There are four categories, or parts, of Medicare:
Part A: Medicare Part A covers hospital insurance — inpatient hospital stays, care in a skilled nursing facility, hospice care and some home health care.  Learn more about Medicare Part A
Part B: Medicare Part B covers certain medical insurance — doctors' services, outpatient care, medical supplies and preventive services.  Learn more about Medicare Part B
Parts A and B are sometimes referred to as Original Medicare, and they don’t cover everything. Services like dental work, vision exams/eye care and out-of-pocket costs, including deductibles, are not covered.
Part C: (Medicare Advantage): Medicare Part C/Medicare Advantage is a private health plan combining hospital and medical insurance, plus the potential for additional health benefits.  Find a Medicare Advantage Plan that may be right for you  Learn more about UnitedHealthcare Medicare Advantage (Part C) plans
Part D: Medicare Part D plans, offered by insurance companies approved by Medicare, add prescription drug coverage to Original Medicare and Medicare supplement insurance plans.  Find a Medicare Prescription Drug Plan that may be right for you  Learn more about UnitedHealthcare Medicare prescription drug (Part D) plans  Find a Medicare plan