What does "coinsurance after deductible" mean?

Coinsurance after deductible refers to the amount of the bill a consumer is responsible for once the insurance deductible has been met. For example, in a 70/30 coinsurance after deductible plan, the consumer pays 30 percent of the cost of medical services and the insurance company pays 70 percent.

Coinsurance is a separate fee to a copay that is required at the time when services are rendered. It is possible for a consumer to have to pay both a copay and coinsurance for the same medical service. An example of this would be an emergency room visit or a doctor's appointment where a copay was required, but a bill for additional services is also required.