This document provides explanations of key health insurance terms - co-payment, deductible, coverage amount, and premium. It defines co-payment as a clause where the policyholder shares a portion of each claim amount with the insurer. Deductibles apply to top-up plans and refer to an amount of claims the policyholder must pay before the plan covers further expenses. Coverage amount is the maximum the insurer will pay for claims in a year. Premium is the annual amount the policyholder pays the insurer for the coverage. The document explains how coverage amount determines premium costs and advises choosing optimal levels of both.