If you’re approaching age 65 or receiving disability benefits, you might be wondering how to sign up and apply for Medicare without missing out on important coverage.
In this guide, we will walk you through the Medicare enrollment process, explain key terms like Medicare premiums, and help you compare plans so you can make the best decision for your healthcare needs.
What Is Medicare and How Does It Work?
Medicare is a federal health insurance program managed by the Centers for Medicare & Medicaid Services (CMS). It primarily serves:
- People aged 65 and older
- Individuals under 65 with certain disabilities
- Those with End-Stage Renal Disease (ESRD) or ALS (Lou Gehrig’s Disease)
Unlike private insurance, Medicare is funded through Social Security payroll taxes, premiums, and general federal revenues. If you or your spouse worked and paid Medicare taxes for at least 10 years, you may qualify for premium-free Part A (hospital insurance).
Medicare Parts and Coverage
Medicare is divided into four parts, each offering different health insurance coverage:
Medicare Part A (Hospital Insurance)
Medicare Part A, or hospital insurance, covers:
- Inpatient hospital stays
- Skilled nursing facilities
- Hospice care
- Some home healthcare
Most people don’t pay a premium for Part A if they or their spouse paid into Social Security for 10+ years.
Medicare Part B (Medical Insurance)
Medicare Part B covers:
- Doctor visits
- Outpatient care
- Preventive services
- Durable medical equipment
Medicare premiums for Part B are income-based.
Medicare Part C (Medicare Advantage Plans)
Medicare Part C, also known as Medicare Advantage, is offered by private insurance companies approved by Medicare. These plans provide Medicare-covered Part A and Part B benefits through a private plan, and many plans also include prescription drug coverage (Part D).
To enroll in a Medicare Advantage plan, you must be enrolled in both Medicare Part A and Part B.
Medicare Part D (Prescription Drug Coverage)
Helps cover the cost of:
- Prescription medications
- Vaccines
- Some chemotherapy drugs
Part D plans are optional and offered through private insurers. Costs vary by plan, including monthly premiums, deductibles, and copayments.
Medicare Eligibility
Knowing who is eligible for Medicare is important for ensuring timely enrollment.
Age-Based Eligibility
You may be eligible to enroll in Medicare based on factors such as age, residency status, and work history. Many individuals become eligible at age 65 if they are U.S. citizens or permanent residents, and eligibility for premium-free Medicare Part A is often based on having worked and paid Medicare taxes for a sufficient period of time. In many cases, you can apply for Medicare beginning three months before the month you turn 65. Enrolling during your Initial Enrollment Period may help you avoid delays in coverage and, in some situations, late enrollment penalties.
Disability-Based Eligibility
If you’re under 65, you may still qualify for Medicare disability benefits if:
- You’ve received Social Security Disability benefits or Railroad Retirement Board disability benefits for at least 24 months
- You are diagnosed with ESRD or ALS
In these cases, you are typically automatically enrolled in Medicare Parts A and B.
Medicare Enrollment: When and How to Apply
- Initial Enrollment Period (IEP): Your Initial Enrollment Period (IEP) is a seven-month window that generally begins three months before the month you turn 65, includes your birthday month, and continues for three months after. If your birthday falls on the first day of the month, Medicare typically treats you as if you were born in the previous month, so your IEP may begin one month earlier than usual. Enrolling during this period may help you avoid delays in coverage and, in some situations, late enrollment penalties.
- General Enrollment Period (GEP): If you missed your IEP, you can still enroll during the GEP. This period runs from January 1st to March 31st annually, with coverage beginning on July 1st. Failing to enroll during the GEP may result in late enrollment penalties.
- Special Enrollment Period (SEP): You may qualify for an SEP if you’re covered by an employer group health plan, you lose employer medical insurance coverage, you move to a new service area, or you qualify for another life event. You typically have eight months to enroll in Medicare after your employer medical insurance ends.
Medicare Enrollment for Active Duty Service Members and Veterans
If you’re an active duty service member or a military retiree, enrolling in Medicare can affect your TRICARE or VA benefits. Here’s what you need to know:
TRICARE-Eligible Military Retirees
Once you become eligible for Medicare at age 65, you generally need to be enrolled in both Medicare Part A and Part B to use TRICARE For Life (TFL). In this arrangement, Medicare typically pays first, and TRICARE For Life acts as secondary coverage, which may help reduce certain out-of-pocket costs such as copayments and deductibles.
If you do not enroll in Medicare Part B when required, your TRICARE For Life coverage may be suspended, and you may be responsible for a greater share of your healthcare costs until Part B coverage is in place.
