Complete guide to Medicare eligibility in 2026. Age 65+, disability pathways, ESRD, enrollment periods, and Medicare Savings Programs explained. In order to enroll in a Medicare Advantage plan, you must first be enrolled in Original Medicare (Part A and Part B) and you must have a qualifying enrollment period. Learn more about Medicare Advantage plan eligibility and when you can apply for a plan. Turning 65? Learn when to enroll in Medicare, what Part A, Part B, Part D, Medigap and Medicare Advantage cover, 2026 costs, deadlines, penalties and how to choose coverage. Getty Images Understanding the Medicare enrollment timeline and the basics of each Medicare part ensures you enroll in the right healthcare coverage at age 65 without triggering late fees. How to sign up for Medicare when turning 65 — automatic vs. manual enrollment, when to apply, and choosing coverage. Real advice from licensed agents. People with disabilities under 65 already on Medicare don't reenroll at 65, but can adjust plans. For End-Stage Renal Disease, contact Social Security for specific timing. Low-income options like Medicare Savings Programs help with premiums during signup. If you're 65 or older, you can enroll online for Parts A and B, or Part A only. You can delay Part B if you're already covered through an employer group health plan. When to sign up for Medicare Most people sign up for Part A (hospital insurance) and Part B (medical insurance) when they're first eligible, typically at age 65. It's important to sign up promptly to avoid gaps in coverage or late enrollment penalties. To enroll in a Medicare Advantage plan, you must meet specific eligibility requirements related to Medicare enrollment, residency, and plan availability. You do not need to enroll in Medicare if you receive retirement benefits from Social Security or the RRB. You will be automatically enrolled on or near your 65th birthday.