Reviewed September 16, 2026. Use this checklist to prepare for Medicare from six months before your 65th birthday through the first month of coverage. Enrollment timing depends on whether you receive Social Security benefits, keep active-employment coverage, contribute to a Health Savings Account, or retire.
Start with your exact situation. Medicare provides an official questionnaire that tells you when and how to enroll. Check your enrollment path on Medicare.gov.
Your seven-month Initial Enrollment Period
For most people who become eligible at 65, the Initial Enrollment Period lasts seven months: the three months before the birthday month, the birthday month, and the following three months. If your birthday is on the first day of a month, Medicare calculates the period differently and coverage can begin the previous month. Confirm your dates on Medicare.gov.
| When | Actions to take |
|---|---|
| 6 months before 65 | Identify your current coverage, expected retirement date, employer size, HSA contributions, doctors, prescriptions, pharmacies and preferred hospitals. |
| 4–5 months before | Ask the employer benefits office how the group plan coordinates with Medicare and whether the coverage is based on current employment. |
| 3 months before | Your Initial Enrollment Period generally begins. Confirm whether enrollment will be automatic or whether you must apply through Social Security. |
| 2 months before | Compare Original Medicare with Medicare Advantage; review Part D and Medigap timing if relevant. |
| 1 month before | Verify the effective dates shown in your official records and provide required Medicare details to any plan you join. |
| Birthday month | If you have not enrolled, check the resulting start date before ending other coverage. |
| 1–3 months after | Your Initial Enrollment Period continues, but a later application can delay coverage. Check the official start-date table. |
| First month covered | Confirm your Medicare card, plan membership materials, drug formulary, pharmacy, provider network when applicable, and premium payment method. |
Six months before: gather facts before choosing
- Write down every prescription, dose and frequency.
- List your doctors, specialists, hospitals and preferred pharmacies.
- Record the date current employer coverage is expected to end.
- Ask whether coverage is tied to your or your spouse’s current employment.
- Ask how many employees the employer has and which coverage pays first after age 65.
- Check whether you or an employer is contributing to an HSA.
- Estimate yearly costs using premiums, deductibles, copayments, coinsurance and maximum out-of-pocket limits.
Do not cancel existing coverage until you have confirmed the effective date of the replacement coverage in an official notice or plan document.
Four to five months before: talk to the employer plan
Rules can differ depending on the type of employer coverage and employer size. Medicare warns that coverage from COBRA or a retiree plan is not treated the same as coverage based on current employment for the Part B Special Enrollment Period. Ask the employer benefits administrator how the plan works with Medicare before delaying Part B. Read Medicare’s working-past-65 guidance.
Three months before: determine whether you must enroll
Some people receive Part A and Part B automatically, while others must apply. Medicare says this depends in part on whether Social Security or Railroad Retirement Board benefits began before Medicare eligibility. People who plan to start Social Security after 65 generally need to contact Social Security to enroll in Medicare. Use Medicare’s official enrollment paths.
If you must apply, complete the application early enough for the coverage date you need. Social Security manages enrollment in Parts A and B. Apply or review enrollment instructions on SSA.gov.
Health Savings Account warning
Once a person is enrolled in Medicare, the HSA contribution limit is zero beginning with the first month of Medicare enrollment. The IRS also explains that premium-free Part A may be retroactive when someone enrolls after 65, and contributions made during retroactive Medicare coverage can become excess contributions. Read the HSA and Medicare rules in IRS Publication 969.
Because HSA timing can depend on an individual’s enrollment and tax circumstances, confirm the stopping date with the benefits administrator and a qualified tax professional before contributing.
Two months before: compare coverage paths
People with both Part A and Part B can generally choose Original Medicare or a Medicare Advantage plan available in their service area. Original Medicare does not include routine outpatient prescription drug coverage, so many people add a separate Part D plan. Medigap policies work with Original Medicare and have their own enrollment protections and timing. Compare the official coverage options on Medicare.gov.
Before joining a plan, confirm each prescription in the current formulary, each provider in the plan’s current directory, pharmacy network status, prior-authorization rules, expected annual costs, and travel needs. Plan details can change each year.
One month before: verify effective dates
When enrollment occurs before the birthday month, coverage generally starts the first day of the birthday month. If the birthday is on the first day of the month, coverage generally starts the first day of the previous month. When a person enrolls during the birthday month or one of the next three months, coverage starts the following month. Check Medicare’s coverage-start table.
If you keep working after 65
A person may qualify for an eight-month Special Enrollment Period for Part B after employment or qualifying group coverage based on current employment ends, whichever happens first. Medicare states that COBRA is not considered active-employment group coverage for this rule. Review the official Special Enrollment Period explanation.
Do not assume that delaying Medicare is safe merely because some coverage continues. Ask the employer and Medicare how that specific coverage coordinates with Medicare.
Printable turning-65 checklist
- ☐ Confirm the seven-month Initial Enrollment Period dates.
- ☐ Determine whether enrollment is automatic.
- ☐ Obtain written coordination information from the employer plan.
- ☐ Review HSA contributions and possible retroactive Part A coverage.
- ☐ List prescriptions, pharmacies, doctors and hospitals.
- ☐ Compare total annual cost, not premium alone.
- ☐ Verify provider networks and drug formularies directly.
- ☐ Check Medigap enrollment rights before delaying Part B.
- ☐ Confirm effective dates before ending existing coverage.
- ☐ Keep copies of applications, notices and plan documents.
This checklist provides general information. Medicare eligibility and enrollment can differ for disability, End-Stage Renal Disease, ALS, residence outside the United States and other circumstances. Use the Medicare.gov questionnaire or contact Social Security for an individualized enrollment answer.
