What is cost sharing?
cost sharing is Payment method whereby a person is required to pay some health costs in order to receive medical care. The general set of financing arrangements whereby the consumer must pay out-of-pocket to receive care, either at the time of initiating care or during the provision of health care services, or both. Cost sharing can also occur when an insured person pays a portion of the monthly premium for health care insurance.
source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.