Every insurer has a set of underwriting guidelines which they follow to assign a ‘risk class’ to you depending on how much of a risk they face by accepting your application to be a policy holder\r\rAn insurer can choose to add a waiting period to your policy before which the policy does not come into effect, or\rAgree to a life time exclusion wherein they protect you against complications other than the ones caused by your pre-existing condition, or\rAsk you to pay a higher premium, or\rDeny your application for insurance cover\rRemember