Medicare is the federal health insurance program for people 65 or older, people younger than age 65 with certain disabilities, and people of all ages with end-stage renal disease (ESRD: permanent kidney failure requiring dialysis or a kidney transplant). Original Medicare has two parts: Medicare Part A (hospital insurance) helps cover inpatient hospital care, hospice care, some home health care and up to 100 days in a skilled nursing facility when certain conditions are met; Medicare Part B (medical insurance) covers doctor visits and services, surgery, outpatient care, medical supplies and equipment, mental health services, physical and occupational therapy, and preventive services, including physical exams, screenings and flu shots.