Active Duty Service Members
If you’re still serving and covered by TRICARE Prime, you are not required to enroll in Part B until you retire. However, once you leave active duty, you typically must enroll in Medicare Part B to maintain full access to TRICARE for Life.
Enroll during your Special Enrollment Period (SEP) triggered by leaving active duty or losing group coverage.
Veterans and VA Healthcare
Enrollment in Medicare does not replace VA benefits. However, the VA encourages eligible veterans to enroll in Medicare Part A and Part B to gain access to a wider range of non-VA providers.
Having both Medicare and VA benefits gives you the flexibility to receive care outside the VA system, which can be helpful if VA facilities are limited in your area.
Required Documents for Active Duty Service Members and Veterans
To enroll in Medicare, you may be asked to provide:
- Proof of military service
- Discharge documents
- Your current TRICARE or VA ID
Key Tip: If you’re turning 65 or retiring soon, enroll in Medicare before your military retirement date to avoid disruptions in your healthcare coverage. Doing so ensures TRICARE for Life or VA coordination starts seamlessly.
Medicare Enrollment for People with Employer Coverage
Many people delay retirement past age 65 and continue receiving employer-sponsored health insurance. If this applies to you, it’s important to understand how Medicare interacts with your current plan.
Do You Need to Enroll in Medicare If You’re Still Working?
When you have both employer insurance and Medicare, understanding who pays first is essential.
If Your Employer Has 20+ Employees:
- Your group health plan is considered the primary payer.
- You can delay enrolling in Medicare Part B without penalty.
- You should still enroll in Part A (hospital insurance), since it’s usually premium-free – just be aware of HSA regulations when doing so.
If Your Employer Has Fewer Than 20 Employees:
- Medicare becomes the primary payer, and your employer coverage is secondary.
- You must enroll in Medicare Parts A and B to avoid coverage gaps.
If your group coverage ends because of retirement, a job change, or company downsizing, you are immediately qualified for a Special Enrollment Period (SEP). During this period, you have eight months to enroll in Medicare Part B without penalty. If you delay enrolling past that period, you may be subject to a lifetime late enrollment penalty.
COBRA and Medicare
COBRA allows you to temporarily keep your employer’s health plan after leaving your job, but Medicare is considered your primary coverage once you’re eligible.
COBRA is not considered creditable coverage for delaying Medicare Part B, so make sure to enroll in Medicare even if you’re on COBRA.
Medicare Costs: Premiums, Deductibles & Savings Options
Medicare premiums vary depending on which plan you are enrolled in:
- Part A: Usually free if you’ve worked 10+ years
- Part B: Monthly premium based on income
- Part C and Part D: Premiums vary by plan and provider
In addition to premiums, consider deductibles, coinsurance, and out-of-pocket maximums when comparing plans.
Medicare Savings Programs (MSPs)
If you’re concerned about affording Medicare, MSPs can help. These state-run programs assist with Part A and Part B premiums, deductibles, and coinsurance for individuals with limited income and assets.
MSP eligibility depends on income and asset limits set by your state.
Extra Help Program
If you qualify for Extra Help, you may reduce your prescription drug costs.
The Extra Help program lowers costs related to Medicare Part D, such as premiums, deductibles, and co-pays. It’s available to those who meet income and resource limits and can provide financial relief for prescription drug expenses.
Medicare Card and Benefits
Once enrolled, you’ll receive a Medicare card by mail. This card proves your Medicare coverage and should be presented when receiving medical services. If you sign up for a Medicare Advantage plan, you’ll receive a separate card from the private insurer.
How to Sign Up for Medicare: Step-by-Step
Still wondering how to sign up for Medicare? The application form may seem daunting, but we have some tips and tricks to help you navigate it. Here are your options:
- Apply Online: Visit the Social Security website and fill out the online form. This is the fastest and most convenient method.
- Apply by Phone: Call Social Security at 1-800-772-1213.
- Apply In Person: Visit your local Social Security office to apply in person. Appointments are recommended to avoid long wait times.
What to Expect After Applying for Medicare
Once you’ve completed your Medicare application, here’s what to expect:
- A confirmation letter from Social Security or Medicare
- Your Medicare card in the mail within 30 days
- Access to benefits starting on the 1st of your coverage month
Be sure to carry your card to appointments or when filling prescriptions.
Final Tips for Medicare Enrollment
- Enroll early to avoid gaps in coverage or late penalties.
- Compare plans each year during open enrollment (October 15th to December 7th).
- Consider your health needs, prescriptions, and preferred doctors when choosing a plan.
- Apply for Medicare Savings Programs or Extra Help if you qualify.
- Ask questions and consult with a license agent if needed if needed.