Doctor's Letter for a Travel Insurance Claim: What It Must Say to Get Paid

Adam Z. Kawalek, MD

Published July 9, 2026 · 7 min read

You cancelled a trip because you were sick, and now your travel insurer wants proof. This is the moment most medical cancellation claims are actually won or lost — not at the illness, but at the paperwork. I'm Dr. Adam Z. Kawalek, a board-certified internist, and physician letters for cancelled trips are among the most common documents my practice issues. Here's exactly what your insurer needs to see, the timing rule almost nobody knows about, and the traps that get legitimate claims denied.

One caveat up front: every policy's wording is its own contract. The mechanics below reflect how the major US travel insurers work, but your policy document governs — read the certificate of insurance, not just the marketing page.

Why the airline won't refund you (and your travel insurance will)

Start with the fact that surprises most sick travelers: if you cancel a non-refundable ticket because you're ill, the airline owes you nothing. Under federal refund rules, cash refunds are required when the airline cancels or significantly changes your flight — not when you cancel a flight that operates as scheduled. Personal illness is not a refund event. (The one narrow exception: since the 2024 refund rule, carriers must issue travel credits valid for at least five years when a physician advises you not to fly because of a serious communicable disease during a public health emergency.)

That's the entire reason trip-cancellation insurance exists: it's the product that turns "medically unable to travel" into money back. If you're searching for a doctor's note hoping the airline will refund you, redirect that energy — the note's real job is powering your insurance claim, and the claim has rules of its own.

What trip-cancellation insurance actually covers

Standard trip-cancellation policies are "named peril" contracts: they reimburse 100% of your prepaid, non-refundable costs only when the cancellation happens for one of the specific covered reasons listed in the policy — and unexpected illness or injury of you, a traveling companion, or sometimes a close family member is the most-used covered reason in the category. Two conditions hide inside that sentence: the illness must be serious enough that a reasonable person would cancel, and a physician generally must advise the cancellation or confirm you were unfit to travel.

The upgrade tier — "Cancel For Any Reason" (CFAR) — skips the covered-reason test but only reimburses a portion of your costs (commonly 50–75%), typically must be purchased within a couple of weeks of your first trip deposit, and usually requires cancelling at least 48 hours before departure. If you're already sick and holding a standard policy, CFAR isn't your path; documentation is.

The 72-hour rule: see a physician before (or right after) you cancel

Here's the timing rule that quietly kills legitimate claims. Major insurers require the medical decision to come before the cancellation decision — Allianz's own guidance is explicit: a doctor should examine or consult with you and advise cancelling before you cancel, and if that's impossible, a doctor must examine or consult with you within 72 hours after the cancellation to confirm the decision. Allianz also expects you to notify your airline, cruise line, or tour operator within 72 hours of deciding to cancel, because insurers only reimburse the penalties that were unavoidable at that point.

Now put that next to reality: the average wait for a physician appointment in the US is around a month. A rule that demands physician contact within three days, and a healthcare system that offers appointments in thirty, is exactly the gap telehealth exists to close. An asynchronous physician review the same day you fall ill creates precisely what the policy asks for — a licensed physician consulted during the illness, on a documented date, before or immediately after the cancellation.

What the physician's letter must say

Claims examiners read hundreds of these. A letter that gets paid is not flowery — it's complete. Six elements, and if you're drafting a request to any physician, this is the checklist:

• Patient identification that matches the traveler on the booking — full name, and date of birth if your insurer's form asks for it.
• The date the physician evaluated you — this is what proves you met the before-or-within-72-hours timing rule. A letter reconstructed weeks later, describing an illness nobody examined, is the classic denial.
• A medical reason. Insurers are not employers: HIPAA's employer etiquette doesn't apply to a claim you're filing, and the examiner needs to see why travel was medically inappropriate — an acute illness line is usually sufficient, and you consent to what's disclosed.
• An explicit fitness statement — the sentence the claim actually turns on: the patient was medically unable to travel (or travel was medically inadvisable) for the affected dates.
• The affected date range, covering the departure you cancelled.
• Verifiable physician credentials — name, license state, NPI, and signature. Examiners check; letters that can't be verified get treated as letters that don't exist.

One more document to expect: many insurers have their own physician form — Travel Guard, for example, requires a completed Medical Certificate plus an Authorization for Release of Information for medical claims. Check your claim portal on day one: if a carrier form exists, it needs a physician's completion too, and the letter above becomes the supporting evidence alongside it.

The pre-existing condition trap

The most common denial in medical cancellation claims isn't fraud — it's the lookback. Insurers review a window of typically 60 to 180 days before your policy purchase date, and if the condition that cancelled your trip was diagnosed, treated, showing symptoms, or had medication changes inside that window, it can be excluded as pre-existing — even if you never saw it coming.

The escape hatch is the pre-existing condition waiver, which most major insurers offer only if you bought the policy within roughly 14–21 days of your first trip deposit. If you're reading this before your next trip: buy early, get the waiver. If you're reading this mid-claim: a new, unrelated acute illness — food poisoning, influenza, an injury — is not a pre-existing condition, and your physician letter should be precise about what the illness actually was.

Filing the claim: the complete checklist

Most insurers let you file online. Have all of it ready before you start:

• The claim form(s) from your insurer's portal, including their physician form if one exists.
• The physician's letter with all six elements above.
• Your trip itinerary and booking confirmations for every prepaid component.
• Proof of payment — receipts or card statements for the amounts you're claiming.
• Proof of non-refundability — the fare rules or cancellation-penalty schedule, plus documentation of any partial refunds or credits you already received (insurers reimburse the unrecoverable remainder, not the gross trip cost).
• Your deadlines, from your own policy. Policies state exact windows for notifying the insurer and submitting proof of loss. Find the dates, write them down, and treat them like flight times.

Where SickSlip fits

SickSlip's travel note is built for exactly this moment: a licensed physician reviews your case the same day — while the illness is current, inside the timing window that matters — and issues a signed letter with the evaluation date, a medical reason, an explicit unable-to-travel statement for your affected dates, and full physician credentials (NPI and state license), addressed to your carrier or insurer with your booking reference. Every letter carries a QR code that a claims examiner can scan to verify it was genuinely issued.

The honest limits: a physician letter documents your illness — it does not decide your claim. Coverage still depends on your policy's covered reasons, timing, and exclusions, and our physician declines requests that aren't clinically supportable (declined requests are refunded in full). That selectivity is precisely why the letters that are issued hold up under an examiner's scrutiny.

Frequently asked questions

Deciding whether to cancel in the first place, or wondering what airlines and hotels will refund on their own? Start with our full guide: how to get a doctor's note for a cancelled flight, hotel, or travel insurance claim.

Policies differ, and your certificate of insurance is the governing document — the timing windows, covered reasons, and deadlines described here are common patterns among major US travel insurers, not a promise about your policy. Verify the specifics with your insurer before relying on them. Nothing here is legal or insurance advice.

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.