Medicare · Enrolling
What documents you need to sign up for Medicare
Last reviewed Invalid Date4 min readBy the Goodsurance editorial team Reviewed by the Goodsurance editorial team
Signing up for Medicare takes far less paperwork than most people brace for. For the majority, Social Security already has what it needs and can verify your age and citizenship electronically. This article walks through the short list of documents that actually matter, the one extra form that protects real money if you are still working, and what to do if a document has gone missing.
The short version
The short version: signing up for Medicare takes surprisingly little paperwork. Most people need proof of age, identity, and U.S. citizenship or lawful presence, and Social Security can often confirm these from its own records. If you are still working and plan to delay Part B, the one extra document that matters is proof of your current employer coverage. Everything below is the full list, plus what to do if you cannot find a document.
What you need to have ready
You need less than most people expect, and Social Security can verify much of it from its own records. The core list is short: your Social Security number, a birth certificate or other proof of your date of birth, and proof of U.S. citizenship or lawful immigration status if it is not already on file. If you were born outside the United States, a passport, certificate of naturalization, or green card answers the citizenship or status question.
A few situations add a document or two. If you are enrolling based on a current or former spouse's work record, have their Social Security number and, if relevant, your marriage certificate or divorce decree. If your name has changed, a document that shows the change, such as a marriage certificate, prevents a mismatch with Social Security's records. You generally do not need to prove income to enroll, because Medicare is not means-tested the way Medicaid is. Income affects what you pay, not whether you can sign up.
In short: a Social Security number, proof of birth date, and proof of citizenship or lawful status cover most people, with marriage or name-change records added only if they apply to you.
If you are delaying Part B while you work
The one document that protects real money is proof of active employer coverage, and it matters only if you are delaying Part B. If you keep working past 65 with coverage through an employer that has 20 or more employees, you can usually delay Part B without a penalty and enroll later through a Special Enrollment Period. When you do enroll, Social Security asks for a form your employer completes confirming that you had active group coverage the whole time.
Keep two things on hand for that moment: a letter or form from the employer or plan showing the dates you were covered, and your own record of when that coverage started and ended. COBRA and retiree coverage do not count as active employer coverage for this purpose, so they will not keep your penalty-free window open. Because the rules turn on employer size and exact dates, please contact us to discuss your options before you decide to delay.
In short: if you are delaying Part B, the document that counts is employer confirmation of active group coverage, and COBRA or retiree plans do not qualify.
How to apply, and what to do if a document is missing
Once you have the basics, applying is straightforward, and most people never have to mail an original document. You can apply online through Social Security, by phone, or in person, and in many cases Social Security verifies your birth date and citizenship electronically without asking for anything. If a document is requested, you usually provide the original or a certified copy, which is returned to you.
If you cannot find a birth certificate or citizenship document, do not let that stall you. Social Security can often accept alternative records, and it is better to start the application inside your seven-month Initial Enrollment Period than to wait until every paper is in hand. Missing the window can create a gap in coverage and a lasting penalty, while a missing document can usually be sorted out after you begin. When your employer coverage is ending, the eight-month Special Enrollment Period gives you time to enroll, but starting early keeps you from a lapse.
In short: apply online, by phone, or in person, let Social Security verify what it can, and start on time even if one document is still missing.
Common questions about IRMAA appeals
Quick answers, fast .
Tap any question to expand. Each links to a fuller standalone answer.
What documents do I need to sign up for Medicare?
Most people need a Social Security number, proof of date of birth such as a birth certificate, and proof of U.S. citizenship or lawful status. Social Security can often verify these from its records. Add a marriage certificate or name-change document only if it applies to you.
Do I need to prove my income to enroll in Medicare?
No. Medicare is not means-tested for enrollment, so you do not prove income to sign up. Income can affect what you pay, such as the higher-income IRMAA amounts, but not whether you qualify.
What if I am delaying Part B because I am still working?
You will need proof of active coverage from an employer with 20 or more employees, usually a form the employer completes, to enroll later without a penalty. COBRA and retiree coverage do not count. Please contact us to discuss your options.
References
- Apply for Medicare OnlySocial Security Administration (SSA.gov)
- Sign up for Medicare, what documents you needMedicare.gov / CMS
- Special Enrollment Period for people with employer coverageCMS.gov