Pre-Existing Disease Coverage in Group Plans (Day 1 Cover)
What a pre-existing disease is, the 36-month cap on its waiting period and the 60-month moratorium, why some group policies cover pre-existing diseases from the day of enrolment, and what that day-1 cover does and does not change.
Pre-existing diseases and the waiting period
A pre-existing disease (PED) is a condition a person already had before the cover began; the policy wording defines which past conditions count. A health policy may apply a waiting period before claims for such a condition become payable. The waiting period exists because a person who already knows of a condition is more likely to claim soon after cover begins, at the cost of everyone else in the pool.
Regulation limits how long that wait can be. Since 1 April 2024 a health policy may not apply a PED waiting period of more than 36 months; older material quotes 48. Within the cap, the waiting period is a product term: each policy sets its own.
The moratorium
A second limit works over a longer time. After 60 continuous months of cover, called the moratorium, a policy cannot be contested for non-disclosure or misrepresentation except for established fraud. Time under a ported or migrated policy counts towards the 60 months. Older material quotes 96 months, or eight years, which was the earlier rule.
Day-1 cover in group policies
Some group policies waive the PED waiting period altogether, so that pre-existing diseases are covered from the date a member is enrolled. This is often called day-1 PED cover. It comes about by negotiation between the employer and the insurer.
An insurer may agree to this because of how an employer group is formed. People join because of their job, not because they expect a claim, and the insurer assesses and prices the group as a whole. That pooling limits adverse selection, the tendency for those most likely to claim to be the keenest to buy cover.
Day-1 cover is a priced feature of the master policy, not a legal entitlement. It applies only where the group's own policy says so. Individual policies cover pre-existing diseases too, but after a waiting period of at most 36 months.
What day-1 cover does not change
Day-1 cover removes one obstacle: the PED waiting period. A claim for a pre-existing condition is then not excluded on that ground, but it is still assessed against the policy's other terms, such as the sum insured, sub-limits and any co-pay.
Terms vary from one group policy to the next, so the master policy decides what is waived and what is not.
Rules at a glance
A known heart condition and surgery two months after joining
Illustration: Ramesh has a known heart condition when he joins a firm whose group policy provides day-1 PED cover. Two months after he is enrolled, he needs bypass surgery. No PED waiting period applies to the claim, so the surgery is not excluded on the ground that the condition was pre-existing. The claim is then assessed like any other, against the sum insured, the sub-limits and any co-pay in the policy.
The same claim with and without day-1 cover
- Assumptions of the example: a member with a pre-existing heart condition has surgery in the second month after enrolment. The admissible claim is ₹4,00,000, within a sum insured of ₹5,00,000. Policy A has day-1 PED cover and a 10% co-pay. Policy B has a 24-month PED waiting period, which is within the 36-month cap. All figures are made up for the example.
- Policy A: no PED waiting period applies. Co-pay = 10% of ₹4,00,000 = ₹40,000. The insurer pays ₹4,00,000 − ₹40,000 = ₹3,60,000.
- Policy B: month 2 is earlier than month 24, so the claim falls in the PED waiting period and is not payable under the policy.
- Policy B, later: once 24 months of continuous cover are complete, a claim for the same condition would no longer be excluded by the waiting period.
Result. Policy A pays ₹3,60,000 and the member bears ₹40,000; Policy B pays nothing for this claim because the waiting period has not been served.
Key points
- A pre-existing disease is a condition a person already had before the cover began.
- Since 1 April 2024 the PED waiting period in a health policy cannot exceed 36 months; older material quotes 48.
- After 60 continuous months of cover, the moratorium, a policy cannot be contested for non-disclosure or misrepresentation except for established fraud.
- Day-1 PED cover means pre-existing diseases are covered from the date of enrolment, with no waiting period.
- It is a negotiated, priced feature of the master policy, not a legal entitlement.
- A claim under day-1 cover is still subject to the sum insured, sub-limits and any co-pay.
Common misunderstandings
- Thirty-six months is a ceiling, not the waiting period every policy has: a policy may set a shorter one, and some group policies waive it.
- Day-1 PED cover is not a right under the law: it exists only where the employer and the insurer have agreed it in the master policy.
- Day-1 cover does not mean the whole bill is paid: the sum insured, sub-limits and any co-pay still apply.
- The moratorium is not a waiting period: it limits the insurer's right to contest a policy for non-disclosure or misrepresentation, and it does not protect a case of established fraud.
Questions people ask
Do individual health policies never cover pre-existing diseases?
They do cover them, after a waiting period of at most 36 months. The difference in a group policy with day-1 cover is that the waiting period is waived.
Why would an insurer waive the waiting period for a large employer group?
Because risk is pooled across the whole group. Members join because of their job, not because they expect a claim, which limits adverse selection.
What this lesson relies on
- IRDAI (Insurance Products) Regulations, 2024 (in force 1 April 2024)
- IRDAI Master Circular on Health Insurance Business (29 May 2024) — waiting periods and moratorium
- The master policy wording of the group product concerned (pre-existing disease terms)
This lesson was reviewed independently against these sources on 8 October 2026. Rules change: check the current regulation, scheme document or policy wording before relying on any figure. This is education, not advice.