During the policy period, you are allowed to make only one claim on any of the listed critical illnesses mentioned in your policy document.
As soon as you make a claim, the lump sum amount shall be paid out for the particular critical illness. The policy would be automatically terminated and subsequent renewals would be allowed in the policy of the particular insured person. If at all the policy has been issued to more than one individual then the policy shall still remain active for the other policy members.
Certain insurance policies continue other benefits except for the one which you already made the claim.
If you are making a critical illness claim then the hospitalization expenses incurred will be paid under Health Insurance. The Lump sum benefit will be paid after the survival period under Critical Illness cover. It is always better to speak to your insurance company about this clause as some insurers may allow you to make more than one claim.