Medicare is health insurance for people age 65 or older, under age 65 with certain disabilities and people of any age with End-Stage Renal Disease. This section will discuss the 4 parts of Medicare which include Part A, Part B, Part C and Part D.

常用的四部分：

Part A 医院 (Hospital Insurance) Part A helps cover: Inpatient care in hospitals (such as critical access hospitals, inpatient rehabilitation facilities, and long-term care hospitals) Inpatient care in a skilled nursing facility (not custodial or long term care) Hospice care services Home health care services Inpatient care in a Religious Nonmedical Health Care Institution

Part B 医生（Professional Services） Part B helps cover medically-necessary services like doctors' services, outpatient care, home health services, and other medical services. Part B also covers some preventive services. Check your Medicare card to find out if you have Part B.

Part C 优惠计划（Advantage Plans） Medicare Advantage Plans, sometimes called "Part C" or "MA Plans," are health plans offered by private companies approved by Medicare. If you join a Medicare Advantage Plan, the plan provides all your Part A (Hospital Insurance) and Part B (Medical Insurance) coverage. Medicare Advantage plans always cover emergency and urgent care. Medicare Advantage Plans must cover all the services that Original Medicare covers, except hospice care. (Original Medicare covers hospice care even if you’re in a Medicare Advantage Plan.) Medicare Advantage Plans may offer extra coverage, such as vision, hearing, dental, and/or health and wellness programs. Most plans also include Medicare prescription drug coverage. Medicare Advantage Plans must follow rules set by Medicare. However, each plan can charge different out-of-pocket costs and have different rules for how you get services (like whether you need a referral to see a specialist or if you have to go to only doctors, facilities, or suppliers that belong to the plan). You usually pay one monthly premium to the Medicare Advantage plan, in addition to your Part B premium.

Part D 处方药（Prescription Drug） Medicare prescription drug coverage (Part D) is available to everyone with Medicare. To get Medicare drug coverage, you must join a Medicare drug plan. Plans vary in cost and drugs covered. Two types of plans offer Medicare prescription drug coverage: 1.Medicare Prescription Drug Plans. These plans (sometimes called "PDPs") add drug coverage to Original Medicare, some Medicare Cost Plans, some Medicare Private Fee-for-Service (PFFS) Plans, and Medicare Medical Savings Account (MSA) Plans. 2.Medicare Advantage Plans (like an HMO or PPO) are other Medicare health plans that offer Medicare prescription drug coverage. You get all of your Part A and Part B coverage, and prescription drug coverage (Part D), through these plans. Medicare Advantage Plans with prescription drug coverage are sometimes called "MA-PDs."

请参考网站：http://www.medicare.gov/default.aspx