Most people have only one chance to enroll in Medicare without penalty: the Initial Enrollment Period (IEP), a 7-month window centered on your 65th birthday. Miss it without qualifying coverage from an employer, and you could face permanent premium surcharges that follow you for the rest of your life. This checklist is designed to help you prepare well in advance so that nothing falls through the cracks.
Start 6 Months Before Your Birthday
Ideally, begin this checklist 6 months before you turn 65. Some steps - like deciding whether to keep employer coverage or researching Medigap plans - take time and should not be rushed.
Step 1: Confirm Your Medicare Eligibility
Before anything else, confirm that you are eligible for Medicare and understand what you will pay. Most people qualify for premium-free Part A at age 65 if they or their spouse worked and paid Medicare taxes for at least 10 years (40 quarters). Part B requires a monthly premium - $202.90 in 2026 for most beneficiaries.
Verify your work history by checking your Social Security statement at ssa.gov
If you do not have 40 work credits, check whether you qualify through a spouse's work record
Confirm your birthday month - your IEP opens 3 months before the month you turn 65
If you are already receiving Social Security benefits, you will be enrolled in Parts A and B automatically
Step 2: Decide Whether to Keep Employer Coverage
If you or your spouse are still working and covered under an active employer group health plan, you may be able to delay Part B enrollment without penalty. This is one of the most consequential decisions you will make, and the rules are specific.
| Question | If Yes | If No |
|---|---|---|
Is your employer group plan from a company with 20+ employees? | You can delay Part B without penalty while actively employed | Medicare is primary - enroll in Part B now to avoid gaps |
Are you covered under a spouse's active employer plan? | You can delay Part B without penalty | Enroll in Part B during your IEP |
Do you have COBRA or retiree coverage? | COBRA/retiree plans do NOT protect you from Part B penalties | Enroll in Part B - these plans are not creditable for SEP purposes |
COBRA Is Not a Substitute for Part B
Many people mistakenly delay Part B enrollment because they have COBRA. COBRA is not considered active employer coverage for Medicare purposes. If you delay Part B because of COBRA, you will not qualify for a Special Enrollment Period when COBRA ends and may face a permanent 10% penalty per year of delay.
Step 3: Gather Your Documents
Whether you apply online, by phone, or in person at a Social Security office, you will need certain documents on hand. Gathering these in advance makes the application process much smoother.
Proof of U.S. citizenship or lawful permanent residency (passport, birth certificate, or naturalization certificate)
Social Security card or number
Proof of age (birth certificate or passport)
If delaying Part B due to employer coverage: a letter from your employer confirming active group health coverage and the date coverage began
If applying for Part A only: documentation showing you are still working and have employer coverage
Bank account information if you want Medicare premiums auto-deducted (Medicare Easy Pay)
Step 4: Apply for Medicare
There are three ways to apply for Medicare. The online application through Social Security is the fastest and most convenient option for most people.
Online: Visit ssa.gov/medicare - takes about 10 minutes and you receive confirmation immediately
By phone: Call Social Security at 1-800-772-1213 (TTY: 1-800-325-0778), Monday through Friday, 8 a.m. to 7 p.m.
In person: Visit your local Social Security office - find yours at ssa.gov/locator
Your Initial Enrollment Period is 7 months long: it begins 3 months before the month you turn 65, includes your birthday month, and ends 3 months after. Enrolling in the first 3 months ensures your coverage starts on the first day of your birthday month. Enrolling in your birthday month or after may delay your coverage start date.
Step 5: Choose Your Coverage Path
Once you have Original Medicare (Parts A and B), you have two main paths for additional coverage. This is the most important plan decision you will make, and the right choice depends on your health, budget, and lifestyle.
| Coverage Path | How It Works | Best For |
|---|---|---|
Original Medicare + Medicare Supplement (Medigap) + Part D | Medigap pays costs Original Medicare leaves behind; Part D covers prescriptions | People who want predictable costs, freedom to see any doctor nationwide, and minimal out-of-pocket exposure |
Private plan replaces Original Medicare; often includes drug coverage and extra benefits like dental and vision | People who want lower monthly premiums and are comfortable with network restrictions and copayments |
Medigap Enrollment Has a Protected Window
Your Medigap Open Enrollment Period begins the month you are both 65 and enrolled in Part B. During this 6-month window, insurers cannot deny you coverage or charge you more due to pre-existing conditions. After this window closes, you may be subject to medical underwriting.
Step 6: Enroll in a Part D Drug Plan (If Needed)
If you choose Original Medicare with a Medigap plan, you will need a separate Part D prescription drug plan. If you choose Medicare Advantage, most plans already include drug coverage (called MA-PD plans). Either way, you should enroll in drug coverage during your Initial Enrollment Period to avoid the Part D late enrollment penalty.
Use the Medicare Plan Finder at Medicare.gov to compare Part D plans in your area
Enter your specific medications to see which plans cover them and at what cost
Compare monthly premiums, annual deductibles (up to $615 in 2026), and copayments for your drugs
Check the plan's formulary tier for each of your medications
Note the plan's pharmacy network - using preferred pharmacies can significantly reduce costs
Step 7: Review Financial Assistance Programs
If you have limited income and resources, you may qualify for programs that reduce your Medicare costs significantly. These programs are often underutilized because many people do not know they exist.
| Program | What It Covers | Who Qualifies |
|---|---|---|
Reduces Part D premiums, deductibles, and copayments | Individuals with income up to ~150% of the federal poverty level | |
Medicare Savings Programs (MSPs) | Pays Part B premiums and may cover Part A costs and cost-sharing | Individuals with limited income and resources - four levels of assistance available |
Pays Part A and Part B premiums, deductibles, and coinsurance | Lowest-income Medicare beneficiaries | |
State Pharmaceutical Assistance Programs (SPAPs) | Additional drug cost assistance beyond Extra Help | Varies by state - contact your State Health Insurance Assistance Program (SHIP) |
Step 8: Set Up Premium Payments
Medicare Part B premiums are typically deducted automatically from your Social Security benefit if you are already receiving it. If you are not yet collecting Social Security, Medicare will bill you quarterly by mail. You can set up automatic bank withdrawals through the Medicare Easy Pay program to avoid missed payments.
Enroll in Medicare Easy Pay at Medicare.gov or by mailing Form CMS-10223
Keep your mailing address current with Social Security to ensure you receive bills and Medicare communications
If your income is above the IRMAA thresholds ($106,000 individual / $212,000 joint in 2024), expect a higher Part B premium
Medicare Enrollment Checklist Summary
| Timing | Action Item | Status |
|---|---|---|
6 months before 65 | Check your Social Security work record and confirm eligibility | ☐ |
6 months before 65 | Decide whether to keep employer coverage or enroll in Part B | ☐ |
6 months before 65 | Research Medigap plans while you still have guaranteed issue rights | ☐ |
3 months before 65 | Apply for Medicare online, by phone, or in person | ☐ |
3 months before 65 | Gather required documents (ID, Social Security card, employer letter if applicable) | ☐ |
At 65 (with Part B) | Enroll in a Medigap plan during your 6-month Open Enrollment Period | ☐ |
At 65 | Compare and enroll in a Part D drug plan using Medicare Plan Finder | ☐ |
At 65 | Apply for Extra Help or Medicare Savings Programs if eligible | ☐ |
After enrolling | Set up premium auto-pay through Medicare Easy Pay | ☐ |
After enrolling | Schedule your Welcome to Medicare preventive visit | ☐ |
Frequently Asked Questions
Need Help Understanding Your Medicare Options?
Our licensed Medicare experts can help you find the right coverage for your needs.