United States · Medicare · Eligibility
Medicare eligibility calculator.
Four paths lead to Medicare: turning 65, 24 months of Social Security disability benefits, ALS, and end-stage renal disease. Pick yours, enter the date that drives it, and see the month coverage can begin and the window for signing up, using the rules published on Medicare.gov.
Short answer: You become eligible for Medicare the month you turn 65. The Initial Enrollment Period lasts 7 months, from 3 months before that month to 3 months after it, and premium-free Part A starts on the first of your birthday month, or the month before if you were born on the first. Under 65, Medicare starts automatically after 24 months of Social Security disability benefits, the same month benefits begin with ALS, and usually on the first day of the fourth month of dialysis with ESRD.
Find your Medicare start month
Result
Press Show dates to see when coverage can start and your sign-up window.
Turning 65
Medicare is health insurance for people 65 or older who meet citizenship or residency requirements. The Initial Enrollment Period runs for 7 months: it starts 3 months before the month you turn 65 and ends 3 months after that month. Coverage always starts on the first of a month. Premium-free Part A begins the month you turn 65; if your birthday is on the first of the month, it begins the month before. For Part B (and Part A if you have to pay for it), signing up in the 3 months before your birthday month starts coverage in the birthday month, while signing up in the birthday month or the 3 months after starts coverage the month after you sign up.
| When you sign up for Part B | Coverage starts |
|---|---|
| Any of the 3 months before the month you turn 65 | The month you turn 65 |
| The month you turn 65 | The next month |
| Any of the 3 months after the month you turn 65 | The month after you sign up |
Medicare.gov says some people get Medicare automatically and others have to sign up, and to start the sign-up path at least 4 months before turning 65. Whether Part A is premium-free depends on work history; the quarters-of-coverage page covers that test.
Under 65 with a disability
If you get Social Security disability benefits, Medicare.gov says you get Medicare automatically after getting disability benefits for 24 months, or when you turn 65, whichever comes first, and that the welcome package with your card is mailed 3 months before coverage starts. Benefits that began in June 2025 therefore bring Medicare in June 2027. The SSDI payment calculator on this site dates the 24 months from the first month of entitlement, which follows the five-month waiting period.
ALS
With amyotrophic lateral sclerosis you get Medicare automatically the same month that you start to get Social Security disability benefits. There is no 24-month wait and, for ALS claims filed on or after July 23, 2020, no five-month waiting period for the benefits themselves.
End-stage renal disease
For permanent kidney failure that needs a regular course of dialysis or a transplant, Medicare coverage usually starts on the first day of the fourth month of dialysis, and that waiting time counts even if you have not enrolled. It can begin as early as the first month of dialysis if you complete home dialysis training during the first 3 months, are expected to finish training and dialyze at home, and keep up a regular course of dialysis. For a kidney transplant, coverage can begin in the month you are admitted to a Medicare-certified hospital for the transplant or pre-transplant care if the transplant happens that month or within the next 2 months, and 2 months before the transplant month if it is delayed. If you have an employer or union group health plan, that plan pays first during a 30-month coordination period. Coverage based only on ESRD ends 12 months after the month dialysis stops or 36 months after the month of a transplant.
Worked example
Born November 15, 1961: you turn 65 in November 2026, the Initial Enrollment Period runs August 2026 through February 2027, and premium-free Part A starts November 2026. Born November 1, 1961 instead: Part A starts October 2026, the month before the birthday month. Dialysis that began September 10, 2026 brings ESRD Medicare on December 2026 1, or September 2026 with home dialysis training.
Method
The age-65 path adds 65 years to the birth date, builds the 7-month window around the birthday month and moves Part A one month earlier for first-of-month birthdays. The disability path adds 24 months to the first benefit month. The ALS path returns the benefit start month. The ESRD path adds three months to the first dialysis month for the regular rule. All rules were read from Medicare.gov on November 11, 2026.
What this does not cover
- Premiums, the Part A buy-in for people without enough work credits, and income-related Part B adjustments.
- Special Enrollment Periods for people with employer coverage, and late enrollment penalties, which have their own calculator.
- Railroad Retirement Board disability benefits, Medicare Advantage and Part D enrollment windows.
Figures read from the sources below on November 11, 2026. Last updated November 11, 2026.
Sources
- Medicare.gov: When does Medicare coverage start (Initial Enrollment Period and first-of-month rule) (retrieved November 11, 2026)
- Medicare.gov: Other paths to Medicare (disability after 24 months, ALS) (retrieved November 11, 2026)
- Medicare.gov: Medicare and End-Stage Renal Disease (dialysis, transplant, 30-month coordination period) (retrieved November 11, 2026)
- 20 CFR 404.315 (2025 edition): no five-month waiting period for ALS claims approved on or after July 23, 2020 (retrieved November 11, 2026)
Common mix-ups
-
Often assumedMedicare coverage begins on your 65th birthday.
What the source saysMedicare.gov says coverage always starts on the first of the month, in the month you turn 65, and the month before when your birthday falls on the first. [1]
-
Often assumedSigning up any time in the 7-month Initial Enrollment Period gives the same start date.
What the source saysMedicare.gov states that Part B signed up for in the birthday month or the 3 months after starts the month after you sign up, while signing up in the 3 months before starts it in the birthday month. [1]
-
Often assumedEveryone with ALS waits 24 months for Medicare like other disability beneficiaries.
What the source saysMedicare.gov says people with ALS get Medicare automatically the same month they start to get Social Security disability benefits. [2]
-
Often assumedDialysis patients are covered by Medicare from the first treatment.
What the source saysMedicare.gov says coverage usually starts on the first day of the fourth month of dialysis, with an exception for home dialysis training completed in the first 3 months. [3]
- Medicare.gov: When does Medicare coverage start
- Medicare.gov: Other paths to Medicare
- Medicare.gov: Medicare and End-Stage Renal Disease
Checked against these sources on .
Frequently asked questions
At what age am I eligible for Medicare?
65, if you meet the citizenship or residency requirements. You can enroll during the 7-month Initial Enrollment Period that starts 3 months before the month you turn 65.
When does Part A start if I was born on the first of the month?
The month before you turn 65. Medicare.gov states that coverage starts the month before you turn 65 when your birthday is on the first of the month.
When does Part B start if I sign up during my birthday month?
The next month. Signing up in the month you turn 65 or any of the 3 months after starts coverage the month after you sign up.
When do I get Medicare on SSDI?
Automatically after 24 months of Social Security disability benefits, or when you turn 65 if that comes first. Your card is mailed about 3 months before coverage starts.
Is there a waiting period for ALS?
No 24-month wait: with ALS, Medicare starts the same month your Social Security disability benefits start.
When does Medicare start for dialysis patients?
Usually on the first day of the fourth month of dialysis. With home dialysis training in the first 3 months it can start in the first month of dialysis.
Can Medicare start before a kidney transplant?
Yes. Coverage can begin in the month you are admitted for the transplant or pre-transplant care if the transplant happens that month or within 2 months, and 2 months before the transplant month if it is delayed.
Does ESRD Medicare end?
If Medicare is based only on permanent kidney failure, it ends 12 months after the month dialysis stops or 36 months after the month of a transplant, and resumes if dialysis restarts or you have another transplant.
Not legal, billing or medical advice
This page is general information from an unofficial guide, not legal, insurance or medical advice. Rules come from Medicare.gov on the date shown and have exceptions; confirm your own dates with Social Security or Medicare before making coverage decisions. Nothing you type is sent anywhere. It runs in your browser.