Insurance Claim Denied in London, Ontario? How to Appeal

London, Ontario is home to Western University, University Hospital, and one of Ontario's largest healthcare workforces. Most residents rely on a combination of OHIP and employer-provided group benefits — and when those private benefits are denied, the financial impact can be severe. Ontario's Insurance Act and the Financial Services Regulatory Authority of Ontario (FSRA) provide real legal protections for claimants. This guide gives you a practical, step-by-step roadmap to appeal a denied insurance claim in London.

Why Insurers Deny Claims in London, Ontario

Insurance denials in Ontario follow predictable patterns regardless of whether you hold a group plan through an employer or an individual policy purchased privately.

"Not medically necessary" is the most common reason. The insurer's reviewer — often a nurse or physician who has never examined you — substitutes their judgment for your treating doctor's recommendation, citing internal clinical guidelines that may be more restrictive than Canadian Medical Association or Royal College standards.

Out-of-network provider. If you received care at a clinic or specialist not listed in the insurer's preferred provider directory, the claim may be denied or paid at a reduced rate, even if no in-network provider was reasonably available.

Missing or insufficient documentation. The insurer claims your physician's referral, clinical notes, or diagnostic results were not submitted or do not support the claimed service. Documentation disputes are among the most correctable denials.

Exclusion clause invoked. The insurer points to a policy exclusion — such as "pre-existing condition," "cosmetic procedure," or "experimental treatment" — to deny coverage entirely. Many exclusion clauses are narrower than insurers claim when the policy language is read carefully.

Late claim submission. Ontario group benefit policies often require claims within 90 to 365 days of the service date. Late submissions may be refused, though some plans allow exceptions with documented cause.

How to Appeal an Insurance Denial in London, Ontario

Step 1: Request the Full EOB)" class="auto-link">Explanation of Benefits and Denial Reason

Within days of receiving the denial, obtain a complete Explanation of Benefits (EOB) from your insurer. This document must specify the exact reason code and policy clause used to deny your claim. Under Ontario's Insurance Act (R.S.O. 1990, c. I.8), insurers are required to communicate claim decisions clearly and provide the basis for any rejection. Many initial denials lack sufficient detail — requesting the full EOB is the first step and often reveals a fixable error.

Step 2: Gather Comprehensive Clinical Documentation

Contact your treating physician or specialist at University Hospital, St. Joseph's Health Care London, or your family doctor's office. Request a detailed letter of medical necessity explaining why the denied treatment was clinically required, along with relevant diagnostic test results, imaging reports, and specialist notes. Ask your physician to reference applicable Canadian clinical practice guidelines — including Royal College of Physicians and Surgeons standards and any CMA policy statements relevant to your condition.

Step 3: Write a Formal Appeal Letter

Draft a formal written appeal addressed to your insurer's appeals or disputes department. State your policy number, member ID, claim number, and date of service. Identify the exact denial reason and explain specifically why it is incorrect. Reference the policy language you believe entitles you to coverage and attach all supporting clinical documentation. Request a written response within 30 days and send via registered mail, retaining a copy of everything you submit.

Step 4: Escalate Within the Insurer to a Senior Reviewer

If the first-level appeal is denied, most Ontario insurers offer a second-level internal review — sometimes called a reconsideration. Request escalation to a senior reviewer or the insurer's medical director. At this stage, a letter from your physician specifically addressed to the insurer's medical director, citing the clinical guidelines that support the denied service, can be especially persuasive. Document every communication with the insurer in writing.

Step 5: File a Complaint With FSRA

If the insurer's internal process fails, file a complaint with the Financial Services Regulatory Authority of Ontario (FSRA) at www.fsrao.ca or call 1-800-668-0128. FSRA regulates private health insurers in Ontario under the Insurance Act and can investigate whether your insurer acted improperly, failed to follow required claims procedures, or breached its duty of good faith. FSRA complaints are free and do not waive your other rights.

Step 6: Contact the OmbudService for Life and Health Insurance (OLHI)

OLHI is an independent, free dispute resolution service for life and health insurance disputes across Canada. It reviews complaints and issues recommendations that carry significant weight — most insurers comply even though OLHI cannot compel payment. Visit olhi.ca or call 1-888-295-8112. You can use OLHI after exhausting the insurer's internal process.

What to Include in Your Appeal

• Denial letter and complete Explanation of Benefits with specific denial codes
• Your insurance policy or group benefit booklet, with the relevant coverage provision highlighted
• Physician's letter of medical necessity referencing applicable Canadian clinical guidelines (Royal College, CMA standards)
• Clinical notes, lab results, imaging reports, and specialist letters from all treating providers
• Copies of all Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization correspondence and any referral letters

Fight Back With ClaimBack

A denied claim in London, Ontario does not have to be final. Whether your insurer invoked a "not medically necessary" clause or pointed to a policy exclusion, you have enforceable rights under Ontario's Insurance Act, FSRA oversight, and OLHI's independent review process. ClaimBack generates a professional appeal letter in 3 minutes, citing the specific Ontario policy language and Canadian clinical guidelines that apply to your case.

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Related Reading

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Internal vs External Insurance Appeal