Yes, you can avail of the NCB facility if you change the insurer on renewal. You would have to produce proof of the NCB earned by way of renewal notice from the current insurer. If the same cannot be produced, you may produce your original expiring policy along with a certification that no claim has been lodged by yourself on the expiring policy. Hence, evidence can be in form of a renewal notice or a letter confirming the NCB entitlement from the previous insurer.