How to Sign Up for Medicare in Idaho

Where to Start: The Three Main Routes in Idaho

You can sign up for Medicare through three channels in Idaho: online at Medicare.gov, by phone with Social Security, or in person at a local Social Security office. The online route is fastest if you have your Social Security number and birth certificate information handy. The phone number for Social Security is 1-800-772-1213 (TTY 1-800-325-0778), and they can walk you through the entire process in one call.

Idaho does not have a separate state Medicare office—all enrollment goes through federal Social Security channels. Your local Social Security office is in Boise, Pocatello, or Idaho Falls, depending on where you live. You can find the exact address and hours at ssa.gov/locator.

Key Takeaways

You can sign up online at Medicare.gov, by phone at 1-800-772-1213, or in person at your local Social Security office in Boise, Pocatello, or Idaho Falls.
Sign up three months before the month you turn 65, during your birthday month, or within three months after—missing this window may mean a permanent penalty on your premiums.
You will need your Social Security number, birth certificate, proof of citizenship or legal residency, and information about any current health coverage.
Medicare Part A (hospital insurance) is usually free if you or your spouse paid Medicare taxes for at least 10 years; Part B (doctor visits) costs a monthly premium that varies by income.
Idaho has no state-specific Medicare programs, but you can compare private Medicare Advantage and Medigap plans through Medicare.gov or call 1-800-MEDICARE for help.

Timing: When to Sign Up and What Happens If You Miss the Window

The best time to sign up is during your Initial Enrollment Period, which runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after. If you sign up during this window, your coverage starts the first day of the month you turn 65 (or the first day of the following month if you sign up in your birthday month itself).

If you miss this window and do not have other health coverage like an employer plan or TRICARE, you will face a late enrollment penalty. This penalty is permanent—it stays on your Part B premium for as long as you have Medicare. The penalty is 10 percent of the standard Part B premium for each full 12-month period you were may be able to access but did not sign up. For example, if you turn 65 in January 2024 but do not sign up until March 2025, you owe a penalty for 14 months. There is no way to remove this penalty once it is applied.

The one exception is if you had creditable coverage—health insurance through an employer, union, or government program—when you turned 65. If you did, you have eight months after that coverage ends to sign up without penalty. Bring proof of that coverage when you enroll.

Documents You Need Before You Start

Gather these documents before you call Social Security or go online:

Your Social Security number
Your birth certificate (or a copy certified by the issuing agency)
Proof of U.S. citizenship or legal residency—a passport, naturalization certificate, or permanent resident card
Your driver's license or state ID
Information about any current health coverage (employer plan, TRICARE, VA benefits, or Medicaid)

If you are signing up online at Medicare.gov, you can upload images of these documents or enter the information directly. If you are calling or visiting in person, have them ready to read aloud or show to the representative. If you do not have a birth certificate, Social Security can help you order one—ask during your call.

Understanding Part A and Part B: What You Pay and What You Get

Part A covers hospital stays, skilled nursing care, hospice, and some home health services. Most people do not pay a monthly premium for Part A if they or their spouse paid Medicare taxes for at least 10 years. If you do not meet that requirement, you can still buy Part A, but the premium varies—ask Social Security for the current amount when you call.

Part B covers doctor visits, outpatient care, lab tests, and preventive services. Part B has a monthly premium that changes each year. In 2024, the standard premium is $164.90 per month, but it is higher if your income is above a certain threshold. If you are on Social Security, the premium is usually deducted automatically from your check. If you are not yet receiving Social Security, you will get a bill each month.

You do not have to take Part B when you turn 65 if you still have health coverage through an employer or union. But if you delay Part B after your Initial Enrollment Period ends, you will pay a 10 percent penalty for each year you waited—the same as Part A. The exception is if your employer coverage is active (meaning you or your spouse is still working there).

Choosing Between Original Medicare and Medicare Advantage Plans

Once you are enrolled in Part A and Part B, you have a choice: stay with Original Medicare (Parts A and B) or switch to a Medicare Advantage plan (Part C). This choice happens during your Initial Enrollment Period or during the annual open enrollment period (October 15 to December 7 each year).

Original Medicare is run by the federal government and accepted by most doctors and hospitals nationwide. You pay the Part B premium plus a deductible when you use services. Many people add a Medigap policy (supplemental insurance) to cover costs Original Medicare does not pay. Medigap plans are sold by private insurers and vary in price and coverage.

Medicare Advantage plans are run by private insurers and usually have lower or zero premiums than Original Medicare. But they typically limit you to a network of doctors and hospitals, and they often require referrals to see specialists. They may also include dental, vision, or hearing coverage that Original Medicare does not. The trade-off is less flexibility and potentially higher out-of-pocket costs if you use out-of-network providers.

You can compare all available plans in your area at Medicare.gov. Enter your zip code, and the site will show you every Original Medicare option, Medigap plan, and Medicare Advantage plan available to you. You can also call 1-800-MEDICARE (1-800-633-4227) and speak to someone who can walk you through the options.

What Happens After You Sign Up

After you submit your enrollment, Social Security will send you a confirmation letter in the mail. Your Medicare card will arrive separately, usually within two to four weeks. Do not throw away the envelope—it contains your Medicare number, which you will need to give to doctors and hospitals.

Your coverage starts on the first day of the month you turn 65 (or the first day of the following month if you sign up in your birthday month). Before that date, you can start using your Medicare number at any provider who accepts Medicare. If you chose a Medicare Advantage plan, your coverage starts on the first day of the month after Social Security approves your enrollment.

If you do not receive your card within four weeks, call Social Security at 1-800-772-1213 to request a replacement. Keep your card in a safe place—you will need it every time you see a doctor or use a hospital in Idaho or anywhere else in the United States.

Frequently Asked Questions

Can I sign up for Medicare before I turn 65?

Yes. You can sign up three months before your 65th birthday. For example, if you turn 65 in June, you can sign up starting in March. This is the best time to sign up because your coverage will start on the first day of the month you turn 65, with no gap.

What if I am still working and have employer health insurance?

You can delay Part B without penalty as long as your employer coverage is active and you or your spouse is still working there. When you or your spouse stops working, you have eight months to sign up for Part B without penalty. Bring proof of your employer coverage (a letter from your HR department or your insurance card) when you enroll.

Do I have to sign up for Part D (prescription drug coverage) at the same time?

Part D is optional and separate from Part A and Part B. You can sign up for it during your Initial Enrollment Period or during the annual open enrollment period. If you do not sign up when you first become may be able to access and you do not have other creditable drug coverage, you will pay a penalty when you do sign up. Talk to Social Security about whether Part D makes sense for your medications.

What if I am on Medicaid in Idaho?

You can have both Medicare and Medicaid at the same time. When you sign up for Medicare, tell Social Security that you are on Medicaid. Idaho's Medicaid program (called Medicaid) will coordinate with Medicare to cover costs that Medicare does not pay. You do not need to do anything extra—the two programs will work together automatically.

Can I change my mind after I sign up?

Yes, but only during certain windows. You have a seven-day period after you receive your Medicare card to cancel and go back to your previous coverage. After that, you can only change plans during the annual open enrollment period (October 15 to December 7) or if you have a may have access to life event like moving out of state or losing employer coverage.

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.