Cost-related medication nonadherence among Medicare beneficiaries with cardiovascular disease risk factors: The role of comprehension of the Medicare programme and its prescription drug benefits.

Perceived difficulty of understanding the Medicare Programme and its prescription drug benefits is associated with CRN among Medicare beneficiaries with CVD risk factors, especially those with obesity, hypertension or hyperlipidemia. Monitoring and enhancing Medicare beneficiaries' overall understanding of the Medicare programme may reduce CRN.