When Can I Get Medicare?
Knowing when you are eligible for Medicare — and when you are required to enroll — is one of the most important things you can understand before you reach retirement age. Missing the right window can cost you money for the rest of your life. Here is everything you need to know about Medicare eligibility and enrollment timing.
Who Is Eligible for Medicare?
Medicare is available to three groups of people in the United States:
👴 Age 65 and Older
The most common path to Medicare. U.S. citizens and permanent residents who are 65 or older and have lived in the U.S. for at least five consecutive years are eligible — regardless of health status or income.
♿ Under 65 With a Disability
People who have received Social Security Disability Insurance (SSDI) benefits for 24 consecutive months automatically become eligible for Medicare — regardless of age. The 24-month clock starts from the date of your first SSDI payment.
🏥 ALS or ESRD
People diagnosed with Amyotrophic Lateral Sclerosis (ALS) become eligible for Medicare immediately upon receiving SSDI — no 24-month wait. People with End-Stage Renal Disease (ESRD) requiring dialysis or a kidney transplant are also eligible at any age.
📌 The most important rule: Medicare eligibility is based on age, disability status, or qualifying medical condition — not income, employment status, or where you live in Texas. Once you are eligible, you have defined windows to enroll — and missing those windows can result in permanent late enrollment penalties.
The Medicare Enrollment Periods — When You Can Sign Up
There are several different enrollment periods for Medicare. Which one applies to you depends on your situation — whether you are turning 65, still working, losing other coverage, or already on Medicare and wanting to make changes.
Initial Enrollment Period (IEP) — Your First Chance
The Initial Enrollment Period is the seven-month window around your 65th birthday when you first become eligible for Medicare. This is your primary opportunity to enroll in Parts A and B without a penalty — and it is the most important enrollment window most people will ever have.
The IEP runs:
- 3 months before the month you turn 65
- The month you turn 65
- 3 months after the month you turn 65
When your coverage actually starts depends on which month within the IEP you enroll. Enrolling in the three months before your birthday month gives you the smoothest transition — your coverage starts the first day of your birthday month with no gaps.
Rosa turns 65 in August 2026. Her Initial Enrollment Period runs from May 2026 through November 2026.
If she enrolls in May, June, or July — her coverage starts August 1, 2026.
If she enrolls in August — her coverage starts September 1, 2026.
If she enrolls in September — her coverage starts November 1, 2026.
If she enrolls in October or November — her coverage starts November 1, 2026.
Best move: Rosa should enroll in May, June, or July to ensure seamless coverage starting on her birthday with no gap.
Special Enrollment Period (SEP) — If You Are Still Working at 65
If you are still working at age 65 and covered by an employer health plan through your own active employment — or through a spouse’s active employment — you may be able to delay Medicare enrollment without penalty. When that employer coverage ends, you qualify for a Special Enrollment Period to sign up for Medicare.
The SEP gives you:
- Up to 8 months to enroll in Part B after your employer coverage ends or your employment ends — whichever comes first
- No late enrollment penalty — as long as you enroll within the SEP window
- The ability to keep your employer coverage as primary and delay Medicare until it makes financial sense
Important distinction: COBRA coverage, retiree health coverage, and marketplace plans do NOT qualify as the type of employer coverage that allows you to delay Medicare without penalty. Only active employment-based coverage counts.
General Enrollment Period (GEP) — If You Missed Your IEP
If you missed your Initial Enrollment Period and do not qualify for a Special Enrollment Period, you can sign up for Medicare during the General Enrollment Period — which runs from January 1 through March 31 each year. Coverage obtained during the GEP begins July 1 of that year.
The significant downside of the GEP is that enrolling here — rather than during your IEP — typically results in permanent late enrollment penalties on your Part B and Part D premiums. These penalties stay with you for as long as you have Medicare.
Annual Enrollment Period (AEP) — For People Already on Medicare
If you are already enrolled in Medicare, the Annual Enrollment Period runs from October 15 through December 7 each year. During AEP you can:
- Switch from Original Medicare to a Medicare Advantage plan
- Switch from Medicare Advantage back to Original Medicare
- Switch from one Medicare Advantage plan to another
- Join, switch, or drop a Part D prescription drug plan
Changes made during AEP take effect January 1 of the following year. This is the most important enrollment window of the year for existing Medicare beneficiaries — and reviewing your plan every year during AEP is one of the best financial habits a Medicare recipient can have.
Medicare Advantage Open Enrollment Period (OEP)
If you are enrolled in a Medicare Advantage plan and want to make a change, you have an additional window from January 1 through March 31 each year. During this period you can:
- Switch from one Medicare Advantage plan to another
- Drop your Medicare Advantage plan and return to Original Medicare — and join a standalone Part D plan
You cannot use the OEP to switch from Original Medicare to a Medicare Advantage plan — that change can only be made during AEP or a qualifying Special Enrollment Period.
