduled care out of area is generally not covered. A diagnosis in May can mean choosing between treatment in Arizona through the summer or paying out of network at home. Original Medicare with a supplement pays an oncologist in Minnesota exactly as it pays one in Sun City. The post on using an Advantage plan in another state covers the travel rules, and the Peoria page says more about why this comes up so often here.

Can I change my coverage after a diagnosis?

Partly, and the limits are the reason to think about this while you are well.

You can change Advantage plans or return to Original Medicare during open enrollment, October 15 through December 7, and if you are already in an Advantage plan, again from January 1 through March 31.

You may not be able to buy a supplement. A Medigap policy is a separate application to a private insurer. Outside your first six months on Part B or a federal guaranteed issue right, the insurer in Arizona can ask health questions, and current cancer treatment is one of the most common reasons for a decline. Arizona has no birthday rule and no annual open window. Going back to Original Medicare without a supplement would put you back on 20% with no limit, which is worse than the Advantage plan you left. Switching from Medicare Advantage to Medigap in Arizona explains the guaranteed issue situations and the order to do things in: get approved first, disenroll second.

You can always change your Part D plan for the following year during open enrollment, and nobody can turn you down for a drug plan because of a diagnosis.

If you already hold a supplement, a diagnosis changes nothing. The policy is guaranteed renewable as long as you pay the premium, and the insurer cannot cancel it or change your benefits because you got sick.

What Medicare does not pay for

The medical bills are the part Medicare handles well. The costs around them are the part it leaves alone. The American Cancer Society lists what Medicare usually does not cover for cancer patients, and the list includes transportation to treatment, lodging during treatment, most nutrition supplements, and help at home that is not medical care. Long-term custodial care is excluded too, and the explainer on what Medicare does not pay for covers that ground.

For a household in north Peoria that list is mostly fuel, time and, for a spouse still working, lost income. For a part-year resident treated away from home it can include months of lodging.

This is the gap that cancer, heart attack and stroke policies are sold to fill, and since I am licensed to sell them you should hear the plain version. These policies are not Medicare and are not connected to it. They typically pay a lump sum of cash to you on a first diagnosis, and you spend it however you need to. They generally ask health questions and have to be in place before a diagnosis. Whether one makes sense depends on what you already carry. With Plan G, your medical exposure is already small and the policy would be covering travel and household costs. With an Advantage plan, the out-of-pocket maximum is a known figure you could owe in each year of treatment, and some households would rather insure that than hold it in savings. Others with the savings prefer to keep the premium. Either answer can be right. A hospital indemnity plan is a different tool for a different bill, and it does little for cancer care that is mostly outpatient.

What to check before December 7

Open enrollment runs October 15 to December 7. Nobody picks a plan expecting cancer, but it is the most expensive thing a plan is likely to be asked to do, so it is a fair test. With your plan documents out:

1. Find the in-network out-of-pocket maximum for 2027 in your Annual Notice of Change. That is your realistic cost for a year of treatment on an Advantage plan. Ask whether your household could pay it twice.
2. Find the line for Part B chemotherapy and radiation. If it says 20%, you now know what that means.
3. Look up the cancer centers you would want, by name and location, in the plan’s provider directory. Include the hospital. If the answer you want is Mayo Clinic, call Mayo’s insurance line and ask about your plan by its full name.
4. If you are away part of the year, ask what the plan covers for scheduled care in your other state. Emergencies are not the question.
5. If you are on Original Medicare with a supplement, there is little to check on the medical side. Review your Part D plan’s formulary and premium for 2027, because that is the part that changes every year.
6. If you are healthy and have wondered about a supplement, this is the time to ask, because the option may not be there later. The Advantage versus Medigap explainer sets out the trade, and the Medicare cost estimator puts rough numbers on both routes.

The short version

• Medicare covers cancer treatment. Part A covers inpatient care, Part B covers outpatient chemotherapy, radiation, doctor visits and scans, and Part D covers most cancer drugs taken at home.
• Original Medicare alone leaves you 20% with no annual limit on the outpatient side. A supplement such as Plan G pays it.
• Medicare Advantage plans often charge 20% on chemotherapy too, up to a yearly out-of-pocket maximum of no more than $9,250 in network in 2026 and $9,850 in 2027. It resets each January 1.
• Part D spending on covered drugs stops at $2,100 in 2026 and $2,400 in 2027.
• Where you can be treated depends on your coverage. Original Medicare works with any provider in the country that accepts Medicare. An Advantage plan works inside its network.
• After a diagnosis, moving to a supplement in Arizona is difficult. The decision is easier to make while you are well.

If you would rather have someone check it for you

If you or your spouse are in treatment now, the useful questions are narrow ones. Is the clinic in network for next year, is the drug on next year’s formulary, and what is next year’s maximum. That takes about twenty minutes with the plan documents, and there is no charge for the conversation. If you are healthy and simply want to know how your current coverage would behave, that is a good use of the same twenty minutes, and it is more useful before December 7 than after.

Bring your insurance cards, the Annual Notice of Change, a list of your prescriptions, and the names of any doctors or treatment centers you would want to keep. I am not a doctor and none of this is medical advice. Decisions about treatment belong with your oncologist. What I can do is tell you what your plan will and will not pay for once those decisions are made.

The office is in Anthem, roughly 25 minutes from north Peoria out the Carefree Highway and down Lake Pleasant Parkway, and most of this gets done by phone anyway. Call (602) 844-6002 or book a time — and if you call or text, that is your consent for me to reply the same way.