The short answer
It is normal to feel confused about what your health insurance covers. Learning a few key terms — copay, deductible, coinsurance — and calling your plan's benefits coordinator can help you avoid surprises. Explanation of Benefits forms are not bills. A social worker or your plan's case manager can help.
It is normal to feel confused about health insurance — you can ask for help.
A copay, a deductible, and coinsurance are three different kinds of costs to know.
Call your plan and review what is covered before your care begins.
An Explanation of Benefits (EOB) is not a bill — it is a summary from your insurer.
Choose how you want to understand this
The full explanation.
The simple version
It is completely normal to feel confused about what your health insurance covers. Insurance takes time and effort to understand, and doing it while you are going through cancer care can feel like a lot. The good news is that a few key ideas — and a phone call or two — can help you avoid surprises and feel more in control.
Start by calling your plan
The National Cancer Institute suggests calling your health insurance company and asking to speak with a benefits coordinator. Have your policy in hand. Ask which tests, treatments, and drugs are covered and which are not, and whether your plan will cover any specialists your doctor might refer you to.
Knowing what is covered before your care begins helps you plan ahead.
The words that describe your costs
Three terms describe most of what you may owe:
- A copay is the amount you pay for each service, such as an appointment or a prescription.
- A deductible is the amount you pay before your plan starts paying its share.
- Coinsurance is the percentage you pay after your deductible is met — for example, you pay 20% and your plan pays 80%.
It is worth asking whether copays are due up front and how much they cost, so you can plan for payment.
An EOB is not a bill
After a visit, your insurer sends an Explanation of Benefits (EOB). This form lists the services you received and how much your plan paid. An EOB is not a bill. A separate bill may come later from the hospital or doctor. Keeping your EOBs helps you check that your bills are correct.
When a treatment is not covered
Sometimes a doctor feels you need a test or procedure that your plan does not cover. Your doctor and the hospital billing department can help. Often the doctor will write a letter explaining why the care is needed, which you then send to the insurance company. If the plan still says no, you can go through its appeals process.
If the issue comes before treatment starts, it may be a prior authorization problem rather than a bill problem. If coverage is changing because of job loss or reduced hours, compare COBRA after a cancer diagnosis with marketplace, Medicaid, Medicare, or employer options before a deadline passes. If you are in Medicare Advantage, network rules and authorization requirements can shape where cancer care is covered.
Ask for a case manager
You can ask the insurance company to assign you a case manager. That way you can talk with the same person each time you have a question or concern, instead of starting over with someone new.
Medicare, Medicaid, and if you do not have insurance
For questions about Medicare, you can visit Medicare.gov or call 1-800-MEDICARE. For Medicaid, which is run by each state, you can visit Medicaid.gov. If you do not have insurance, HealthCare.gov lists coverage options. And if you cannot afford insurance and do not qualify for Medicaid or Medicare, you can ask hospitals and clinics about charity care and sliding-scale programs, where fees are based on your income.
You do not have to sort this out alone — a hospital social worker or financial counselor can help.
Protection from surprise bills
The No Surprises Act bans surprise bills for emergency services, and for other care you receive from out-of-network providers while you are in an in-network setting. It is one of the protections that can shield you from unexpected costs, so it is worth knowing about if a bill looks larger than you expected.
Ask how and when to pay
It also helps to ask your plan how you should pay your balance. For example, do you file a claim yourself? Does the insurance company pay the provider first? Or do you pay the bill and then get reimbursed? Knowing the process ahead of time prevents confusion later. For a plain-language refresher on how insurance works, trusted guides such as the Centers for Medicare & Medicaid Services' Coverage to Care and MedlinePlus can help.
A note before we begin
This information is educational and is not a substitute for medical, legal, or financial advice. For your own situation, talk with your care team, a hospital social worker, or a financial counselor.
Reviewed sources
This article is based on public information from the National Cancer Institute:
Work, coverage, and appeals
For coverage problems, see insurance denials and appeals, prior authorization, FMLA vs ADA, workplace accommodations, COBRA, and Medicare Advantage and cancer care.
Words to know
Tap any term to see what it means.

Common questions
What is a copay?
A copay is the amount you pay for each health care service, such as a doctor's appointment or a prescription. Your plan sets these amounts. It helps to ask whether copays are due up front and how much they are before your care begins.
What is a deductible?
A deductible is the amount you pay for your medical care before your health insurance plan starts to pay its share. Knowing your deductible ahead of time helps you plan for costs.
What is coinsurance?
Coinsurance is the percentage of a covered service that you pay after you have met your deductible. For example, you might pay 20% while your insurance pays 80%.
Is an Explanation of Benefits a bill?
No. An Explanation of Benefits (EOB) is a form from your insurance company that lists services you received and how much your plan paid. It is not a request for payment. A separate bill may come from the provider.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Your next step
One-pagers for tracking bills, calls, and questions.
Speak With Trained Specialists & Human Navigators
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Immediate emergency guidance for fever (>100.4°F during chemo), severe pain, or shortness of breath.
Help Us Improve This Guide
Did this explanation answer your question and help you determine your next step?
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Knowledge Check
0 of 4 answered
This self-assessment checks understanding of educational content only. It is not medical advice.
Where to get help with this, by name
A hospital social worker or financial navigator is the best first call if you have one. If you do not, these organisations help at no cost to you.
- Patient Advocate Foundation — (800) 532-5274. Case managers take on insurance appeals, denials and medical debt with you. Free.
- TotalAssist (Patient Advocate Foundation's copay programme, merged with the PAN Foundation in 2026) — 866-512-3861. Help with medication copays, coinsurance and deductibles, insurance premiums, and office-visit and administration charges on the day of treatment, across nearly 150 conditions.
- CancerCare — 800-813-HOPE (4673). Oncology social workers, free counselling and support groups. Limited financial help with transport, home care, child care and lodging for people in active treatment who meet their income guidelines — funding is first-come, first-served, so call to ask what is open.
- Triage Cancer — 424-258-4628. Free legal and financial navigation: insurance, employment rights, disability.
- Blood Cancer United (formerly the Leukemia & Lymphoma Society) — (800) 955-4572. Information Specialists answer questions on treatment, insurance and financial problems.
- HealthCare.gov — 1-800-318-2596. For questions about the external review process — the independent review your insurer is required by law to accept.
Your state Department of Insurance regulates insurers and takes consumer complaints. On Medicare, your State Health Insurance Assistance Program (SHIP) gives free one-to-one counselling. If a specific drug is the problem, ask the manufacturer about its patient assistance programme.
Phone numbers checked 31 July 2026. Programmes and eligibility change — if a number has moved, please tell us.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Sources last checked: 2026-07-21 what this meansLast updated: 2026-07-21Next planned review: 2027-01-21
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.
Related articles
- Understanding Your Medical Bills During Cancer Care
- Getting a Treatment Approved by Your Insurance
- Paying for Cancer Treatment: Insurance and Costs
- Medicare and Cancer: What Is Covered
- Prior Authorization for Cancer Treatment
- COBRA After a Cancer Diagnosis
- Medicare Advantage and Cancer Care
- Copay Cards and Cancer Medicines
Still have questions?
Educational answers, plain language
Free to print and share
