How to get a second opinion on a cancer diagnosis

Short answer: Ask your current doctor's office for a copy of your pathology report, imaging on disc or via portal download, and your treatment plan; call an NCI-designated cancer center and ask for a "new patient second opinion" appointment; confirm with your insurer that the visit is covered (most plans cover second opinions, and Medicare does). For most cancers, taking one to two weeks to do this does not change your outcome — but ask your oncologist that question directly before you schedule.

Asking for a second opinion feels like an accusation. It isn't. Oncologists request them for their own family members. At academic cancer centers, reviewing outside cases is a routine part of the week — there is a whole workflow built for it, which tells you how normal it is.

Here's how to actually do it.

When a second opinion matters most

• The diagnosis itself is uncertain. Rare cancers, unusual pathology, or a report with hedging language ("consistent with," "cannot exclude").
• Surgery is being proposed. Surgical decisions are hard to undo.
• There is more than one reasonable treatment path. If your doctor says "we could do A or B," a second reader may weigh them differently.
• You were told there are no options. Second opinions at large centers most often change things here — through clinical trials that community practices don't run.
• You don't feel heard. That's a legitimate reason on its own.

Studies of second opinions in oncology consistently find that a meaningful minority of cases come back with a changed diagnosis, stage, or recommended treatment. Most of the time the second opinion confirms the first — and that confirmation is worth having too, because it lets you start treatment without a lingering doubt.

Step 1 — Ask the time-sensitivity question first

Before anything else, ask your oncologist: "If I take two weeks to get a second opinion, does that change my outcome?"

For most solid tumors the honest answer is no. For acute leukemias, aggressive lymphomas, spinal cord compression, and some obstructive cancers, the answer can be yes. You need that answer from a clinician, not from the internet — and asking it directly usually gets a straight response.

Step 2 — Gather your records

Call your doctor's medical records office and request:

• The pathology report (and ask that the actual tissue blocks or slides be made available to send — the second center's pathologist will want to re-read the tissue, not just the report)
• Imaging on CD or via portal download — actual image files, not just the radiologist's written report
• Lab work from the last six months
• The treatment plan or consultation note from your oncologist
• Your operative report, if you've had surgery

Records offices can take a week. Start this on day one, in parallel with booking the appointment. Ask for a patient copy for yourself as well — you'll want it repeatedly.

Step 3 — Pick where to go

• NCI-designated cancer centers — there are just over 70 in the US, and they see rare presentations often enough to recognize them. Find the nearest one at cancer.gov.
• A large academic hospital in your state, if no NCI center is close.
• A remote/virtual second opinion program — Mayo Clinic, Cleveland Clinic, Dana-Farber, MD Anderson and others run programs where you submit records and receive a written opinion without traveling. Cost typically runs several hundred to a couple thousand dollars, sometimes insurance-billable.

When you call, use the phrase "I'd like to schedule a new patient second opinion consultation." That phrase routes you correctly.

Step 4 — Check coverage before the visit

Call the number on the back of your insurance card and ask:

• Is a second opinion consultation a covered benefit under my plan?
• Is center namein network for a consultation, and is that different from being in network for treatment?
• Do I need a referral or prior authorization?
• What's my out-of-pocket for a specialist consult?

Medicare covers second opinions for medically necessary surgery or treatment, and will cover a third opinion if the first two disagree. Many commercial plans do too — some actively encourage it.

Step 5 — What to bring and ask

Bring the records, a written list of questions, and someone else's ears. Then ask:

• Do you agree with the diagnosis, stage, and grade? Did your pathologist re-read my slides?
• Would you recommend the same treatment plan? If not, what would you do differently and why?
• Are there clinical trials here that I'd qualify for?
• If I get treated closer to home, will you co-manage or advise my local team?
• What would you do if this were your family member?

That last question isn't sentimental — it often produces the most direct answer of the visit.

What a second opinion is not

It's not a betrayal of your first doctor, and you don't have to tell them in a delicate way — "I'd like to get a second opinion, can your office help me get my records?" is a complete sentence. It's also not a guarantee of a better answer. Two experts can look at the same tumor and reasonably disagree. If they do, ask each of them to explain why they'd choose their path, and consider a third read.

Turning the two opinions into a decision

When you have both, put them side by side: what's the same, what's different, and what does each doctor say the tradeoffs are. If you want help doing that, you can paste both reports into Cura and get a plain-language comparison plus the follow-up questions to bring back — nothing you upload is saved.

Related reading: questions to ask after any new diagnosis, how to read a pathology report, and what happens while you wait for results.