Late Enrollment Penalties — What Happens If You Miss Your Window
Missing your Medicare enrollment window without qualifying coverage is one of the most costly mistakes you can make — because the penalties are permanent. They do not go away after a year or two. They stay with you for the rest of your life on Medicare.
💸 Part B Late Enrollment Penalty
If you do not sign up for Part B when you are first eligible — and you do not have qualifying employer coverage — your Part B premium increases by 10% for every 12-month period you went without coverage.
Example: If you delayed Part B by 2 years without qualifying coverage, your Part B premium is permanently 20% higher. At the 2026 standard premium of $185/month, that means you pay $222/month instead — forever.
💸 Part D Late Enrollment Penalty
If you go 63 or more consecutive days without creditable prescription drug coverage after you first become eligible for Medicare, you face a permanent Part D penalty. The penalty is 1% of the national base beneficiary premium for every month you went without coverage — added permanently to your monthly Part D premium.
Example: If you delayed Part D enrollment by 18 months, your penalty is 18% of the national base premium — added to your Part D premium every month for as long as you have Medicare.
There is no way to remove a late enrollment penalty once it is assessed — except in very limited circumstances involving incorrect information from an employer or Social Security. The only way to avoid them is to enroll on time or ensure your alternative coverage qualifies as creditable. A licensed Medicare advisor can review your situation and confirm whether your current coverage allows you to delay Medicare safely.
Special Situations — When Your Timing May Be Different
Turning 65 While Still Working
If you are 65 or older and covered by a group health plan through your own active employment at a company with 20 or more employees — or through a spouse’s active employment — you can generally delay Medicare Parts A and B without penalty. Your employer plan remains primary, and Medicare would be secondary if you enrolled. Many people in this situation choose to enroll in premium-free Part A (which costs nothing and adds a layer of hospital coverage) while delaying Part B until they retire.
Turning 65 With COBRA Coverage
COBRA coverage does not count as qualifying employer coverage for the purpose of delaying Medicare. If you lose your job and go on COBRA at age 65, you should enroll in Medicare — COBRA becomes secondary to Medicare once you are eligible, and if you miss your IEP, you may face penalties. This catches many people off guard at one of the most stressful times in their lives.
Turning 65 With a Marketplace (ACA) Plan
If you are currently covered by a health insurance plan through the ACA Marketplace, that coverage does not count as creditable coverage for the purpose of avoiding Medicare late enrollment penalties. You should enroll in Medicare during your Initial Enrollment Period even if you are satisfied with your Marketplace plan. Once you are eligible for Medicare, your Marketplace subsidies also end.
Turning 65 With VA Benefits
Veterans who receive care through the VA are not required to enroll in Medicare — VA coverage is creditable coverage for Part D purposes. However, many veterans choose to enroll in Medicare anyway, because Medicare can cover services at non-VA facilities, giving them access to a wider network of providers. Enrolling in both gives you the most flexibility.
Turning 65 With TRS Coverage
Texas Teachers Retirement System (TRS) coverage has specific Medicare coordination rules that changed significantly in recent years. If you are a retired teacher with TRS-Care coverage, your Medicare enrollment requirements and the way TRS coordinates with Medicare are critical to understand before your 65th birthday. Getting this wrong can result in gaps in coverage or unexpected costs. This is a conversation worth having with a licensed Medicare advisor well before you turn 65.
When Should You Start Planning for Medicare?
The honest answer is: earlier than most people think. Here is a reasonable timeline:
| When | What to Do |
|---|---|
| 12 months before turning 65 | Start learning about Medicare — understand Parts A, B, C, and D and what each covers. This is also the time to review your current coverage and understand how it coordinates with Medicare. |
| 6 months before turning 65 | Meet with a licensed Medicare advisor to review your specific situation — your doctors, your medications, your budget, and any special coverage you currently have. This is when you make your plan. |
| 3 months before turning 65 | Your Initial Enrollment Period opens. If you are not delaying Medicare with qualifying employer coverage, this is the ideal time to enroll — your coverage will start on your birthday with no gap. |
| Birthday month | Medicare coverage begins if you enrolled in the three months prior. Confirm your Medicare card has arrived and that any supplemental or Advantage plan coverage is active. |
| Every October 15 – December 7 | Annual Enrollment Period. Review your plan every single year — even if you plan to keep what you have. Plans change, your health changes, and better options may be available. |
Not Sure When You Need to Enroll in Medicare?
Medicare enrollment timing is one of the most consequential decisions you will make approaching retirement — and the penalties for getting it wrong are permanent. I help families across Brownsville, Harlingen, McAllen, and the entire Rio Grande Valley navigate their Medicare enrollment timeline correctly — so they never pay a penalty they did not have to. The consultation is always free, in English or Spanish.
☎ Call or text: 956-455-1313
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