If you opt for a policy that requires full medical underwriting then all your medical history will be available to your insurers up front enabling them to make an informed judgement before confirming your policy. A moratorium policy is however a little bit different as this type of application process does not require disclosure of medical history when joining. Instead any illness is assessed at the point of making a claim. However, if you do not have any symptoms, treatment, medication, or advice for those pre-existing conditions, and any directly related conditions, for two continuous years after your policy starts, then insurers may reinstate cover for those conditions.
With moratorium you do not need to fill in a health questionnaire. Instead, pre-existing conditions for which you (and any dependant included in your application) have received treatment and/or medication, or asked advice on, or had symptoms of (whether or not diagnosed), during the five years immediately before your private health insurance cover started will automatically be excluded from cover. However, if you do not have any symptoms, treatment, medication, or advice for those pre-existing conditions, and any directly related conditions, for two continuous years after your policy starts, then insurers may reinstate cover for those conditions.