The Medicare annual wellness visit-a preventive care visit free to Medicare beneficiaries enrolled in Part B-requires detection of cognitive impairment. We surveyed an internet panel of adults ages sixty-five and older who were enrolled in fee-for-service Medicare or Medicare Advantage to measure the use of that benefit and the receipt of structured cognitive assessment by 2019. Overall, approximately one-half of beneficiaries surveyed reported having an annual wellness visit, and fewer than one-third reported having a structured cognitive assessment. Compared with fee-for-service enrollees, Medicare Advantage enrollees were nearly 20percentage points more likely to report that they had an annual wellness visit and 8.6percentage points more likely to report that it included a structured cognitive assessment. The difference suggests that the rate of structured cognitive assessment in fee-for-service Medicare might be increased by offering financial and other incentives for take-up that are similar to those in Medicare Advantage.