Medicare insurance is a federal health insurance program primarily for people aged 65 and older, but it also covers certain younger people with disabilities and those with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant). Medicare helps with the cost of health care, but it does not cover all medical expenses or the cost of most long-term care.

Medicare is divided into several parts:

Part A (Hospital Insurance): Covers inpatient hospital stays, care in a skilled nursing facility, hospice care, and some home health care.

Part B (Medical Insurance): Covers certain doctors' services, outpatient care, medical supplies, and preventive services.

Part C (Medicare Advantage): An alternative to Original Medicare, these are private plans that combine Part A and Part B, and often Part D (prescription drug) coverage.

Part D (Prescription Drug Coverage): Covers the cost of prescription drugs and may help lower prescription drug costs and protect against higher costs in the future.

Each part of Medicare covers specific services, and there are premiums, deductibles, and co-pays that can vary.