Medicare Enrollment Checklist: Documents and Steps You Need
Starting Medicare is easier when you know which enrollment period applies, when your current insurance ends, and what information Social Security may need.
How to Apply for Medicare: Step-by-Step Guide for 2026
Last Modified: 10/05/2026 | Reviewed by Keith Armbrecht (NPN 634015)
Quick Summary
Most people who need to actively enroll in Medicare Part A and Part B apply through the Social Security Administration.
You can generally apply online through Social Security, contact Social Security directly, or work through the Railroad Retirement Board if you or your spouse worked for a railroad.
Some people are automatically enrolled, so the first step is determining whether you actually need to submit an application.
Key Facts
- Social Security handles Medicare Part A and Part B enrollment.
- The online Social Security application is generally the fastest way to apply.
- You don’t have to begin collecting Social Security retirement benefits to enroll in Medicare.
- Some people are automatically enrolled.
- Your Medicare enrollment period determines when you can apply.
- Applying late can potentially cause penalties and coverage gaps.
- People retiring after 65 may need proof of employer coverage.
- Medicare Advantage, Part D and Medigap enrollment occur separately after or alongside obtaining Parts A and B.
- Medicare generally mails your Medicare card after enrollment is processed.
Step 1: Determine Whether You Need to Apply
If you’re already receiving Social Security benefits before age 65, you may be automatically enrolled.
If you’re not receiving Social Security, you’ll generally need to take action yourself.
Step 2: Determine Your Enrollment Period
Most people turning 65 use their Initial Enrollment Period.
That seven-month window begins:
3 months before your 65th birthday month
and ends:
3 months after your birthday month.
People who delayed Medicare because of qualifying active employer coverage may instead use a Special Enrollment Period.
Step 3: Apply Through Social Security
The most convenient method for most people is applying online through the Social Security Administration.
You can apply for:
Medicare Part A
and
Medicare Part B
without applying for Social Security retirement benefits.
Step 4: Receive Your Medicare Number and Card
After your enrollment is processed, you’ll receive your Medicare information and card.
Your Medicare number is then used when enrolling in additional Medicare coverage.
Step 5: Decide How You Want Your Medicare Coverage
Once you have Part A and Part B, you’ll generally choose between two main paths:
Original Medicare + potentially Medigap + Part D
or
Medicare Advantage
Video Explanation from Keith
How to Apply for Medicare Step by Step
Keith's Take
Applying for Medicare itself isn’t usually the hardest part.
The mistakes tend to happen before and after the application.
Before you apply, make sure you actually need Medicare now—especially if you’re still working.
After you apply, don’t stop with Part A and Part B. Decide whether you’re going with Original Medicare and additional coverage or Medicare Advantage.
The timing of all these pieces needs to work together.
Keith Armbrecht
Medicare on Video
Frequently Asked Questions About Applying for Medicare
Q. Where do I apply for Medicare?
A. For most people, through the Social Security Administration.
Q. Can I apply online?
A. Yes. Social Security provides an online Medicare application.
Q. Do I need to start Social Security to get Medicare?
A. No.
Q. How early should I apply?
A. If you need coverage at 65, begin the process during the three months before your birthday month.
Q. What if I worked past 65?
A. You may qualify for a Special Enrollment Period.
Q. What forms do I need after employer coverage ends?
A. People enrolling in Part B after active employer coverage may need documentation showing they had qualifying job-based health coverage.
Q. People enrolling in Part B after active employer coverage may need documentation showing they had qualifying job-based health coverage.
A. Medicare states that after you sign up, a welcome package with your Medicare card is generally mailed after enrollment is processed.
Q. Do I choose Plan G or Medicare Advantage on the Social Security application?
A. No. Social Security handles Part A and Part B. Private Medicare coverage choices are separate.
Official Government Sources
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