Start by finding out whether you will receive Medicare automatically or need to apply. Social Security handles most Part A and Part B applications; the Railroad Retirement Board handles enrollment for people covered through its program. Choosing a private Medicare plan is a separate step.
1. Check whether enrollment is automatic
If you receive Social Security or Railroad Retirement Board benefits at least four months before turning 65, you generally receive Parts A and B automatically. Part B is not automatic for residents of Puerto Rico or people outside the United States. Read your enrollment notice and verify the effective dates rather than assuming you are covered.
If you are not receiving those benefits, you generally need to apply. People who qualify before 65 because of disability, ALS or End-Stage Renal Disease have different rules; confirm your specific route with Social Security or the Railroad Retirement Board.
2. Identify your enrollment period
| Situation | Timing to check |
|---|---|
| Approaching age 65 | The Initial Enrollment Period generally begins three months before your birthday month, includes that month, and ends three months afterward. |
| Birthday is the first of the month | Your Medicare timing shifts a month earlier; confirm the start and end dates. |
| Qualifying group coverage from current employment | You may have a Part B Special Enrollment Period while covered and for eight months after employment or coverage ends, whichever happens first. |
| No applicable initial or special period | The General Enrollment Period for Part B and premium Part A is January 1–March 31; coverage generally starts the following month and a penalty may apply. |
COBRA and retiree insurance do not extend the current-employment Part B deadline. Having a job alone is not enough: confirm the group coverage and which insurer pays first before delaying Medicare. If you contribute to a Health Savings Account, ask about retroactive premium-free Part A before applying.
3. Apply through the correct agency
Use Social Security’s official Medicare application process or contact the Railroad Retirement Board if applicable. If you already have Part A and need Part B, use the Part B enrollment process and provide any requested proof of current-employment group coverage. Keep your submission confirmation and follow up on missing information.
Check the Medicare number and coverage dates on the resulting notice or card. Do not send Social Security numbers or identity documents through an ordinary blog comment or general insurance contact form.
4. Choose how you will receive coverage
After Parts A and B are established, compare Original Medicare with Medicare Advantage. A Medicare Advantage plan requires both parts and availability in your service area. A separate Part D plan requires Part A or Part B. Each private-plan election must use an allowed enrollment period.
If you choose Original Medicare, review whether you want Medigap. Its federal six-month enrollment protection for people 65 or older with Part B is separate from the fall plan-enrollment season. Do not assume every kind of coverage can be added at any time.
5. Get help suited to the question
- Federal enrollment or eligibility: Social Security or the Railroad Retirement Board.
- Independent local insurance counseling: your State Health Insurance Assistance Program, known as SHIP. Its counseling is free and it is not connected to an insurer.
- Private plans we represent: a Licensed Insurance Agent can explain plan documents, costs, networks and enrollment options.
- A current claim or benefit: Medicare or your current plan’s member-services team.
Bring your coverage dates, existing insurance information and questions. Confirm the new effective date and approval before canceling other coverage.
Related coverage questions
- Who Is Eligible for Medicare? Age, Disability and Enrollment
- How to Verify Your Medicare Coverage and Plan Enrollment
- When Does Medicare Start? Effective Dates for Parts A and B