Medibank Private Health Insurance Claim Denied — How to Appeal

Medibank Private is Australia's largest private health insurer, covering more than 3.7 million people across hospital and extras policies. Being the biggest does not make them infallible — Medibank denies thousands of claims every year, and many of those denials are overturned when members push back. If Medibank has denied your claim, you have clear rights and a defined path to challenge that decision.

Why Medibank Denies Claims

Understanding the reason behind a denial is the first step toward building a successful appeal. Medibank's most common denial categories include:

Pre-existing condition exclusions. If you were diagnosed with or showed symptoms of a condition before joining Medibank, your fund can apply a 12-month waiting period before covering treatment. Medibank may commission a medical assessment to determine whether a condition is pre-existing. These assessments are conducted by a medical practitioner appointed by the fund — not an independent specialist — and can be challenged.

Waiting periods not yet served. Standard waiting periods under the Private Health Insurance Act 2007 (Cth) are 2 months for most conditions, 12 months for obstetric services, and 12 months for pre-existing conditions. If you upgraded your cover and haven't served the new waiting period, Medibank will decline claims that fall under the upgraded tier.

MBS item number not covered. Medibank's benefits are linked to Medicare Benefits Schedule (MBS) item numbers. If your procedure was billed under an item number that sits outside your policy tier, Medibank can decline to pay. This is common with newer surgical techniques that have been assigned different MBS codes than their traditional equivalents.

Gap cover disputes. Under hospital cover, Medicare pays 75% of the MBS fee for in-hospital procedures. Medibank is expected to cover the remaining 25% (the Medicare gap) plus any agreed "known gap" amount. If your specialist charged above the known-gap arrangement or was not on Medibank's participating specialist list, you may have received a large out-of-pocket bill and a partial or declined benefit from Medibank.

Extras benefit limits reached. Extras claims for dental, optical, physiotherapy, and similar services are subject to annual benefit limits. Medibank will decline claims once your limit is exhausted, even if the treatment is clinically appropriate.

Step 1 — Request a Full Written Explanation

Call Medibank on 1300 722 568 and ask for a detailed written explanation of the denial. Under the Private Health Insurance Act, Medibank must tell you the specific policy clause or rule that supports the denial. Keep a record of every conversation — date, time, name of the representative, and what was said.

Ask specifically whether the denial is based on:

• A waiting period (and confirm the exact start date of your cover)
• A pre-existing condition assessment
• An MBS item number exclusion
• A product tier exclusion

Each of these has a different appeal pathway.

Step 2 — Lodge a Formal Internal Complaint

Medibank has a dedicated complaints process. You can:

• Call 1300 722 568 and ask to speak to the complaints team
• Write to Medibank at GPO Box 9999, Melbourne VIC 3001
• Submit online through Medibank's website member portal

Your complaint should include your member number, the date of service, the amount claimed, the denial reason you were given, and your argument for why the denial is wrong. Attach any supporting documents — specialist letters, GP referrals, pathology reports, or MBS item descriptions.

Medibank is required to acknowledge your complaint within 2 business days and respond substantively within 10 business days under the Private Health Insurance (Accreditation) Rules 2011.

Step 3 — Escalate to the PHIO

If Medibank's internal complaint response does not resolve the issue, your next step is the Private Health Insurance Ombudsman (PHIO). The PHIO is a free, independent government body that handles disputes between members and private health insurers.

Contact PHIO:

• Website: phio.org.au
• Phone: 1800 640 695
• Online complaint form available at phio.org.au/make-a-complaint

You must have attempted to resolve the complaint with Medibank first. The PHIO will contact Medibank on your behalf, review the evidence, and make a determination. Most PHIO complaints are resolved within 30 to 60 days. The PHIO has the power to recommend Medibank reverse their decision, and for systemic issues can issue binding directions.

What the PHIO Commonly Finds in Pre-Existing Condition Cases

Pre-existing condition disputes are among the most frequently upheld complaints at the PHIO. The key issue is whether the medical practitioner who assessed your condition used the correct legal definition — that a "reasonable person" in your position would have been aware of the signs and symptoms before you joined. If you had no symptoms, no diagnosis, and had not sought treatment, a pre-existing determination can be overturned.

Request a copy of the medical practitioner's report from Medibank. Your own GP or specialist can then provide a letter challenging the findings.

Your Rights Under Australian Consumer Law

The Australian Consumer Law (ACL) applies to private health insurance policies. If Medibank has misrepresented what your policy covers — for example, a sales consultant told you a procedure was covered when it was not — you may have a remedy under ACL provisions on misleading and deceptive conduct. This is separate from the PHIO pathway and can be raised with the ACCC.

Fight Back With ClaimBack

A Medibank denial is not final. With the right documentation and a clearly structured appeal, members overturn decisions regularly — and the PHIO exists specifically to hold insurers accountable when they get it wrong.

Start your free appeal →

Related Reading

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Insurance Ombudsman Guide