Part D is the government subsidized prescription drug program for senior citizens. The general requirement for eligibility is to be 65 years of age or older. While the government subsidizes the program, the individual prescription drug plans are run by private insurers. Part D beneficiaries also pay premiums, deductibles and co-pays for the drugs that they receive, just like private insurance. Independent community pharmacists are primary providers of the drugs that millions of senior citizens receive through the Part D program.