Insurance and billing
Coinsurance
The percentage of a covered service's cost that a patient pays after the deductible.
Coinsurance is the share of the cost, expressed as a percentage, that the patient pays for a covered service after meeting any deductible. A plan might pay a higher share of preventive services and a lower share of crowns, for instance. The patient pays the remainder, up to what the plan allows. Estimates should show both the plan's percentage and the patient's percentage so there are no surprises.
Example at the front desk
The plan pays eighty percent after the deductible, so your share is twenty percent.