Medical Letter for a Cruise Cancellation: How to Get Your Money Back When You're Too Sick to Sail

Adam Z. Kawalek, MD

Published October 9, 2026 · 5 min read

A cruise is one of the few trips where the money is gone long before you leave. Most lines take final payment 60 to 120 days out, and from that point the cancellation penalty climbs until, in the last two weeks, the fare is fully forfeited. Fall ill in that window and you are looking at a four-figure loss. There is a way back, but it runs on paperwork, and the single most important piece of it is a letter from a physician written while you are actually sick. This guide covers what the cruise line will and will not do, what your travel insurance needs, and what the letter has to say.

If you came here for a physician-signed doctor's note online, SickSlip issues them; what follows is the guidance.

What the cruise line itself will do

Less than most people hope. Cruise fares are sold under a penalty schedule, and illness is not an exception to it. Carnival, Royal Caribbean, Norwegian, Princess, Celebrity and the rest point sick passengers to two places: the line's own cancellation-protection plan, if you bought one, and third-party travel insurance. Without either, a cancellation inside the penalty window is handled by the schedule, not by your circumstances.

That said, it is worth asking. Cruise lines do, case by case, issue a future cruise credit for a documented medical cancellation, especially for loyal guests or when the illness is clearly serious. A credit is not cash, it usually has an expiry, and it is granted at the line's discretion. A physician's letter is what makes the request credible. Submit it through the line's guest-relations channel, in writing, and keep the reply.

Port fees, taxes, and most prepaid extras such as excursions, drink packages and specialty dining are refundable on cancellation regardless of the fare penalty. Make sure those come back to you even if the fare does not.

Where the money actually comes back: your insurance

If you bought the cruise line's cancellation plan or a separate travel insurance policy, illness of you, a travelling companion or a close family member is the most common covered reason for trip cancellation. These policies reimburse the non-refundable part of your fare, but only when the file proves two things: that you were medically unable to travel, and that a physician said so at the time.

Both kinds of plan want the same core document, a physician's letter, and many also want their own medical certificate completed by the physician. Check the claim portal on day one and download every form it lists. The letter below is the foundation either way.

The timing rule that decides most cruise claims

Insurers expect the medical decision to come before, or immediately after, the cancellation decision. The common standard is that a physician examines or consults with you and advises against travel before you cancel, or within about 72 hours afterward if that was not possible. A letter dated two weeks after the sailing, from a physician who never saw you around the sailing date, is the most common reason cruise claims are denied.

This is where cruise cancellations are harder than flights. People get sick a few days before sailing, spend those days hoping to recover, cancel at the last minute, and only then think about documentation. Reverse the order. The moment it is clear you are too ill to sail, get evaluated, then cancel, then file.

What the medical letter must say

• Your full name, matching the passenger name on the booking.
• The date the physician evaluated you, which is what satisfies the timing rule above.
• A clear statement that you were medically unable to travel, or that travel was medically inadvisable, for the sailing dates. Name the dates.
• A medical reason. Unlike an employer, an insurer is entitled to know why. An acute illness stated in one line is enough; a full history is not needed.
• The physician's name, state license number, and signature, with a way for the examiner to verify the letter. Letters that cannot be checked are treated as if they do not exist.
• The cruise line's name and your booking number, if the letter can carry them. Optional, but it ties the document to the claim.

If your insurer has its own physician certificate, it will ask for more than a letter does: onset date, whether the condition existed before you bought the policy, and the physician's own assessment. That form has to be completed by a physician who has seen you, and it is a different service from a signed letter.

The pre-existing condition problem

Cruise passengers skew older, and this is where cruise claims most often fall apart. Insurers look back 60 to 180 days before the policy purchase date; if the condition that stopped you sailing was diagnosed, treated, symptomatic, or had a medication change in that window, it can be excluded as pre-existing. The waiver that removes this exclusion is usually only available if you bought the policy within two or three weeks of your first deposit.

A new, unrelated illness such as influenza, a stomach virus, or an injury is not pre-existing. That is why the letter should name the acute condition precisely rather than describe vague symptoms.

If you are already on board

Illness during the cruise is a different claim: trip interruption rather than trip cancellation. The ship's medical center will document any visit, and that record is what the insurer wants for missed days, an early disembarkation, or a flight home. A letter from an outside physician is rarely needed for an on-board illness. Keep every receipt from the ship's clinic.

A step-by-step order of operations

• Get evaluated the day you realise you cannot sail. Same day or next day. The timing rule starts here.
• Cancel the cruise in writing and keep the confirmation. A no-show is harder to recover from than a cancellation.
• Ask the cruise line for a future cruise credit on medical grounds, attaching the letter. The answer may be no; the ask costs nothing.
• Open the insurance claim and download every form it lists, including any physician certificate.
• Submit the letter, the forms, the booking, proof of payment and proof of what was not refunded. Insurers reimburse the unrecoverable part, so include the refund of port fees and extras you did receive.
• Watch the deadlines in your policy. Both the notification window and the proof-of-loss window are fixed dates. Treat them like the sailing time.

What a SickSlip travel note is, and is not

A SickSlip travel note is a physician-signed letter stating you were medically unable to travel on your booked dates, with the evaluation date, a medical reason, the physician's name and state license, and a verification code the examiner can check. It can be addressed to your cruise line or insurer and carry your booking number. It costs $39.99 and is issued the same day; over the last three months the typical request was signed in under 20 minutes. It is not a completed insurer medical certificate, and it is not a fitness-to-sail clearance, which says the opposite.

For the insurance side in more depth, read what a travel-insurance claim letter must say. If flights were booked separately from the cruise, the flight refund guide covers how airlines handle a documented illness, and the cancelled-trip guide covers hotels and the rest.

A final word from the physician

Sailing sick is miserable for you and a genuine problem for everyone else on a closed ship, which is why every cruise line has a health screening at the pier. Staying home is the right call. Make it a documented call: get seen while you are unwell, get the letter to say the dates and the fact that you could not travel, and file in the right order. The claims I see denied are almost never about the illness. They are about a letter that came too late or said the wrong thing.

Adam Z. Kawalek, MD

Board-Certified Physician · Founder, SickSlip · Cedars-Sinai · Johns Hopkins

Dr. Kawalek is a hospitalist physician with 15+ years of clinical experience. He founded SickSlip to give patients fast, affordable access to legitimate medical documentation without unnecessary clinical barriers.