Coinsurance is your share of the costs of a health care service. It’s usually figured as a percentage of the amount we allow to be charged for services. You start paying co-insurance after you’ve paid your plan’s deductible.

For example, you’ve paid $1,500 in health care expenses and met your deductible. When you go to the doctor, instead of paying all costs, you and your plan share the cost. For example, your plan pays 70 percent. The 30 percent you pay is your coinsurance.

Generally speaking, plans with low monthly premiums have higher coinsurance, and plans with higher monthly premiums have lower coinsurance.