Appeal a Rejected Health Insurance Claim (UK, 2025): Templates & Evidence

Last updated: 29 September 2025

Short answer: If your health insurance claim is rejected, you can appeal by submitting evidence, citing your policy wording, and escalating to the insurer’s complaints team — and if unresolved, to the Financial Ombudsman Service (FOS). Most successful appeals hinge on clear medical evidence and showing the treatment is covered by your policy.

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Why claims get rejected (UK PMI)

• No pre-authorisation: Insurers refuse claims if you didn’t obtain an authorisation code first.
• Non-covered condition: Chronic or excluded conditions (e.g. fertility, cosmetic surgery).
• Out-of-network care: Using hospitals or consultants not on your insurer’s hospital list.
• Exceeding limits: Outpatient caps, excess, or outpatient limits.
• Incorrect referral type: Some insurers (like AXA) require an open referral, not a named consultant.

Step-by-step: how to appeal

1. Check your policy wording: confirm the treatment should be eligible.
2. Collect evidence: GP letters, consultant reports, discharge notes, invoices.
3. Write your appeal using the insurer’s process (often a form or email). Use plain English and reference policy terms.
4. Escalate internally: every insurer has a dedicated complaints team for second review.
5. Go external if needed: if rejected again, escalate to the Financial Ombudsman Service.

Appeal template (UK 2025)

Subject: Appeal against rejected claim [Claim Ref: XXXXX]

Dear [Insurer Claims Team],

I am appealing the rejection of my claim for [treatment] on [date]. 
According to section [X] of my policy, [treatment] should be covered. 
I have attached medical evidence from [GP/consultant], showing eligibility. 

Please review this decision. If further information is needed, let me know.

Kind regards,
[Your Name]
  

Tip: Keep your appeal polite, evidence-based, and policy-specific. Avoid emotion — stick to the facts.

When appeals succeed

• Errors in admin (wrong referral code, misclassified procedure).
• Clear evidence from a consultant showing the treatment is acute, not chronic.
• Pointing to insurer’s own published hospital list or benefits.

When appeals fail

• The condition is explicitly excluded (fertility, cosmetic, chronic diseases).
• You had no pre-authorisation or saw a non-approved consultant.
• The claim exceeded limits or was outside policy dates.

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Get a free health-insurance comparison — some providers handle appeals more fairly and process claims faster.

FAQs

How long do I have to appeal?

Most insurers give 6 months from the rejection date, but check your policy documents.

What evidence should I include?

GP referral letters, consultant reports, diagnostic results, and proof of pre-authorisation if applicable.

Does the Financial Ombudsman charge?

No — the service is free to consumers. Decisions are binding on insurers if upheld.

Do appeals hurt my renewal?

No — making or appealing a claim does not affect your renewal directly, though high claims history can impact premiums.

Next steps

• How to Claim on Bupa Health Insurance
• Switch Health Insurance (UK, 2025)
• Compare Health-Insurance Quotes

Disclaimer

Information only, not financial advice. Insurer claim and appeal processes vary. Always check your policy documents and contact your insurer before escalating.