For a single parent with children under 18, health insurance costs range from $168 to $933 a month for hospital-only cover, $17 to $467 a month for extras-only cover, and $255 to $1,386 a month for combined cover. These premiums are before applying any discounts, rebates or loadings. The price of your policy will be influenced by various factors, including your level of cover, where you live and whether you’re eligible for any rebates.