Medicare has a reputation for being confusing, but the timeline itself is simple once someone lays it out. Here is the checklist we walk North Mississippi clients through, organized by when each step needs to happen.
Know your window: the 7-month rule
Your Initial Enrollment Period runs 7 months: the 3 months before your birthday month, your birthday month, and the 3 months after. Enroll in the 3 months before your birthday and coverage starts the first day of your birthday month, which is the smoothest path. Wait until later in the window and your start date slips.
6 months out: get your bearings
- Confirm you have a my Social Security account at ssa.gov; you will use it to enroll.
- Learn the four parts: A (hospital), B (medical), C (Medicare Advantage), D (prescription drugs).
- Start a list of your doctors, your pharmacy, and every prescription with dosage. This list drives every good decision later.
- If you are still working, find out whether your employer has 20 or more employees; it changes your whole timeline (see below).
3 months out: enroll in A and B
- Apply online at ssa.gov, by phone, or at a Social Security office. If you already receive Social Security benefits, enrollment in A and B is automatic and your card arrives in the mail.
- Most people pay nothing for Part A. Part B costs $202.90 per month for most enrollees in 2026, deducted from Social Security if you receive it.
- Higher incomes pay more for Part B via IRMAA, based on your tax return from two years prior.
Same window: make the real decision
Parts A and B alone leave real gaps: deductibles, 20% coinsurance with no cap, and no drug coverage. During this same window, choose your path: Original Medicare plus a Medicare Supplement and a standalone Part D drug plan, or a Medicare Advantage plan that bundles it together. Your 6-month Medigap open enrollment, the only time you can buy any Supplement with no health questions, starts when your Part B takes effect. Do not let it pass unexamined.
The penalties are permanent
Skip Part B without creditable employer coverage and your premium goes up 10% for each 12-month period you delayed, for life. Skip drug coverage and Part D adds a penalty of 1% of the national base premium per month you went without, also permanent. The fix is simple: enroll on time, or make sure your employer coverage counts as creditable.
Still working at 65? Read this first
If you (or your spouse) are actively working and covered by an employer plan from a company with 20 or more employees, you can usually delay Part B and drug coverage without penalty, and enroll later through a Special Enrollment Period when the job or coverage ends. Many people in this situation still take free Part A. If the employer has fewer than 20 employees, Medicare generally needs to become your primary coverage at 65, so do not delay. When in doubt, confirm with HR whether your coverage is creditable, and get it in writing.
After you enroll: two habits
- Watch the mail for your card and set up your Medicare.gov account.
- Review your plan every fall during Annual Enrollment (October 15 to December 7). Networks, drug lists, and premiums change every year even when your health doesn’t. A 20-minute annual review is the cheapest insurance there is.
You do not have to do this alone
Every step above, from the enrollment paperwork to comparing every plan available in your Mississippi county, is something a licensed local advisor can do with you at no cost. We help people across Pontotoc, Tupelo, Oxford, and all of North Mississippi through this exact checklist every week.