Medicare Enrollment Periods Explained
Understand Medicare’s Initial, General, Special, Open Enrollment and Medicare Advantage Open Enrollment periods and why timing matters.
Medicare uses several enrollment periods, and they do not all allow the same changes. Missing an applicable deadline can cause delayed coverage or penalties, so verify the rules for your situation before acting.
Initial Enrollment Period
For most people who become eligible at 65, the Initial Enrollment Period is a seven-month window. It begins three months before the month you turn 65, includes your birthday month, and ends three months afterward. Coverage start dates depend on when enrollment occurs.
Some people receive Part A and Part B automatically, while others must enroll. Employment, employer size, disability eligibility, Health Savings Account contributions, and current coverage can affect the timing decision.
Special Enrollment Periods
Certain events can create a Special Enrollment Period. Examples may include losing qualifying employer coverage, moving outside a plan’s service area, or changes involving Medicaid or Extra Help. The length and permitted actions depend on the event.
General Enrollment Period
The General Enrollment Period for Part A and Part B runs January 1 through March 31 for people who did not enroll when first eligible and do not qualify for a Special Enrollment Period. Late-enrollment penalties may apply.
Medicare Open Enrollment
From October 15 through December 7, people can generally change Medicare Advantage or prescription-drug coverage for the following year.
Medicare Advantage Open Enrollment
From January 1 through March 31, people already enrolled in Medicare Advantage can generally make one change to another Medicare Advantage plan or return to Original Medicare.
Before a deadline, confirm provider participation, review prescriptions, compare total costs, read the Annual Notice of Change, and understand the effective date before ending other coverage.
Disclosure: Not connected with or endorsed by the U.S. government or the federal Medicare program. Enrollment rights depend on individual facts and current rules. Verify through Medicare.gov, 1-800-MEDICARE, Social Security, the plan, or a licensed professional.
Sources: Medicare.gov sign-up guidance and plan enrollment periods.
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