Yes, the insured person has to pay for the co-payments while buying this optional cover.
Cover Copayment
Pre-existing Diabetes 10% of the claim amount admitted by the insurer for diabetes alone.
Pre-existing Hypertension 10% of the claim amount admitted by the insurer for Hypertension alone.
Pre-existing Diabetes and Hypertension 25% of the claim amount admitted by the insurer for both Diabetes and Hypertension