Getting Medicare Without a Social Security Number

You can get Medicare without a Social Security number, but the process is slower and requires proof of citizenship or legal residency instead

Medicare does not require you to have a Social Security number to sign up. If you are a U.S. citizen or a lawful permanent resident (green card holder), you can enroll in Medicare using other forms of identification and documentation. The Social Security Administration and Centers for Medicare & Medicaid Services (CMS) will assign you a Medicare number separate from any Social Security number.

The main difference is timing and paperwork. Without a Social Security number, the enrollment process takes longer because CMS must verify your citizenship or immigration status through other channels. You will need to provide documents like a birth certificate, passport, naturalization papers, or green card instead of relying on Social Security records to confirm your identity.

Key Takeaways

You can enroll in Medicare using a birth certificate, U.S. passport, naturalization certificate, or green card if you do not have a Social Security number.
CMS will verify your citizenship or legal residency status directly, which adds two to four weeks to the normal enrollment timeline.
You will receive a separate Medicare number that is not tied to Social Security, and you can use either number to access your Medicare account.
If you are not yet a citizen or permanent resident, you may still be covered under certain Medicare rules if you are a refugee or asylee, but you will need to contact Social Security or Medicare directly to confirm.

Documents you will need to enroll without a Social Security number

Start by gathering proof of citizenship or legal residency. A U.S. birth certificate is the most straightforward option if you were born in the United States. If you were born outside the U.S., you will need either a valid U.S. passport, a Certificate of Naturalization, or a green card (Permanent Resident Card).

You will also need a photo ID — a driver's license, state ID, or passport works. Have your current address and phone number ready. If you are signing up for Medicare Part A or Part B, you may also need to provide information about any current health insurance coverage.

If your birth certificate or other citizenship document is from another country, bring the original or a certified copy. CMS will not accept photocopies of naturalization certificates or green cards, so plan to show the original document or have it certified by the issuing authority.

Where to start the enrollment process

You have three main routes: in person at a Social Security office, by phone with Medicare, or online through Medicare.gov. The in-person route at Social Security is often fastest when you do not have a Social Security number, because the staff can see your documents when ready and begin the verification process on the spot.

Call Social Security at 1-800-772-1213 (TTY 1-800-325-0778) to schedule an appointment or ask whether you can walk in. Bring all your citizenship documents and photo ID. Tell the representative that you do not have a Social Security number and want to enroll in Medicare.

If you prefer to start by phone with Medicare directly, call 1-800-MEDICARE (1-800-633-4227). Medicare staff can mail you an process form and instructions for submitting your documents. This route typically takes longer because documents must be mailed and reviewed, but it works if you cannot visit a Social Security office in person.

How long the process takes without a Social Security number

Expect the enrollment to take four to eight weeks from the time you submit your documents, compared to two to three weeks for someone with a Social Security number. The extra time comes from CMS having to verify your citizenship or residency status independently, rather than cross-checking Social Security records.

If you enroll in person at a Social Security office, the initial verification can happen faster — sometimes within two weeks — because the staff can confirm your documents on the day you explore. However, CMS still needs to process the information and issue your Medicare card, which adds another one to two weeks.

If you are approaching age 65 and do not yet have a Social Security number, start the process at least three months before your birthday. This gives you time to complete enrollment before your coverage should begin. If you miss the important date, you may face a late enrollment penalty on your Part B premium.

Your Medicare number without a Social Security number

CMS will issue you a Medicare number that is distinct from any Social Security number. This number will appear on your Medicare card and in your online Medicare account. You can use either your Medicare number or a Social Security number (if you later obtain one) to access your benefits and check your coverage.

Your Medicare number is permanent and will not change if you later get a Social Security number. If you do obtain a Social Security number after enrolling in Medicare, you can update your Social Security information with CMS, but your original Medicare number remains your primary identifier for all Medicare records.

Special situations: refugees, asylees, and other cases

If you are a refugee or asylee, you may be covered under Medicare even without a Social Security number or permanent residency status. Refugees are typically covered by Medicare Part A (hospital insurance) for the first seven years after arrival in the United States. Asylees have similar protections.

If you are in one of these categories, contact Social Security or Medicare directly to confirm your coverage and enrollment options. The rules vary depending on your specific immigration status and the date you arrived in the United States. Do not assume you are ineligible — many people in these situations can enroll.

If you are not a citizen or permanent resident and do not fall into the refugee or asylee category, you generally cannot enroll in Medicare. However, you may be covered under state Medicaid programs or other health insurance options. Contact your state Medicaid office or a local health department to explore what coverage may be available to you.

What to do if your documents are delayed or missing

If you cannot locate your birth certificate or other citizenship document, you can request a replacement from the vital records office in the state or country where you were born. This process usually takes two to four weeks. In the meantime, you can still begin the Medicare enrollment process — Social Security and CMS will hold your process while you gather the required documents.

If you are waiting for a replacement document, ask the Social Security representative or Medicare staff member to note this in your file. Provide a timeline for when you expect to receive the document, and follow up once it arrives. Do not delay — the sooner you submit your documents, the sooner your coverage can begin.

If you have a green card process pending or are in the process of becoming a citizen, you may be able to use a receipt notice or other official document from immigration authorities as temporary proof while your final documents are being processed. Ask Social Security whether your specific document will be accepted.

Frequently Asked Questions

Can I use a green card as my only proof of citizenship to enroll in Medicare?

Yes. A green card (Permanent Resident Card) is sufficient proof of legal residency and is one of the primary documents CMS accepts. You will still need a photo ID, but the green card alone establishes your may be able to access for Medicare.

What happens if I get a Social Security number after I enroll in Medicare?

Your Medicare coverage and number do not change. You can update your Social Security information with CMS through Medicare.gov or by calling 1-800-MEDICARE, but your original Medicare number remains active and is your primary identifier for all Medicare records and claims.

Will not having a Social Security number affect my Medicare premiums or coverage?

No. Your premiums and coverage are the same whether you have a Social Security number or not. The only difference is the enrollment timeline and the documents you use to prove your identity and residency status.

Can I enroll in Medicare online if I do not have a Social Security number?

Medicare.gov does not have a fully online enrollment path for people without a Social Security number. You will need to either visit a Social Security office in person or call Medicare to request a paper process. The in-person route at Social Security is usually faster.

What if I was born outside the U.S. but do not have a passport or naturalization certificate?

A birth certificate from your country of birth, along with proof of U.S. citizenship or permanent residency (such as a green card), can work. If you have none of these documents, contact Social Security to discuss what alternatives may be available. You may need to obtain certified copies from your country of origin.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.