Abstract
Medicare Advantage (MA) plans have increasing flexibility to provide nonmedical services to support older adults aging in place in the community. However, prior research has suggested that enrollees with functional disability (hereafter, "disability") were more likely than those without disability to leave MA plans. This indicates that MA plans might not meet the needs of older adults with disability. We used data for 2011-16 from the National Health and Aging Trends Study linked to Medicare claims to measure and characterize switches in either direction between Medicare Advantage and traditional Medicare in the twelve months before and after onset of disability. While the rate of switches from Medicare Advantage to traditional Medicare increased slightly after disability onset, people with greater levels of disability were more likely to switch to traditional Medicare, compared to those with lower levels: 36 percent of those who switched from Medicare Advantage to traditional Medicare needed help with two or more activities of daily living, compared to 14.3 percent of those who switched from traditional Medicare to Medicare Advantage. This indicates the potential benefit of including functional measures in MA plan risk adjustment and quality measures. Furthermore, the highest-need older adults with disability may experience lower-quality care in Medicare Advantage and thus leave before accessing the program's expanded benefits.