There is a formal ladder, it is free, and the deadline that matters is six months from the insurer's final response.
What the policy documents actually say
Start with the insurer's own complaints procedure. Every FCA-regulated firm must have one and must respond within eight weeks. Ask specifically for the clause the decision relies on, in writing — most declines turn on a definition rather than on facts, and you cannot argue a definition you have not been shown.
If the answer is unsatisfactory or eight weeks pass, the Financial Ombudsman Service will consider it. Referral is free to you, and you have six months from the insurer's final response letter to make it. Miss that window and the Ombudsman generally cannot help.
Before escalating, check which of three things is actually being said. That the condition is pre-existing, that it is chronic, or that the treatment or provider was outside the terms. They call for completely different evidence: medical records for the first, a clinical opinion on prognosis for the second, and the authorisation trail for the third.
Authorisation disputes are the most winnable. If the insurer confirmed cover before treatment, say so and produce the reference. Bupa, for instance, tells members it will confirm special conditions in writing, which means there is a document to point at.
Check the firm on the Financial Services Register before you start, and keep everything in writing. Phone calls are recorded by the insurer, not by you.
Questions to put to the insurer or broker
- Which exact policy clause is the decline based on?
- Is this a pre-existing, chronic or authorisation decision?
- Has a final response letter been issued, and when?
Related questions
- Can I add my partner, child or parent to my policy?
- Is company-paid private health insurance taxed as a benefit in kind?
- Does private health insurance cover A&E or an emergency?
- Will private health insurance pay for cosmetic surgery?
Sources
- Source: Bupa policy guide — Bupa By You health insurance (BINS 14718) (2024), read 4 September 2026.
The limit behind every answer here
None of this reaches a condition you already have. Cover is written for problems that arise after it starts, so anything you have symptoms of when you apply is excluded — permanently under full medical underwriting, or until a symptom-free period has passed under a moratorium. Chronic conditions are excluded by every insurer whose wording we hold. Figures quoted come from current policy documents and change at renewal, so check the document you are actually offered.
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