A No Claim Bonus (NCB) in health insurance is a reward for policyholders who do not file any claims during a policy year. It typically comes as a discount on the premium for the next renewal or an increase in the sum insured without extra cost. For instance, a policyholder may receive a bonus of up to 50% of their premium or an enhanced coverage amount. The specifics can vary by insurer, so it's essential to check the policy details. The NCB encourages healthy habits and can lead to significant savings over time.