By Christian BrinkleyLicensed NC Insurance Agent, NPN 22217190, NC Life & Health · Updated October 14, 2026 · 4 min read
Medicare is not only for people 65 and older. If you are under 65, you can still qualify through three paths: long-term disability, end-stage renal disease, or ALS. Each path has its own rules, its own waiting period, and its own exceptions. If any of these apply to you or someone you love, the details below matter. Timing mistakes can leave gaps in coverage.
The Disability Path: SSDI and the 24-Month Wait
The most common way to get Medicare under 65 is through Social Security Disability Insurance, known as SSDI. If the Social Security Administration approves you for SSDI, you become eligible for Medicare. But not right away.
There is a 24-month waiting period. The clock starts with your first month of SSDI entitlement, not the month you applied or the month you were approved. After 24 months of SSDI entitlement, Medicare kicks in automatically. You will be enrolled in Part A and Part B without having to apply separately.
This waiting period is one of the hardest parts of the disability system. You are approved as disabled, you are receiving SSDI, and you still wait two years for health coverage. Many people bridge the gap with Medicaid, COBRA from a former employer, or a spouse's plan.
A few things to know about the disability path:
ESRD: End-Stage Renal Disease
End-stage renal disease, which is permanent kidney failure requiring dialysis or a transplant, qualifies you for Medicare at any age. This includes children. There is no 24-month waiting period like the disability path, but there is a shorter one.
Medicare coverage generally begins on the first day of the third month after the month your dialysis starts. So if you start dialysis in January, coverage typically begins April 1. That leaves a gap of about two to three months.
There are two big exceptions that can eliminate the wait:
If you start a home dialysis training program, Medicare can begin the first month your dialysis starts. Home dialysis patients get faster coverage.
ALS: The Exception With No Wait
ALS, amyotrophic lateral sclerosis, also called Lou Gehrig's disease, is the exception to the waiting period. If you are approved for SSDI based on ALS, Medicare begins the first month you are entitled to SSDI. No 24-month wait.
Congress removed the waiting period for ALS because the disease moves fast. Making someone with ALS wait two years for health coverage made no sense. The change reflects that reality.
You still have to be approved for SSDI first. The SSDI application and approval process takes time on its own. But once entitlement begins, Medicare follows immediately.
Enrollment: What Happens Automatically and What Does Not
If you qualify through SSDI, including ALS, enrollment in Part A and Part B is automatic when your waiting period ends. You will get your Medicare card in the mail. You do not need to apply.
For ESRD, enrollment is not always automatic. You may need to apply at your local Social Security office or online. Do not assume it happened. Confirm your enrollment and your start date.
Part D prescription drug coverage is never automatic. You have to choose and enroll in a Part D plan yourself. If you do not enroll when first eligible and you lack other creditable drug coverage, late enrollment penalties can apply later.
The Bottom Line
Medicare under 65 comes through three doors: SSDI with a 24-month wait, ESRD with a short wait and major exceptions for home dialysis and transplant, and ALS with no wait at all. Know which door is yours, mind the enrollment details, and get help with the parts that are not automatic.
This article is for general information only and is not legal, tax, or insurance advice. Medicare rules for disability, ESRD, and ALS are detailed and change over time. For free, unbiased help, contact your State Health Insurance Assistance Program (SHIP), call 1-800-MEDICARE, or talk with a local licensed insurance agent who can review your specific situation.
Questions people ask me about this
What is the disability path: SSDI and the 24-Month wait?
The most common way to get Medicare under 65 is through Social Security Disability Insurance, known as SSDI. If the Social Security Administration approves you for SSDI, you become eligible for Medicare. But not right away. There is a 24-month waiting period.
What should I know about ESRD?
End-stage renal disease, which is permanent kidney failure requiring dialysis or a transplant, qualifies you for Medicare at any age. This includes children. There is no 24-month waiting period like the disability path, but there is a shorter one.
What should I know about ALS?
ALS, amyotrophic lateral sclerosis, also called Lou Gehrig's disease, is the exception to the waiting period. If you are approved for SSDI based on ALS, Medicare begins the first month you are entitled to SSDI. No 24-month wait. Congress removed the waiting period for ALS because the disease moves fast.
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