The top up health insurance plan offers coverage for hospitalization expenses. Benefits of buying top up health insurance – accident cover, hospital cash, critical illness, day care treatment, ambulance charges, etc. You can purchase top up health insurance with bank policy, corporate policy or basic policy. Basically, top-up health insurance is like an add on policy it adds additions sum insured. The only difference is the cost of deductibles that make these plans easy-on pocket. Means, the plans work once your deductible amount (i.e. old policy Sum Insured) is exhausted.