Pre-existing disease (PED) in health insurance: waiting period, lookback and what to disclose

What counts as a pre-existing disease?

A pre-existing disease is any condition, ailment, injury or disease that a doctor diagnosed, or for which a doctor recommended or gave medical advice or treatment, within 36 months before your policy starts. That is the definition in Schedule III of the IRDAI (Insurance Products) Regulations, 2024, which replaced the earlier 48-month window from 1 April 2024.

Two details catch people out. An old diagnosis still counts if you took medicine or saw a doctor for it in the last 36 months. And advice counts even if you didn’t follow it.

Example. Your policy starts on 1 January 2026, so the 36-month window runs back to 1 January 2023.

• Thyroid disorder diagnosed in 2019, on daily tablets ever since: pre-existing, because you received treatment inside the window.
• High blood pressure found at a health check in August 2024, medicine advised but never started: pre-existing, because advice was recommended inside the window.
• Kidney stone treated in March 2021, with no symptoms, tests or treatment since: outside the definition. Still answer any proposal-form question that asks about it.

How long is the PED waiting period?

At most 36 months of continuous coverage for conditions you declare, under clause 7 of the same schedule. Before April 2024 the ceiling was 48 months. The regulation also says insurers “may endeavor” to offer shorter waits, and some policies use 24 or 12 months.

Many wordings still put this in an exclusion coded Excl01, from IRDAI’s 2019–2020 standard wording, which was repealed in May 2024. It usually excludes the PED and its direct complications until the wait ends, and covers the PED afterwards only if it was declared when you applied and accepted by the insurer.

Example: what a declared PED does to your claims

Example. You buy a ₹10 lakh policy starting 1 January 2026 and declare type 2 diabetes. The insurer accepts it with a 36-month PED waiting period, which ends on 31 December 2028.

This assumes each bill is otherwise admissible and dengue isn’t on your specific-disease list. Room rent limits, co-payment and sub-limits still apply.

What should you disclose on the proposal form?

Disclose everything the form asks about, for every person being insured, and disclose when in doubt. Before you sign, check:

1. Diagnoses: any condition a doctor has named in the last 36 months, such as diabetes or pre-diabetes, high blood pressure, thyroid disorders, high cholesterol, asthma, or heart, kidney, liver, back or joint problems.
2. Medicines: anything you take regularly, including tablets you have taken for years for an old diagnosis.
3. Test results: abnormal reports where a doctor advised follow-up, medicine or more tests, such as a raised HbA1c, fatty liver on an ultrasound or an abnormal ECG.
4. Surgeries and hospitalisations: every admission, day-care procedure or operation within the lookback, and any surgery a doctor advised that you put off.
5. The catch-all question: wording like “any other illness, condition or treatment not mentioned above”. This is where people leave things out.
6. Habits: tobacco, smoking and alcohol, if the form asks.
7. Older history: if a question covers a longer period than 36 months, answer it as asked.
8. Porting or migrating: the new proposal form needs fresh answers. Disclose again, including anything diagnosed since your current policy started.

If an agent or website fills the form for you, read the final version and keep a copy. Claims are checked against the form, not against what you told the agent.

What happens if you don’t disclose a pre-existing disease?

Until the moratorium applies, the insurer can contest a claim, and in many wordings cancel the policy, on the ground of non-disclosure or misrepresentation. It can come to light at claim time, when hospital case papers record a history such as “known hypertensive for 5 years”.

Many current wordings also give the insurer other options, with your consent, instead of cancelling: permanently excluding the condition, adding a waiting period for it (one wording reviewed allows up to 3 years from when it was detected), or charging an extra premium.

After 60 months of continuous coverage, IRDAI’s moratorium rule says no policy or claim can be contested for non-disclosure or misrepresentation, except for established fraud. See moratorium period to work out your date.

Can an insurer reject a claim by assuming a condition was pre-existing?

It needs evidence, not an assumption. Consumer commissions have put the burden of proof on the insurer in reported cases:

• Medical Dialogues reported in June 2019 that the National Consumer Disputes Redressal Commission (NCDRC) dismissed an insurer’s revision petition, holding that a claim “cannot be denied on the mere presumption” of a pre-existing disease and that the onus of proving it lies on the insurer.
• LiveLaw reported in May 2026 that the Delhi State Consumer Commission ordered an insurer to pay a ₹20 lakh sum assured with interest, because it produced no cogent medical evidence of the diabetes and kidney disease it said had been hidden.

The insurers in both cases were life insurers, and each case turned on its facts. These rulings won’t help if your own records show a condition you didn’t declare. But if a rejection letter calls a condition pre-existing, or of “unascertained duration”, without pointing to a dated diagnosis, prescription or report, ask for the evidence. IRDAI’s 2024 Master Circular requires a rejection to give details with reference to the specific policy terms.

Can you shorten the PED waiting period?

Sometimes. The 36 months is a maximum, so some policies set less, and some wordings sell an option to cut it to 24 or 12 months, often only when the policy starts. Time already served also counts when you port or migrate, as long as you renew within the grace period (30 days, or 15 days for monthly instalments) and never break the chain.

Example. You have held a ₹5 lakh policy since 1 July 2023 with a declared PED, and port to a ₹10 lakh policy on 1 July 2026. You have served 36 months, so if the new insurer accepts you, the PED is covered up to ₹5 lakh from 1 July 2026. The extra ₹5 lakh serves its own 36 months, so the PED is covered on the full ₹10 lakh from 1 July 2029. See health insurance portability for the process.

Does the 36-month rule apply to an older policy?

Check your current wording. IRDAI’s Master Circular of 29 May 2024 told insurers to bring existing products in line with the 2024 rules by 30 September 2024, carrying forward waiting-period credit already earned, and says insurers “may extend” the new benefits to existing policyholders. The PED wait printed in the latest wording and Customer Information Sheet (CIS) your insurer sent is the one to rely on.

What to check in your policy

1. CIS item 7, “Waiting period”: the line “Pre-existing diseases: Covered after xx months”.
2. Policy wording: search the PDF for “Excl01” or “pre-existing”. Note the months, “direct complications” and the condition that the PED was “declared” and “accepted”.
3. Policy schedule: the PEDs listed against each person, and any permanent exclusion, specific exclusion or loading. “PED: None” means nothing was declared, so make sure that is true.
4. Proposal form: ask for a copy if you don’t have one. It is the record of what you disclosed.
5. Definitions section: search “Pre-existing Disease” to confirm the lookback is 36 months.
6. CIS item 13, “Your obligations”: it repeats that you must disclose all pre-existing conditions.

See how to read your policy for where these sections sit.

Where people get caught out

• Thinking “controlled” means “not pre-existing”. Diabetes or blood pressure kept normal with tablets is still a condition under treatment.
• Leaving out small things. A thyroid tablet or an old day-care procedure can be raised against a much larger claim later.
• Assuming the agent declared it. If it isn’t on the proposal form, it wasn’t declared.
• Forgetting family members. In a floater, disclose each person’s history. In many wordings each person serves their own waits.
• Expecting a higher sum insured to cover the PED straight away. The increase serves its own wait.