However, a copay may also discourage people from seeking necessary medical care. The RAND Health Insurance Experiment, a landmark study performed in the 1980s, demonstrated that cost sharing reduced appropriate and necessary office visits and preventive care as well as inappropriate visits, with adverse effects on visual acuity, blood pressure control, and survival among high-risk patients.
Medication copayments have also been associated with reduced use of necessary and appropriate medications for chronic conditions.
In a 2007 meta-analysis, RAND researchers published a review of the literature on cost sharing between 1985 and 2006. They concluded:
VETERANS HEALTH ADMINISTRATION ISSUES DIRECTIVE REGARDING COPAYMENT FOR OUTPATIENT MEDICAL CARE PROVIDED TO VETERANS BY DEPARTMENT OF VETERANS AFFAIRS
Mar 07, 2009; WASHINGTON, March 5 -- The U.S. Department of Veterans Affairs' Veterans Health Administration issued the following directive: 1....
Copayment level and compliance with antihypertensive medication: analysis and policy implications for managed care.(POLICY)
Nov 01, 2006; Objective: To measure the impact of medication Copayment level and other predictors on compliance with antihypertensive...