The short answer
If your doctor recommends a test or treatment your plan does not cover, your doctor and the hospital billing team can help you seek approval, often with a letter explaining why the care is needed. If the plan still says no, you can use its appeals process.
Start by learning which tests, treatments, and drugs your plan covers.
If care is not covered, your doctor can write a letter explaining why it is needed.
You submit that letter to the insurance company to ask for approval.
If the plan still says no, you can go through its appeals process.
Choose how you want to understand this
The full explanation.
The simple version
Sometimes a doctor recommends a test or treatment that your insurance plan does not cover. That can feel discouraging. It is not always the end of the road. There are clear steps you can take to ask your plan to approve the care. And there are people whose job is to help you take them.
First, find out what is covered
Before care begins, it helps to know what your plan covers. The National Cancer Institute suggests calling your insurance company and asking for a benefits coordinator.
Ask which tests, treatments, and drugs are covered. Ask whether your plan will cover specialists your doctor refers you to. Knowing this early means fewer surprises.
Getting approval before treatment
Your doctor may feel you need a test or procedure that your insurance does not cover. Your doctor and the hospital billing department can help you take the steps to seek approval. This means asking your plan, ahead of time, to agree to cover the care.
Your doctor's office and billing team are your partners in getting care approved.
The role of your doctor's letter
A common step is for your doctor to write a letter stating why the test or procedure is needed. You then send this letter to the insurance company. The letter helps the plan understand why your doctor believes the care is important for you.
If the answer is still no: appeals
The company may still not agree to cover the treatment or procedure. If so, you can go through its appeals process. That is the set of steps a plan offers for asking it to think again.
Your plan materials and any denial letter explain how appeals work, including deadlines to meet. Keep copies of everything you send and receive. It makes this easier.
That internal appeal is not the end of the road. This is the part people most often do not know about.
The insurance company does not get the last word
If the internal appeal fails, you can take the decision to a reviewer outside the insurance company. HealthCare.gov sets out how this works for most private and Marketplace plans:
- You must file a written request for external review within four months of receiving the final determination from your insurer. Missing that window is the most common way this right is lost.
- A standard review is decided no later than 45 days after the request is received. An expedited review, for urgent situations, is decided no later than 72 hours — sooner, depending on medical urgency.
- "Your insurer is required by law to accept the external reviewer's decision." That sentence is the reason this step matters more than any other.
- Under the federal process there is no charge. Where a state process or independent review organization is used, any fee cannot exceed $25.
- You can appoint a representative to file it for you. That can be your doctor.
Medicare, Medicaid, VA coverage and some self-funded employer plans run their own appeal systems. The names, stages and deadlines differ. Check which one you are in before you rely on any particular date.
For the full step-by-step, including the peer-to-peer call that often resolves things earlier, see what to do when insurance denies cancer treatment.
Who can help
You do not have to manage this alone:
- your doctor's office can provide medical information and write letters
- the hospital billing department can explain the steps
- a hospital social worker or financial counselor can help you understand your options and prepare paperwork
Your state's Consumer Assistance Program or Department of Insurance can also help you file an internal appeal or an external review, at no cost.
A denial is not always the final word — asking for help early makes the next steps clearer.
Ask for a case manager
You can ask your insurance company to assign you a case manager. Then you speak with the same person each time you call about approval or coverage. You do not have to explain your situation from the start to someone new. It can make a slow process feel a little more manageable.
Keep good records along the way
Keep copies of everything you send and receive, whether you are seeking approval or filing an appeal. Note the details of your phone calls too: who you spoke with, the date, and what they said.
If a claim is denied, your denial letter will explain the reasons and the steps to appeal, including deadlines to meet. Good records make each step easier. They also help you keep track of what is due when.
A note before we begin
This information is educational. It is not a substitute for medical, legal, or financial advice. For your own situation, talk with your care team, your plan, or a hospital social worker.
Reviewed sources
This article is based on public information from the National Cancer Institute and HealthCare.gov:
Words to know
Tap any term to see what it means.
Common questions
What if my insurance will not cover a treatment my doctor recommends?
Your doctor and the hospital billing department can help you take steps to get it covered. Often the doctor writes a letter stating why the test or procedure is needed, which you submit to your insurance company. If the company does not agree, you can go through its appeals process.
What goes in the doctor's letter?
The letter explains why your doctor believes you need a test or procedure that your plan does not currently cover. It is part of asking the insurance company to approve and pay for the care.
What happens if the plan still says no?
You can use the plan's appeals process to ask it to reconsider. Reading your plan materials and any denial letter will explain the steps and deadlines to follow.
Who can help me with this?
Your doctor's office and the hospital billing department can guide you. A hospital social worker or financial counselor can also help you understand your options and prepare paperwork.
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.
Last updated: 2026-08-18Next planned review: 2027-01-14
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
Still have questions?
Educational answers, plain language
Free to print and share