If you’re disabled, you can qualify for Medicare before age 65 through Social Security Disability Insurance benefits, but timing varies by condition. Most disabilities require a 24-month waiting period after SSDI approval before Medicare coverage begins. However, two conditions have special rules. If you have ALS, you receive Medicare immediately upon SSDI approval with no waiting period. For End-Stage Renal Disease, you can qualify for Medicare regardless of age or disability status if you need regular dialysis or a kidney transplant, with coverage typically starting the fourth month of dialysis or the month of transplant. After your waiting period ends, you’re automatically enrolled in Medicare Part A and Part B and will receive your Medicare card by mail. In some cases, Medicare may begin sooner if Social Security determines your disability started before your application date. Since eligibility rules can be complex and vary by individual circumstances, consulting with an experienced Medicare agent can help ensure you understand all available options and timing for your specific situation.