Can critical illness claim under health insurance can be denied based on 3 financial years with occupation proof of the insured not available?
I have not seen any claim getting rejected due to this reason. Infact income proof has nothing to do with claim, but I would not like to make comment without knowing more about the case.
I run a claim advisory platform, we can check what's wrong in your claim and hopefully if everything is in order, you should be able to get your claim.
I suggest you drop in an email to me on email@example.com with the policy copy and rejection letter.