According to a research study by National Bureau of Economic in 2014, Medicare Part D had direct relationship with a decrease in seniors’ admissions in hospitals by 8 percent. In effect, the hospital cost saving was approximated to be more than 1.5 billion. A recent study indicated the expansion of drug coverage under Medicare Part D and improvement in medication adherence have led to a reduction of medical expenditures by $2.6 billion annually to patients diagnosed with heart failure.