When it comes to Medicare there are two main forms of aid—Medicaid and Low Income Subsidy (LIS). Both programs are income-based programs run by the state but each assists a Medicare Beneficiary in different ways. Medicaid helps an individual with Medical costs (doctors, hospitals, outpatient procedures, etc.) whereas Low Income Subsidy (also called, “Extra Help”) is specifically designed to help an individual with prescription drug copays and coinsurance on his/her Part D plan.
The Medicare Strategy Center 