This document provides an overview of Medicare including eligibility, coverage under Parts A, B, C, and D, costs, and supplemental plans. Original Medicare has inpatient coverage under Part A but beneficiaries pay deductibles and coinsurance. Part B covers outpatient services and providers are reimbursed fee-for-service. Medicare Advantage plans provide all Medicare benefits and may offer extra benefits for a monthly premium. Part D prescription drug plans have a standard benefit design including a deductible, coverage gap, and catastrophic coverage. The document also reviews enrollment periods and offers resources for additional information.