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A federally funded health insurance program administered by the Centers for Medicare & Medicaid Services (CMS) under the U.S. Department of Health and Human Services for people age 65 and older; for individuals with disabilities younger than age 65 who have received or been determined eligible for Social Security Disability benefits for at least 24 consecutive months; and for insured workers and their dependents who have end stage renal disease and need dialysis or a kidney transplant. As with ESRD, the 24-month waiting period is waived for disability beneficiaries diagnosed with Amyotrophic Lateral Sclerosis (ALS, also called Lou Gehrig's disease). Premiums, deductibles and co-payments or out-of-pocket costs apply to Medicare coverage for most people. Special programs that assist with paying some or all of these costs are available for low income individuals who qualify. Medicare has four parts, but not every Medicare beneficiary has every part. Medicare Part A (Hospital Insurance) covers inpatient hospital stays, care in a skilled nursing facility, hospice care and home health care that meets the program eligibility criteria. Medicare Part B (Medical Insurance) covers services from doctors and other health care providers, outpatient care, home health care, durable medical equipment, preventive services and more. Together, Medicare Part A and Part B are called Original Medicare. Medicare Part C enables private insurance companies to offer Medicare Advantage (MA) Plans under contract with CMS that provide all Part A and Part B benefits to plan enrollees. Medicare Advantage Plans include Health Maintenance Organizations, Preferred Provider Organizations, Private Fee-for-Service Plans, Special Needs Plans and Medicare Medical Savings Account Plans. Some plans offer extra benefits and services that aren't covered by Original Medicare, sometimes for an extra cost; and most (but not all) include Medicare prescription drug coverage. Medicare Part D (Medicare prescription drug coverage) is an optional benefit that helps beneficiaries cover the cost of prescription drugs. The plans are offered by insurance companies and other private companies approved by Medicare and add prescription drug coverage to Original Medicare, some Medicare Private-Fee-for-Service Plans and Medicare Medical Savings Account Plans.