What Medicare Part D covers for chemotherapy

Medicare Part D covers many chemotherapy drugs, but not all of them, and coverage depends on which plan you choose and which drug your doctor prescribes. Part D is prescription drug coverage, so it pays for drugs you take by mouth or inject at home. It does not cover chemotherapy drugs given to you in a hospital or cancer center — those are covered under Medicare Part B instead, which pays for outpatient services and infusions.

The drugs Part D covers are listed in a document called a formulary. Each insurance company that offers Part D creates its own formulary, which means the same drug might be covered by one plan and not another. Your plan's formulary also sorts drugs into tiers, and your out-of-pocket cost depends on which tier your drug is on. A drug on tier 1 costs less than one on tier 3 or tier 4.

If your doctor prescribes a chemotherapy drug that is not on your plan's formulary, you have options: you can switch to a different Part D plan during the annual enrollment period, ask your doctor to prescribe a different drug that is covered, or request that your plan make an exception and cover the drug anyway.

Key Takeaways

  • Medicare Part D covers oral and injectable chemotherapy drugs you use at home, but not infusions given in a hospital or cancer center.
  • Each Part D plan has its own formulary listing which drugs are covered, and the same drug may be covered by one plan but not another.
  • You can request a formulary exception if your doctor prescribes a drug not on your plan's list, and your plan must respond within 72 hours.
  • If your drug costs more than $1,000 per month, you may reach the catastrophic coverage phase where Medicare pays 80 percent of the cost.
  • Talk to your oncologist before enrollment or if your drug is not covered, because they often know which plans cover the drugs they prescribe most.

The difference between Part B and Part D chemotherapy coverage

This distinction matters because it changes where you get your drug and who pays. Part B covers chemotherapy infusions — the drugs a nurse or doctor administers to you in an infusion center, hospital outpatient department, or doctor's office. You pay a copay (usually $20 to $50 per visit) and Part B covers the rest. Part B also covers the drugs themselves, the IV supplies, and the nurse's time.

Part D covers chemotherapy you take at home — pills you swallow or injections you give yourself. You pay based on your plan's tier system and your deductible. Some newer cancer drugs are oral or self-injected, which is why Part D coverage matters. If your doctor wants to switch you from an infusion to an oral drug to reduce office visits, that switch moves you from Part B to Part D, and your costs may change.

A few chemotherapy drugs can be given either way. For example, some patients receive methotrexate as an infusion (Part B) and others take it as a pill (Part D). Ask your oncologist which route they recommend for you and whether your insurance covers it.

How to learn about your chemotherapy drug is covered

The fastest way is to call your Part D plan's customer service number, which is on your insurance card. Have your prescription ready and tell them the drug name, dose, and how often you take it. They will tell you whether it is on the formulary, what tier it is on, and what your copay will be. This call takes five to ten minutes and saves you from finding out at the pharmacy.

You can also search your plan's formulary online. Most insurance companies have a searchable tool on their website where you type in the drug name and see the tier and any restrictions. The tool also shows whether your doctor needs to get prior authorization — permission from the insurance company before they fill the prescription.

If you do not yet have a Part D plan, your oncologist's office can tell you which plans cover the drugs they prescribe most often. Many cancer centers keep a list of Part D plans by drug, updated each year. This is worth asking about during your first visit, because choosing a plan that covers your specific drug can save you hundreds of dollars per month.

Prior authorization and step therapy for cancer drugs

Some Part D plans require prior authorization before they will pay for a chemotherapy drug. This means your doctor's office has to contact the insurance company and get written permission before the pharmacy fills your prescription. The insurance company reviews your medical records to confirm that the drug is medically necessary for your condition. This usually takes one to three business days.

A few plans also use step therapy, which means you have to try a cheaper drug first, and only if that drug does not work can you move to the one your doctor prescribed. Step therapy is less common for chemotherapy than for other drugs, but it does happen. If your plan requires step therapy and your doctor believes it is not safe or appropriate for you, they can request an exception.

Ask your doctor's office to handle prior authorization and step therapy requests — they have staff trained to do this and know how to present your case. Do not wait until you are ready to fill the prescription; ask about these requirements when your doctor first prescribes the drug.

