What is the 5-year moratorium rule in health insurance?

After five continuous years of coverage, an insurer cannot reject your claim for non-disclosure or misrepresentation, except in cases of proven fraud.

How does IRDAI define a pre-existing disease now?

It is any condition diagnosed or treated within 36 months before the policy starts. Anything diagnosed later is generally not a PED.

Can an insurer reject my claim if I didn't know I had a condition?

No. Non-disclosure requires knowledge. If there is no prior medical record or diagnosis, the condition is considered unknown and should be covered.

What should I do if my claim is rejected for non-disclosure?

Check your first diagnosis date, review your proposal form, and file a formal grievance with the insurer or the Insurance Ombudsman.

Does the moratorium period reset if I port my policy?

No. As per IRDAI rules, the time you spent with your previous insurer counts towards the 5-year moratorium period when you port.

Who has to prove that a condition was hidden?

The insurance company bears the burden of proof. They must provide documented evidence that you knew about the condition before buying the policy.

How to Prove a Medical Condition was Unknown for Insurance Claims

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The Non-Disclosure Defense: How to prove a medical condition was unknown

Your claim shouldn't be rejected for a disease you didn't know you had. Here is how to use the law to protect your health insurance.

4 min read

OneAssure Team

April 05, 2026

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Looking for the right plan? You don't have to guess. Let us compare the fine print for you and give you an unbiased recommendation.

Your claim was rejected. Now what?

Imagine you are 30, working a high-pressure job in Bengaluru, and suddenly need gallbladder surgery. You have paid your premiums for three years. You think you are safe. Then comes the shocker: the insurer rejects your claim. Their reason? Non-disclosure of a pre-existing condition. They claim you had this issue before buying the policy and hid it. But here is the catch: you truly had no idea. You never had pain, never saw a doctor for it, and never took a single pill. This is the Non-Disclosure Defense. It is your right to prove that a condition was unknown to you at the time of purchase.

The 5-year shield you need to know

One of the biggest changes in Indian insurance happened in April 2024. The IRDAI reduced the moratorium period from eight years to five years. This is a game-changer. If you have held your health insurance policy for five continuous years, the insurer loses the right to contest your claim on grounds of non-disclosure or misrepresentation. They cannot dig up old files to say you should have known about a condition. After 60 months, your policy becomes largely incontestable. The only exception is proven intentional fraud, which is very hard for them to establish if you have been a regular premium payer. This rule applies even if you port your policy to a different insurer, as long as there is no break in coverage.

The 36-month rule for pre-existing diseases

What if you haven't completed five years? You still have a strong defense. The IRDAI recently updated the definition of a Pre-Existing Disease (PED). A condition is only considered pre-existing if it was diagnosed by a physician or if medical advice was sought within 36 months before the policy started. If a doctor discovers a condition today that was never mentioned in any record from the last three years, it is technically not a PED. You cannot disclose what does not exist in a medical record. Use the official IRDAI definition to challenge any rejection that tries to label a brand-new diagnosis as an old one.

The burden of proof lies with the insurer

A common mistake many young Indians make is feeling guilty when an insurer points a finger. You do not have to prove you were healthy; they must prove you were sick and knew it. The burden of proof lies entirely with the insurance company. They must show evidence that you intentionally concealed a material fact. If they cannot produce a hospital record, a prescription, or a test report dated before your policy started, their defense is weak. Courts in India have repeatedly ruled that insurers cannot reject claims based on mere assumptions or lifestyle guesses.

How to use your 'Paper Trail' as a defense

If you face a rejection, gather your evidence. Here is your defense toolkit:

Customer Information Sheet (CIS): Review this document immediately. It is a simplified summary of your policy that insurers must now provide. Check if they correctly noted the declarations you made during the proposal.
First Diagnosis Date: The date on your first formal medical report is your strongest evidence. If the diagnosis happened two years after you bought the policy, it proves the condition was unknown at the time of purchase.
Past Medical Checkups: If you did a company-mandated health checkup three years ago and it came back clean, use it. It proves you were proactive and had no known issues.
Family Doctor Visits: A simple letter from your regular GP stating you had no history of the disputed condition can be very persuasive.

Materiality: Does a minor issue even matter?

Insurers often nitpick. They might find a five-year-old record of a minor stomach infection and use it to reject a heart surgery claim. This is where materiality comes in. A non-disclosed fact must be material to the treatment you are seeking. If an undisclosed minor issue like a seasonal fever has no connection to your current hospitalization, the rejection is likely invalid. You can argue that the information was not material to the insurer's risk assessment. Many people think they are stuck because of a tiny mistake in the proposal form, but a tech-driven distributor like OneAssure often helps users understand that minor oversights are not grounds for total claim denial.

Don't lose your progress when porting

If you are unhappy with your current insurer and want to move, do not worry about your 'time served.' When you port your policy, your moratorium period and waiting periods for pre-existing diseases carry over. If you have already completed three years with Insurer A, you only need two more years with Insurer B to hit that five-year safety mark. Always ensure your new insurer acknowledges your previous years of coverage in the new policy document. This continuity is your best defense against future non-disclosure traps. Stay honest, keep your records in a digital locker, and remember that the law is increasingly on the side of the policyholder.