"As of October 2021, the total Medicare enrollment is 63,964,675. Original Medicare enrollment is 36,045,321, and Medicare Advantage and Other Health Plan enrollment is 27,919,354. This includes enrollment in Medicare Advantage plans with and without prescription drug coverage. Medicare Part D enrollment is 49,141,158, which includes enrollment in stand-alone prescription drug plans as well as Medicare Advantage plans that offer prescription drug coverage."
This enrollment information is updated monthly and can be viewed here https://data.cms.gov
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