Turning 65? Medicare Enrollment Deadlines & Late Penalties (2026)
Turning 65 is an important Medicare milestone. For many people, it is the first time they must decide whether to enroll in Medicare Part A, Part B, prescription drug coverage, or a Medicare Advantage plan. Medicare enrollment is not automatic for everyone. Some people are enrolled automatically because they already receive Social Security or Railroad Retirement benefits, while others must actively apply. Missing the correct enrollment period can lead to coverage gaps and, in some cases, ongoing late-enrollment penalties. For a broader explanation of Medicare and Medicaid eligibility, read Medicare vs. Medicaid in 2026: Eligibility, Costs, and Asset Rules Explained . The Main Rule Your first Medicare enrollment opportunity is usually a 7-month Initial Enrollment Period centered on the month you turn 65. Do not assume that COBRA, retiree coverage, Marketplace insurance, or another private plan automatically allows you to delay Med...