That thick Medicare & You 2027 handbook arriving in your mailbox may look like another piece of government mail destined for the recycling bin. Don’t toss it yet, because the annual handbook arrives at exactly the time Medicare beneficiaries should be reviewing what could change about their health coverage next year. Medicare describes the handbook as its official guide to benefits, costs, rights, protections, and health and drug plans, and updated copies are mailed to Medicare households in late September. Open Enrollment runs from October 15 through December 7, 2026, so the decisions you make after reading it can affect your health care costs throughout 2027. Before putting the book in a drawer (or recycling it), check these seven things.