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Medicare Initial Enrollment Window Planner

Find the standard age-65 seven-month Part A/B enrollment window, including first-of-month birthdays.

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Good to know: Independent ToolsKo estimate. Sources reviewed November 11, 2026. Calendar worksheet for people first meeting the standard age-65 eligibility conditions, with 65th birthdays in 2023–2030. Eligibility must be confirmed separately with SSA/Medicare. Standard window: three months before the eligibility month through three months after it. A birthday on the first of a month shifts that eligibility month to the prior month. Does not determine eligibility, automatic enrollment, citizenship/residency conditions, employer-plan coordination, Special/General Enrollment Periods, disability/ALS/ESRD rules, Medigap/Advantage/Part D windows, penalties, premiums, coverage start dates or HSA effects. Enter your 65th birthday, not your birth date. No Medicare number is requested. Verify your individual dates with SSA before relying on them. If a window appears missed, ask SSA about special or deemed enrollment rules; this worksheet does not rule them out.

How to use it (step by step)

  1. 1Confirm with SSA/Medicare that the standard age-65 initial enrollment rules apply to you.
  2. 2Enter the date of your 65th birthday. The planner uses calendar months, not a fixed number of days.
  3. 3Review the initial window and verify it with official guidance. Do not delay enrollment based only on employer coverage or this result.

Words to know

IEP
Initial Enrollment Period: the first standard seven-month opportunity around age 65 under this worksheet’s scope.
Eligibility month
The standard age-65 month used for the calendar calculation; first-of-month birthdays shift it one month earlier.

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Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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