Will my No Claim Bonus get migrated if I want to change my insurance company?

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. Alternately, you can produce your original, expiring policy along with a certification that you have lodged no claims on the expiring policy. For this the proof can be in the form of a renewal notice or a letter confirming the NCB entitlement from the previous insurer.