👉 Coinsurance is a policy provision in health insurance that specifies how much a policyholder will pay for their medical expenses, based on their income and other factors. The amount of coinsurance depends on the level of coverage offered by the insurer. In some cases, the coinsurance is a percentage of the cost of the treatment; in others, it may be a fixed amount paid out at certain points during the course of care. It's important to understand that while coinsurance can help lower the overall financial