Turning 65 marks a crucial financial transition as Medicare eligibility alters your health insurance rights and responsibilities. Missing key enrollment dates during this milestone can trigger permanent financial penalties and lifetime coverage gaps. Whether you plan to continue working past 65 or retire immediately, understanding how your birth month governs your choices is essential. The timing of your application dictates when your coverage begins, whether you face Part B late penalties, and how your Health Savings Account operates. By mastering the strict federal deadlines surrounding your 65th birthday, you protect both your retirement savings and your long-term medical care from costly regulatory surprises.

The Essentials
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7-Month Window: Your Initial Enrollment Period spans seven months—three months before your 65th birthday month, your birth month, and three months after.
Automatic vs. Manual: Social Security recipients enroll automatically in Parts A and B, but if you have not claimed Social Security benefits yet, you must apply manually.
2026 Cost Benchmarks: The standard Medicare Part B monthly premium is $202.90, the Part B annual deductible is $283, and the Part A inpatient deductible is $1,736 per benefit period.
The First-of-the-Month Rule: If your birthday falls on the first day of any month, federal rules move your entire timeline and enrollment window back by one full calendar month.
The HSA Retroactive Trap: Enrolling in Part A past age 65 triggers up to six months of retroactive coverage, which invalidates concurrent Health Savings Account contributions and creates tax penalties if uncorrected.

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