Medicare is not exclusively for people 65 and older. While most beneficiaries are seniors, roughly 10% of the program’s nearly 70 million enrollees are younger adults who qualify through disability, end-stage renal disease (ESRD), or ALS (Lou Gehrig’s disease). That’s about 7 million people under 65 currently covered by Medicare.
How Most People Get Medicare Before 65
The most common path to Medicare before age 65 is through Social Security Disability Insurance (SSDI). If you receive SSDI benefits, you become eligible for Medicare after a 24-month waiting period. The clock starts from your first month of disability benefit entitlement, not from when you applied or were diagnosed. After those 24 months, you’re enrolled automatically. You don’t need to submit a separate Medicare application.
If you had a previous period of disability, some or all of those earlier months can count toward the 24-month requirement. This applies if your new disability begins within 60 months of when your previous benefits ended. For disabled widows, widowers, or adults who qualified through childhood disability benefits, that window extends to 84 months. And if your current disability is the same as or directly related to a previous one, there’s no time limit at all: those earlier months always count.
ALS: No Waiting Period
ALS is the one condition where Medicare begins immediately. Since 2001, the 24-month waiting period has been waived for people diagnosed with ALS. And since 2020, the standard five-month wait for disability benefits itself has also been waived. That means your Medicare coverage starts the same month your disability benefits begin. Enrollment is automatic once you’re approved for SSDI with an ALS diagnosis.
End-Stage Renal Disease
Kidney failure that requires regular dialysis or a kidney transplant qualifies you for Medicare at any age. You don’t need to be on SSDI. You do need to meet one of these work-related requirements: you’ve worked enough to earn Social Security credits, you’re already receiving or eligible for Social Security or Railroad Retirement benefits, or you’re the spouse or dependent child of someone who meets those criteria.
The timing of coverage depends on your treatment. If you’re on dialysis, Medicare typically starts on the first day of the fourth month of treatments. You can skip that three-month wait if you train for home dialysis at a Medicare-certified facility during your first three months. If you’re getting a kidney transplant, coverage can begin the month you’re admitted to the hospital for the procedure, as long as the transplant happens within two months of admission.
What Coverage Looks Like Under 65
Once you’re on Medicare before 65, you get the same Part A (hospital coverage) and Part B (outpatient and doctor visits) as any senior. You can also enroll in Medicare Advantage plans (Part C) and Part D prescription drug plans. In practical terms, the core benefits are identical regardless of your age.
There is one significant gap, though. Supplemental insurance, known as Medigap, is harder to get if you’re under 65. Federal law does not require insurance companies to sell Medigap policies to people younger than 65. Some states have passed their own laws requiring insurers to offer these plans to younger Medicare beneficiaries, but many have not. This means you could face higher premiums, fewer plan choices, or outright denial depending on where you live. Your state insurance department can tell you what protections apply in your area. Once you turn 65, federal open enrollment protections kick in and insurers must sell you a Medigap policy regardless of health status.
How Enrollment Works
If you qualify through SSDI, enrollment is automatic. After your 24th month of receiving disability benefits (or immediately with ALS), you’ll be enrolled in Medicare Parts A and B without needing to take action. You’ll receive your Medicare card in the mail before your coverage start date.
ESRD works a bit differently. If you’re not already receiving Social Security benefits, you’ll need to contact Social Security to apply for Medicare based on your kidney failure. The application process requires documentation of your diagnosis and treatment plan.
For Part A, most people under 65 pay no monthly premium because their work history (or a family member’s) has already earned enough Social Security credits. Part B carries the same monthly premium that seniors pay, which is deducted from your disability check if you’re on SSDI.
When ESRD Coverage Ends
Medicare coverage based solely on ESRD is not permanent in all cases. If you receive a successful kidney transplant and don’t qualify for Medicare through age or disability, your coverage continues for a limited period after the transplant. This is an important distinction from disability-based or age-based Medicare, which continues as long as you remain eligible. If you’re approaching the end of your ESRD coverage window, it’s worth exploring whether you qualify through another pathway.