Beginning in 2021, Medicare Advantage plans were allowed to waive Part D copay amounts for low-income members through the VBID model. This offering rapidly expanded, with 62 participating Medicare Advantage Organizations offering the benefit on their D-SNPs in the 2025 coverage year. This paper examines the impact of removing Part D copays on medication adherence among members, focusing on subsets of the population categorized by socioeconomic statuses and demographics.
