Highest claim rejection rate means that it is the worst company and the flag in this case is held by Edelweiss Tokio followed by Aegon Religare, Shriram Life, India First and Future Generali. The one thing which will be glaring is that new companies have high claim rejection rate in initial years and thus it is better to avoid new companies while going for insurance to be on the safer side. However before jumping the gun; please do see the overall result for best insurance company in India based on a number of parameters.