From Medicare.gov

An amount you may be required to pay as your share of the cost for services after you pay any deductibles. Coinsurance is usually a percentage (for example, 20%).

RaphaelFrom Medicare.gov An amount you may be required to pay as your share of the cost for services after you pay any deductibles. Coinsurance is usually a percentage (for example, 20%).Making Senior Health Simple« Back to Glossary Index