What happens when your chemotherapy drug costs more than the coverage limit

Part D has a yearly coverage structure with four phases. Once you and your plan have paid a certain amount out of pocket (the threshold changes each year), you enter the catastrophic coverage phase. In this phase, Medicare pays 80 percent of the cost of your drugs and you pay 20 percent. This phase protects you if your chemotherapy is very expensive.

Some chemotherapy drugs cost $3,000 to $10,000 per month or more. If your drug is that expensive, you will likely reach catastrophic coverage within a few months. Once you do, your monthly costs become predictable: you pay 20 percent of the drug's cost, and Medicare covers the rest. This is actually when Part D becomes most valuable for people with cancer.

Ask your pharmacist or insurance company to estimate when you will reach catastrophic coverage based on your drug's cost. Knowing this helps you plan your budget and understand when your out-of-pocket costs will drop.

Switching Part D plans if your drug is not covered

If your current Part D plan does not cover your chemotherapy drug, you can switch plans during the annual enrollment period, which runs from October 15 to December 7 each year. Your new coverage starts January 1. If you are newly diagnosed with cancer or your doctor just prescribed a new drug outside the enrollment period, you may be able to switch plans right away under a special circumstance called a may have access to life event. Cancer diagnosis qualifies.

To switch, contact Medicare at 1-800-MEDICARE or go to Medicare.gov and use the plan finder tool. Enter your chemotherapy drug and the tool will show you which plans cover it and what your costs will be. Compare at least three plans — the cheapest plan is not always the best if it has a high copay for your specific drug.

If you switch plans, make sure your new plan's formulary is current. Formularies change every year on January 1, so a plan that covers your drug this year might not cover it next year. When you enroll, ask the plan in writing to confirm coverage for your specific drug and dose.

Requesting a formulary exception

If you like your current Part D plan and do not want to switch, you can ask the plan to cover a drug that is not on its formulary. This is called a formulary exception or coverage exception. Your doctor submits a written request explaining why this specific drug is medically necessary for you — for example, because you had a bad reaction to the drugs the plan does cover, or because clinical evidence shows this drug works better for your type of cancer.

The plan must respond within 72 hours. If they say no, you can appeal. Your doctor can also request an expedited (faster) review if you need the drug urgently. Many plans approve exceptions for chemotherapy drugs when a doctor provides medical justification, because denying cancer treatment creates liability.

Do not assume your plan will say no. Ask your oncologist to submit the request — they know how to write it in a way that addresses the plan's concerns. Keep copies of all correspondence with your insurance company in case you need to appeal.

Frequently Asked Questions

Does Medicare Part D cover the cost of chemotherapy infusions?

No. Infusions given in a hospital or cancer center are covered by Medicare Part B, not Part D. Part D covers only chemotherapy drugs you take at home — pills or injections you give yourself. If your oncologist recommends switching from an infusion to an oral drug, that move changes your coverage from Part B to Part D.

What if I cannot afford my copay for chemotherapy?

Ask your oncologist's office about patient information programs run by the drug manufacturer. Many pharmaceutical companies offer free or reduced-cost drugs to patients whose income is below a certain level, regardless of insurance. Your social worker or financial counselor at the cancer center can help you explore. Some nonprofits also help pay copays for cancer drugs.

Can I use a GoodRx coupon or discount card instead of my Part D plan?

Sometimes a discount card is cheaper than your Part D copay, but using it means the cost does not count toward your Part D deductible or out-of-pocket maximum. For expensive chemotherapy drugs, this usually costs you more in the long run. Ask your pharmacist to compare the Part D copay and the discount price before you decide.

What if my doctor prescribes a brand-name chemotherapy drug but my plan only covers the generic?

Ask your doctor whether the generic version works the same way for your type of cancer. If it does, switching to the generic saves money. If your doctor believes the brand-name drug is medically necessary, they can request a formulary exception or prior authorization to override the plan's preference for generic.

Do I have to tell my Part D plan about my cancer diagnosis?

You do not have to, but it can help. Some plans have disease management programs for cancer patients that offer support, education, or copay information. When you call to ask about your drug's coverage, you can mention your diagnosis and ask whether the plan offers any programs that might help.